Specifications
Bitumen-rubber insulating mastic.
Specifications
Date of introduction 1979-07-01
APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee for Construction Affairs dated December 29, 1978 No. 266 INSTEAD GOST 15836-70
REISSUE. September 1994
This standard applies to bitumen-rubber mastic, which is a multicomponent mass consisting of petroleum bitumen (or a mixture of bitumen), filler and plasticizer and intended for insulating underground steel pipelines and other structures in order to protect them from soil corrosion.
The scope of application of bitumen-rubber mastic is specified in Appendix 1 to this standard.
Mastic must be used in accordance with building codes and regulations.
1.1. Mastic must be manufactured in accordance with the requirements of this standard according to the technological regulations approved in in the prescribed manner.
1.2. Mastic, depending on the softening temperature, is divided into brands: MBR-65, MBR-75, MBR-90 and MBR-100.
1.3. To make mastic the following should be used:
As an organic binder:
Petroleum insulating bitumens according to GOST 9812-74;
Petroleum construction bitumens according to GOST 6617-76;
As a filler:
Crumb rubber obtained from shock absorbers
roved car tires on technical
conditions approved in accordance with the established procedure;
As a plasticizer and antiseptic -
green oil.
1.4. The mastic must be homogeneous, without foreign inclusions and not have filler particles not covered with bitumen.
1.5. The mastic must meet the requirements specified in table. 1.
2. Depth of needle penetration at 25°C, 0.1 mm, not less than 40 30 "20 15
3. Extensibility at 25°C, cm, not less than 4 4 3 2
4. Water saturation over 24 hours, %, no more than 0.2 0.2 0.2 0.2
2.Acceptance rules
2.1. The batch size is set in the amount of shift production, but not more than 150 tons. The batch must consist of only one brand of mastic, prepared according to the same recipe, technology and from the same components.
2.2. Acceptance control is carried out by the manufacturer according to the following indicators: softening temperature, needle penetration depth and extensibility.
2.3. The manufacturer is obliged to test the mastic for water saturation at least once a quarter, as well as with each change in the raw materials used to prepare the mastic.
2.4. The consumer has the right to carry out i-role random verification of compliance with m< ки требованиям настоящего стандарта, соблюда! этом указанный ниже порядок отбора образц применяя методы их испытаний.
2.5. To check the compliance of the mastic with the requirements of this standard, 1% is selected from each particulate, but not less than two packages (bags, barrels).
A mastic sample in an amount of at least 1 kg is taken from each bag (barrel).
A sample is taken in three places of the barrel (a bag on top, bottom and in the middle (about 0.3 kg each). All collected samples are fused, thoroughly mixed
2.6. If the result is unsatisfactory
torture of mastic according to at least one of the indicators
are re-testing this display"
double the number of samples. Results
These tests are considered final.
3. Test methods
3.1. Determination of uniformity
The uniformity of the mastic is determined by the visual!
inspection of a piece of mastic in a chip or layer applied to a strip of paper (cardboard) sized | 50x150 mm when dipping it into molten water whose temperature is 160-180°C.
Mastic is considered homogeneous if the particles of zin crumbs are evenly distributed in it (clumps and clusters.
3.2. Determination of softening temperature
3.2.1. Method of sampling and preparation for and
Sampling is carried out according to clause 2.5.
Before testing, melt a mastic sample. and, if necessary, dehydrate by carefully heating - without overheating to a temperature of 180 ° C while stirring with a glass rod
3.2.2. Equipment, accessories and reaction
Apparatus for determining temperature pa:
grades of LTR bitumen according to GOST 11506-73.
Mercury thermometer types TN-3 and TN-7 according to G 400-80.
Gas burner or electric stove with heating regulator.
Cup glass diameter not less than 9i and height not less than 115 mm.
Metal cup for melting may
Heat-resistant polished glass metal plate.
Knife with straight blade for cutting
Glycerin according to GOST 6823-77.
Talc according to GOST 19729-74.
3.2.3. Preparation for the test:
The melted and dehydrated mastic, with some excess, is poured into 2 brass rings of the device, placed on a polished metal or glass plate, lubricated with talcum powder and glycerin (1:3). For mastic with an expected softening temperature above 100°C, stepped rings are used, which are slightly heated."
After cooling the mastic in air for 30 minutes at a temperature of (20±2)°C, the excess is cut off with a heated sharp knife flush with the edges of the rings,
3.2.4. Carrying out the test:
Rings with mastic are inserted into the holes on the device suspension. A thermometer is inserted into the middle hole of the pendant so that the lower point of the mercury reservoir is flush with the lower surface of the mastic in the rings.
The prepared device is placed in a glass beaker filled with water, the temperature of which is (15 ± 0.5) ° C, and kept in it for 15 minutes. If the softening temperature of the mastic is above 80°C, then instead of water, glycerin is poured into the glass, the temperature of which is (35+0.5)°C. After 15 minutes, the pendant is removed from the glass and a steel ball is placed in the center of each ring on the surface of the mastic with tweezers, after which the pendant is lowered back into the glass.
The glass is placed on the heating device so that the plane of the rings is strictly horizontal.
The temperature of water or glycerin in the glass after the first 3 minutes of heating should rise at a rate of (5 ± 0.5) ° C per 1 minute.
For each ring and ball, note the temperature at which the mastic squeezed out by the ball touches the lower disk of the device.
3.2.5. Processing the results:
The arithmetic mean of two parallel determinations is taken as the softening temperature of the mastic.
The differences between two parallel determinations should not exceed 1°C.
3.3. Determination of needle penetration depth
3.3.1. Sampling method:
3.3.2. Equipment and accessories:
Penetrometer with needle (manual or automatic)
cue) according to GOST 1440-78.
Stopwatch according to TU 25-1819.0021-90 or TU 25-1894.003-90 when using a hand-held penetrometer.
Calibrated metal rod with a diameter of 10 mm and a height of 50 mm.
A glass or metal flat-bottomed vessel with a capacity of at least 1 liter and a height of at least 50 mm.
Metal cylindrical cup with a flat bottom, internal diameter (55±2) mm, height (35±2) mm.
Water bath.
Metal cup for melting mastic.
3.3.3. Preparation for the test:
The melted and dehydrated mastic is poured into a metal cup so that its surface is no more than 5 mm below the top edge of the cup. Then, by quickly moving a burning match over the surface of the mastic, air bubbles are removed.
The cup with mastic is cooled in air for 1 hour at a temperature of (20±2)°C, then for 1 hour in a water bath, the temperature of which is (25±0.5)°C.
3.3.4. Carrying out the test:
The cup with mastic is removed from the bath and placed in a crystallizer filled with water, the temperature of which is (25 ± 0.5) ° C. The height of the water layer above the surface of the mastic must be at least 10 mm. The crystallizer is placed on the device table and the needle tip is brought to the surface of the mastic so that the needle only lightly touches it.
The rack is brought to the top platform of the rod carrying the needle, and the arrow is set to zero or its position is noted, after which the stopwatch is simultaneously turned on and the device button is pressed, allowing the needle to freely enter the test sample for 5 s, after which the button is released.
After this, the ratchet is again brought to the upper platform of the rod with the needle and the reading of the device is noted.
The determination is repeated at least three times per various points on the surface of the mastic sample, spaced from the edges of the cup and from each other by at least 10 mm. After each dive, wipe the tip of the needle to remove any adhering mastic.
3.3.5. Processing the results:
The arithmetic mean of the results of three parallel determinations is taken as the depth of penetration of the needle, expressed in tenths of a millimeter (or numbers corresponding to degrees of the instrument scale).
The discrepancies between the results of three parallel determinations should not exceed: when the needle penetration value is from 30 to 60-2; when the needle penetration value is less than 30-1.
3.4. Determination of mastic elongation:
3.4.1. Sampling method:
Sampling is carried out according to clause 2.5.
3.4.2. Equipment, accessories and reagents:
Ductilometer with brass forms - "eight"
kami" according to GOST 11505-75.
Mercury glass thermometer according to GOST 27544-87, measured temperature range 0-50°C, scale division 0.5°C.
Knife with a straight blade for cutting mastic. Polished metal or heat-resistant glass plate. Talc according to GOST 19729-74.
Glycerin according to GOST 6823-77 or GOST 6259-75. Metal cup for melting mastic.
3.4.3. Preparation for the test:
Polished metal or glass
the plate and the inner side walls of the figure eight liners are coated with a mixture of talc and glycerin (1:3). Then the forms are assembled on a plate.
The melted and dehydrated mastic is poured with a slight excess into three brass figure-eight springform molds in a thin stream from one end of the mold to the other until it is filled above the brim.
The mastic in the mold is cooled for 30 minutes in air at a temperature of (20±2)°C, then the excess mastic is cut off with a heated sharp knife from the middle to the edges, flush with the edges of the mold, after which the molds with mastic, without removing from the plate, are kept for 1 hour in a water bath, the temperature of which is (25+0.5)°C.
3.4.4. Carrying out the test:
The molds with mastic are removed from the water, removed from the plate and fixed in a ductilometer filled with water, the temperature of which is (25 ± 0.5) ° C. The height of the water layer above the mastic must be at least 25 mm. Then take out the side parts of the mold, set the pointer to “0”, turn on the ductilometer motor and observe the stretching of the mastic.
The stretching speed should be 5 cm per minute.
3.4.5. Processing the results:
The stretchability of the mastic is taken to be the length of the mastic thread in centimeters, marked with an indicator at the moment of its breaking.
For each mastic sample, three determinations are carried out. The arithmetic mean of the results of three parallel determinations is taken as the tensile value. Discrepancies between the results should not exceed 10% of the arithmetic mean of the compared results.
3.5. Determination of water saturation of mastic - according to GOST 9812-74.
4. Labeling, packaging, transportation and storage
4.1. Mastic must be packed in barrels or
paper bags with internal coating, obstruct
preventing the mastic from sticking to the container.
By agreement with the consumer, mastic may be shipped in uncoated paper bags.
4.2. Each package must have
label attached or indelible
stamp indicating:
b) name of the manufacturing enterprise;
his address:
c) brand of mastic;
d) batch number;
e) date of manufacture of mastic;
f) designation of this standard.
4.3. The manufacturer must guarantee compliance
Compliance of bitumen-rubber mastics with the requirements of NG
current standard and accompany each pair
mastic document, which should contain the
a) name of the organization in the system
the swarm includes the manufacturer;
b) name npeflnpnflTMfl-H3roTOBHTej
his address;
c) brand of mastic;
d) batch number;
e) batch size;
f) date of manufacture of mastic;
g) test results;
h) designation of this standard.
4.4. The mastic should be stored separately indoors or under a canopy in conditions that exclude its heating and moisture.
4.5. When loading, unloading and transporting mgki, precautionary measures must be taken to ensure the safety of the mastic and containers.
Transportation of mastic must be carried out in containers, and it must be protected from exposure sun rays and atmospheric bonds.
4.6. Mastic produced directly
no proximity to construction sites, may
placed at the place of production of insulating materials
the bot in a heated form - in asphalt dispensers.
5. Safety requirements
5.1. Bitumen-rubber mastics are a gas substance with a flash point of 240-30
5.2. When producing, melting, and selecting mastics, work clothes and personal protective equipment should be used in accordance with the “Standard Standards for the free issuance of work clothes, safety shoes and safety equipment to approved State Committee SSS labor and social issues and the All-Union Central Council of Trade Unions.
5.3. When a small amount of i tiki catches fire, the fire should be extinguished with sand, felt felt, soap powders, a foam fire extinguisher, and swirling fires should be extinguished with a foam jet or water from fire trunks.
STATE STANDARD OF THE USSR UNION
BITUMEN-RUBBER INSULATING MASTIC
TECHNICAL CONDITIONS
GOST 15836-79
PUBLISHING HOUSE OF STANDARDS
Moscow
STATE STANDARD OF THE USSR UNION
By Decree of the USSR State Committee for Construction Affairs dated December 29, 1978 No. 266, the introduction date was established
from 01.07.79
1. This standard applies to bitumen-rubber mastic, which is a multicomponent mass consisting of petroleum bitumen (or a mixture of bitumens), filler and plasticizer and intended for insulating underground steel pipelines and other structures in order to protect them from soil corrosion.
The scope of application of bitumen-rubber mastic is indicated in the appendix to this standard.
The mastic must be used in accordance with building codes and rules.
1. TECHNICAL REQUIREMENTS
1.1. Mastic must be manufactured in accordance with the requirements of this standard according to technological regulations approved in the prescribed manner.
1.2. Mastic, depending on the softening temperature, is divided into brands: MBR-65, MBR-75, MBR-90 and MBR-100.
1.3. To make mastic the following should be used:
As an organic binder - petroleum insulating bitumen in accordance with GOST 9812-74 or petroleum construction bitumen in accordance with GOST 6617-76;
As a filler - crumb rubber obtained from depreciated car tires according to technical specifications approved in the prescribed manner;
Green oil is used as a plasticizer and antiseptic.
1.4. The mastic must be homogeneous, without foreign inclusions and not have filler particles not covered with bitumen.
1.5. The mastic must meet the requirements specified in the table.
|
Indicator name |
Standard for brands |
|||
|
1. Softening temperature according to the “Ring and ball” method, ° C, no less |
||||
|
2. Needle penetration depth at 25 ° C, 0.1 mm, not less |
||||
|
3. Elongation at 25 ° C, cm, no less |
||||
|
4. Water saturation in 24 hours, %, no more |
||||
2. ACCEPTANCE RULES
2.1. The batch size is set in the amount of shift production, but not more than 150 tons. The batch must consist of only one brand of mastic, prepared according to the same recipe, technology and from the same components.
2.2. Acceptance control is carried out by the manufacturer according to the following indicators: softening temperature, needle penetration depth and extensibility.
2.3. The manufacturer is obliged to test the mastic for water saturation at least once a quarter, as well as with each change in the raw materials used to prepare the mastic.
2.4. The consumer has the right to carry out a control random check of the compliance of the mastic with the requirements of this standard, while observing the procedure for selecting samples indicated below and using their test methods.
An average sample of mastic in an amount of at least 1 kg is taken from each bag (barrel). A sample is taken in three places of the barrel (bag) - top, bottom and middle (about 0.3 kg each). All selected samples are fused, thoroughly mixed.
2.6. If the test results of the mastic are unsatisfactory for at least one of the indicators, a double test is carried out for this indicator on a double number of samples. The results of repeated tests are considered final.
3. TEST METHODS
3.1.Determination of uniformity
The uniformity of the mastic is determined by visual inspection of a piece of mastic in a chip or a layer of mastic applied to a strip of paper (cardboard) measuring 50x150 mm when dipped into the molten mass, the temperature of which is 160-180 ° C.
The mastic is considered homogeneous if the particles crumb rubber distributed evenly in it without clots and accumulations.
3.2. Determination of the softening temperature of mastic
3.2.1. Method of sampling and preparing them for testing
Sampling is carried out according to...
Before testing, the mastic sample is melted and, if necessary, dehydrated by careful heating - without overheating to a temperature of 120-180 ° C while stirring with a glass rod.
3.2.2.
Apparatus for determining the softening temperature of bitumen LTR according to GOST 11506-73.
Mercury thermometer types TN-3 and TN-7 according to GOST 400-80.
Gas burner or electric stove with heating regulator.
Glass glass with a diameter of at least 90 mm and a height of at least 115 mm.
Tweezers.
Glycerin according to GOST 6823-77.
Talc according to GOST 19729-74.
3.2.3. Preparing for the test
The melted and dehydrated mastic, with some excess, is poured into 2 brass rings of the device, placed on a polished metal or glass plate, lubricated with talcum powder and glycerin (1:3). For mastic with an expected softening temperature above 100 °C, step rings are used, which are slightly heated.
After cooling the mastic in air for 30 minutes at a temperature (20± 2) °C the excess is cut off with a heated sharp knife flush with the edges of the rings.
3.2.4. Carrying out the test
Rings with mastic are inserted into the holes on the device suspension. A thermometer is inserted into the middle hole of the pendant so that the lower point of the mercury reservoir is flush with the lower surface of the mastic in the rings.
The prepared device is placed in a glass beaker filled with water, the temperature of which is (15± 0.5) °C, and kept there for 15 minutes. If the softening temperature of the mastic is above 80 °C, then instead of water, glycerin is poured into the glass, the temperature of which is (35 ± 0.5) °C. After 15 minutes, the pendant is removed from the glass and a steel ball is placed in the center of each ring on the surface of the mastic with tweezers, after which the pendant is lowered back into the glass.
The glass is placed on the heating device so that the plane of the rings is strictly horizontal.
The temperature of water or glycerin in the glass after the first 3 minutes of heating should rise at a speed of (5± 0.5) °C per 1 min.
For each ring and ball, note the temperature at which the mastic squeezed out by the ball touches the lower disk of the device.
3.2.5. Processing the results
The arithmetic mean of two parallel determinations is taken as the softening temperature of the mastic.
The differences between two parallel determinations should not exceed 1 °C.
3.3. Determination of needle penetration depth
3.3.1. Sampling method
Sampling is carried out according to...
3.3.2. Equipment and accessories
Penetrometer with a needle (manual or automatic) according to GOST 1440-78.
Stopwatch according to TU 25-1819.0021-90 or TU 25-1894.003-90 when using a hand-held penetrometer.
Calibrated metal rod with a diameter of 10 mm and a height of 50 mm.
A glass or metal flat-bottomed vessel with a capacity of at least 1 liter and a height of at least 50 mm.
Metal cylindrical cup with a flat bottom, internal diameter (55± 2) mm, height (35 ± 2) mm.
Water bath.
Metal cup for melting mastic.
3.3.3. Preparing for the test
The melted and dehydrated mastic is poured into a metal cup so that its surface is no more than 5 mm below the top edge of the cup. Then, by quickly moving a burning match over the surface of the mastic, air bubbles are removed.
The cup with mastic is cooled in air for 1 hour at a temperature (20± 2) °C, then for 1 hour - in a water bath, the temperature of which is (25± 0.5) °C.
3.3.4. Carrying out the test
The cup with mastic is removed from the bath and placed in a crystallizer filled with water, the temperature of which is (25± 0.5) °C. The height of the water layer above the surface of the mastic must be at least 10 mm. The crystallizer is placed on the device table and the needle tip is brought to the surface of the mastic so that the needle only lightly touches it.
The rack is brought to the top platform of the rod carrying the needle, and the arrow is set to zero or its position is noted, after which the stopwatch is simultaneously turned on and the device button is pressed, allowing the needle to freely enter the test sample for 5 s, after which the button is released.
After this, the ratchet is again brought to the upper platform of the rod with the needle and the reading of the device is noted.
The determination is repeated at least three times at different points on the surface of the mastic sample, spaced from the edges of the cup and from each other by at least 10 mm. After each dive, wipe the tip of the needle to remove any adhering mastic.
3.3.5. Processing the results
The arithmetic mean of the results of three parallel determinations is taken as the depth of penetration of the needle, expressed in tenths of a millimeter (or numbers corresponding to degrees of the instrument scale).
The discrepancies between the results of three parallel determinations should not exceed: when the needle penetration value is from 30 to 60-2; when the needle penetration value is less than 30-1.
3.4. Determination of the stretchability of mastic
3.4.1. Sampling method
Sampling is carried out according to...
3.4.2. Equipment, accessories and reagents
Ductilometer with brass forms - "eights" according to GOST 11505-75.
Mercury glass thermometer according to GOST 27544-87, measured temperature range 0-50 °C, scale division 0.5 °C.
Knife with a straight blade for cutting mastic.
Polished metal or heat-resistant glass plate.
Talc according to GOST 19729-74.
Glycerin according to GOST 6823-77 or GOST 6259-75.
Metal cup for melting mastic.
3.4.3. Preparing for the test
A polished metal or glass plate and the inner side walls of the figure eight liners are coated with a mixture of talc and glycerin (1:3). Then the forms are assembled on a plate.
The melted and dehydrated mastic is poured with a slight excess into three brass figure-eight springform molds in a thin stream from one end of the mold to the other until it is filled above the brim.
The mastic in the mold is cooled for 30 minutes in air at a temperature (20± 2) °C, then the excess mastic is cut off with a heated sharp knife from the middle to the edges, flush with the edges of the mold, after which the molds with mastic, without removing from the plate, are kept for 1 hour in a water bath, the temperature of which is (25± 0.5) °C.
3.4.4. Carrying out the test
The molds with mastic are removed from the water, removed from the plate and fixed in a ductilometer filled with water, the temperature of which is (25± 0.5) °C. The height of the water layer above the mastic must be at least 25 mm. Then take out the side parts of the mold, set the pointer to “0”, turn on the ductilometer motor and observe the stretching of the mastic.
The stretching speed should be 5 cm per minute.
3.4.5.Processing the results
The stretchability of the mastic is taken to be the length of the mastic thread in centimeters, marked with an indicator at the moment of its breaking.
For each mastic sample, three determinations are carried out. The arithmetic mean of the results of three parallel determinations is taken as the tensile value. Discrepancies between the results should not exceed 10% of the arithmetic mean of the compared results.
3.5. Determination of water saturation of mastic - according to GOST 9812-74.
4. LABELING, PACKAGING, TRANSPORTATION AND STORAGE
4.1. The mastic must be packaged in barrels or paper bags with an internal coating that prevents the mastic from sticking to the container.
By agreement with the consumer, mastic may be shipped in uncoated paper bags.
4.2. Each package must have a label attached or an indelible stamp indicating:
b) name of the manufacturer and its address:
c) brand of mastic;
d) batch number;
e) date of manufacture of mastic;
f) designation of this standard.
4.3. The manufacturer must guarantee compliance of bitumen-rubber mastics with the requirements of this standard and accompany each batch of mastic with a document that must indicate:
a) the name of the organization in whose system the manufacturer is included;
b) name of the manufacturer and its address;
c) brand of mastic;
d) batch number;
e) batch size;
f) date of manufacture of mastic;
g) test results;
h) designation of this standard.
4.4. Mastic should be stored separately by brand indoors or under a canopy under conditions that exclude its heating and moisture.
4.5. When loading, unloading and transporting mastic, precautions must be taken to ensure the safety of the mastic and containers.
Mastic must be transported only in containers, and it must be protected from exposure to sunlight and precipitation.
4.6. Mastic produced in close proximity to construction sites can be delivered to the production site insulation works in a heated form - in asphalt distributors.
5. SAFETY REQUIREMENTS
5.1. Bitumen-rubber mastics are a flammable substance with a flash point of 240-300 °C.
5.2. When producing, melting, and sampling mastics, work clothes and personal protective equipment should be used in accordance with the “Standard industry standards for the free issuance of work clothes, safety footwear and safety devices", approved by the USSR State Committee for Labor and Social Issues and the All-Union Central Council of Trade Unions.
5.3. If a small amount of mastic catches fire, the fire should be extinguished with sand, felt felt, special powders, a foam fire extinguisher; developed fires should be extinguished with a foam jet or water from fire monitors.
Annex 1
RECOMMENDATIONS
according to the conditions of use of bitumen-rubber mastics
Content of components in mastic, % by weight 1. Oil construction bitumen or petroleum bitumen for insulation of oil and gas pipelines
BN-70/30 (BNI-IV)
BN-90/10 (BNI-V)
2. Rubber crumbs from shock-absorbed tires
3. Green oil - plasticizer
Notes:
1. To prepare MBR-75 mastic in the absence of green oil, one of the following plasticizers can be used:
a) axial oil Z or C according to GOST 610-72;
b) transformer oil according to GOST 10121-76;
c) polydiene according to TU 38-103-280-75.
Each of these plasticizers is added in an amount of 7%, and the percentage of bitumen is reduced accordingly.
2. MBR-100(2) brand mastic - antiseptic.
2. The composition of the mastic is specified during its manufacture depending on the properties of the bitumen used.
3. Crushed rubber (crumb rubber) obtained from processing scrap tires must meet the requirements technical specifications, approved in the prescribed manner, and meet the composition given in table. .
table 2
|
2. Humidity, %, no more |
|
|
4. Size of crumb rubber particles: |
|
|
1 mm, %, not less |
|
|
1.5 mm, %, no more |
4. Mastic is prepared by continuously mixing the components at a temperature of 180-200 °C (in field conditions) or at a temperature of 200-230 °C (in factory conditions) for 1.5-4 hours.
5. The filler is added to the molten and partially dehydrated bitumen in a dried and loosened form.
6. The plasticizer is introduced into the mastic before the end of its cooking, thoroughly mixing the entire mass until smooth.
GOST 15836-79
INTERSTATE STANDARD
BITUMEN-RUBBER MASTIC
INSULATING
TECHNICAL CONDITIONS
IPC PUBLISHING HOUSE OF STANDARDS
Moscow
INTERSTATE STANDARD
Reissue. March 2003
By Decree of the USSR State Committee for Construction Affairs dated December 29, 1978 No. 266, the introduction date was set
01.07.79
This standard applies to bitumen-rubber mastic, which is a multicomponent mass consisting of petroleum bitumen (or a mixture of bitumens), filler and plasticizer and intended for insulating underground steel pipelines and other structures in order to protect them from soil corrosion.
The scope of application of bitumen-rubber mastic is indicated in the Appendix.
Mastic must be used in accordance with building codes and regulations.
1. TECHNICAL REQUIREMENTS
1.1. Mastic must be manufactured in accordance with the requirements of this standard according to technological regulations approved in the prescribed manner.
1.2. Mastic, depending on the softening temperature, is divided into brands: MBR-65, MBR-75, MBR-90 and MBR-100.
1.3. To make mastic the following should be used:
As an organic binder - petroleum insulating bitumen in accordance with GOST 9812-74 or petroleum construction bitumen in accordance with GOST 6617-76;
As a filler - crumb rubber obtained from depreciated car tires according to technical specifications approved in the prescribed manner;
Green oil is used as a plasticizer and antiseptic.
1.4. The mastic must be homogeneous, without foreign inclusions and not have filler particles not covered with bitumen.
1.5. The mastic must meet the requirements specified in the table.
|
Indicator name |
Standard for brands |
|||
|
1. Softening temperature according to the “Ring and ball” method, ° C, not less |
||||
|
2. Depth of needle penetration at 25 ° C, 0.1 mm, not less |
||||
|
3. Extensibility at 25 ° C, cm, not less |
||||
|
4. Water saturation in 24 hours, %, no more |
||||
2. ACCEPTANCE RULES
2.1. The batch size is set in the amount of shift production, but not more than 150 tons. The batch must consist of only one brand of mastic, prepared according to the same recipe, technology and from the same components.
2.2. Acceptance control is carried out by the manufacturer according to the following indicators: softening temperature, needle penetration depth and extensibility.
2.3. The manufacturer is obliged to test the mastic for water saturation at least once a quarter, as well as with each change in the raw materials used to prepare the mastic.
2.4. The consumer has the right to carry out a control random check of the compliance of the mastic with the requirements of this standard, while observing the procedure for selecting samples indicated below and using their test methods.
An average sample of mastic in an amount of at least 1 kg is taken from each bag (barrel). A sample is taken in three places of the barrel (bag) - top, bottom and middle (about 0.3 kg each). All selected samples are fused, thoroughly mixed.
2.6. If the test results of the mastic are unsatisfactory for at least one of the indicators, a double test is carried out for this indicator on a double number of samples. The results of repeated tests are considered final.
3. TEST METHODS
3.1. Determination of uniformity
The uniformity of the mastic is determined by visual inspection of a piece of mastic in a chip or a layer of mastic applied to a strip of paper (cardboard) measuring 50x150 mm when dipped into the molten mass, the temperature of which is 160 - 180 ° C.
Mastic is considered homogeneous if the particles of crumb rubber are distributed evenly in it without clots or accumulations.
3.2. Determination of the softening temperature of mastic
3.2.1. Method of sampling and preparing them for testing
Sampling is carried out according to paragraph .
Before testing, the mastic sample is melted and, if necessary, dehydrated by careful heating without overheating to a temperature of 120 - 180 ° C while stirring with a glass rod.
3.2.2. Equipment, accessories and reagents
Apparatus for determining the softening temperature of bitumen LTR according to GOST 11506-73.
Mercury thermometer types TN-3 and TN-7 according to GOST 400-80.
Gas burner or electric stove with heating regulator.
Glass glass with a diameter of at least 90 mm and a height of at least 115 mm.
Tweezers.
3.2.3. Preparing for the test
The melted and dehydrated mastic is poured with some excess into two brass rings of the device, placed on a polished metal or glass plate, lubricated with talcum powder and glycerin (1:3). For mastic with an expected softening temperature above 100 °C, step rings are used, which are slightly heated.
After cooling the mastic in air for 30 minutes at a temperature (20± 2) °C the excess is cut off with a heated sharp knife flush with the edges of the rings.
3.2.4. Carrying out the test
Rings with mastic are inserted into the holes on the device suspension. A thermometer is inserted into the middle hole of the pendant so that the lower point of the mercury reservoir is flush with the lower surface of the mastic in the rings.
The prepared device is placed in a glass beaker filled with water, the temperature of which is (15± 0.5) °C, and kept there for 15 minutes. If the softening temperature of the mastic is above 80 °C, then instead of water, glycerin is poured into the glass, the temperature of which is (35 ± 0.5) °C. After 15 minutes, the pendant is removed from the glass and a steel ball is placed in the center of each ring on the surface of the mastic with tweezers, after which the pendant is lowered back into the glass.
The glass is placed on the heating device so that the plane of the rings is strictly horizontal.
The temperature of water or glycerin in the glass after the first 3 minutes of heating should rise at a speed of (5± 0.5) °C per 1 min.
For each ring and ball, note the temperature at which the mastic squeezed out by the ball touches the lower disk of the device.
3.2.5. Processing the results
The arithmetic mean of two parallel determinations is taken as the softening temperature of the mastic.
The differences between two parallel determinations should not exceed 1 °C.
3.3. Determination of needle penetration depth
3.3.1. Sampling method
3.3.2. Equipment and accessories
Penetrometer with a needle (manual or automatic) according to GOST 1440-78.
Glass thermometer according to GOST 28498-90
Stopwatch when using a hand-held penetrometer.
Calibrated metal rod with a diameter of 10 mm and a height of 50 mm.
A glass or metal flat-bottomed vessel with a capacity of at least 1 dm 3 and a height of at least 50 mm.
Metal cylindrical cup with a flat bottom, internal diameter (55± 2) mm, height (35 ± 2) mm.
Water bath.
Metal cup for melting mastic.
3.3.3. Preparing for the test
The melted and dehydrated mastic is poured into a metal cup so that its surface is no more than 5 mm below the top edge of the cup. Then, by quickly moving a burning match over the surface of the mastic, air bubbles are removed.
The cup with mastic is cooled in air for 1 hour at a temperature (20± 2) °C, and then for 1 hour - in a water bath, the temperature of which is (25± 0.5) °C.
3.3.4. Carrying out the test
The cup with mastic is removed from the bath and placed in a crystallizer filled with water, the temperature of which is (25± 0.5) °C. The height of the water layer above the surface of the mastic must be at least 10 mm. The crystallizer is placed on the device table and the needle tip is brought to the surface of the mastic so that the needle only lightly touches it.
The rack is brought to the top platform of the rod carrying the needle, and the arrow is set to zero or its position is noted, after which the stopwatch is simultaneously turned on and the device button is pressed, allowing the needle to freely enter the test sample for 5 s, after which the button is released.
After this, the ratchet is again brought to the upper platform of the rod with the needle and the reading of the device is noted.
The determination is repeated at least three times at different points on the surface of the mastic sample, spaced from the edges of the cup and from each other by at least 10 mm. After each dive, wipe the tip of the needle to remove any adhering mastic.
3.3.5. Processing the results
The depth of penetration of the needle, expressed in tenths of a millimeter (or numbers corresponding to the degrees of the instrument scale), is taken as the arithmetic mean of the results of three parallel determinations.
The discrepancies between the results of three parallel determinations should not exceed: when the needle penetration value is from 30 to 60 - 2; when the needle penetration value is less than 30 - 1.
3.4. Determination of the stretchability of mastic
3.4.1. Sampling method
Sampling is carried out according to paragraph .
3.4.2. Equipment, accessories and reagents
Ductilometer with brass forms - “eights” according to GOST 11505-75.
Glass thermometer according to GOST 28498-90, measured temperature range 0 - 50 °C, scale division 0.5 °C.
Knife with a straight blade for cutting mastic.
Polished metal or heat-resistant glass plate.
Metal cup for melting mastic.
3.4.3. Preparing for the test
A polished metal or glass plate and the inner side walls of the figure eight liners are coated with a mixture of talc and glycerin (1:3). Then the forms are assembled on a plate.
The melted and dehydrated mastic is poured with a slight excess into three brass figure-eight springform molds in a thin stream from one end of the mold to the other until it is filled above the brim.
The mastic in the mold is cooled for 30 minutes in air at a temperature (20± 2) °C, then the excess mastic is cut off with a heated sharp knife from the middle to the edges, flush with the edges of the mold, after which the molds with mastic, without removing from the plate, are kept for 1 hour in a water bath, the temperature of which is (25± 0.5) °C.
3.4.4. Carrying out the test
The molds with mastic are removed from the water, removed from the plate and fixed in a ductilometer filled with water, the temperature of which is (25± 0.5) °C. The height of the water layer above the mastic must be at least 25 mm. Then take out the side parts of the mold, set the pointer to “0”, turn on the ductilometer motor and observe the stretching of the mastic.
The stretching speed should be 5 cm per minute.
3.4.5. Processing the results
The stretchability of the mastic is taken to be the length of the mastic thread in centimeters, marked with an indicator at the moment of its breaking.
For each mastic sample, three determinations are carried out. The arithmetic mean of the results of three parallel determinations is taken as the tensile value. Discrepancies between the results should not exceed 10% of the arithmetic mean of the compared results.
3.5. Determination of water saturation of mastic - according to GOST 9812-74.
4. LABELING, PACKAGING, TRANSPORTATION AND STORAGE
4.1. The mastic must be packaged in barrels or paper bags with an internal coating that prevents the mastic from sticking to the container.
By agreement with the consumer, mastic may be shipped in uncoated paper bags.
4.2. Each package must have a label attached or an indelible stamp indicating:
b) name of the manufacturer and its address:
c) brand of mastic;
d) batch number;
e) date of manufacture of mastic;
f) designation of this standard.
4.3. The manufacturer must guarantee compliance of bitumen-rubber mastics with the requirements of this standard and accompany each batch of mastic with a document that must indicate:
a) the name of the organization in whose system the manufacturer is included;
b) name of the manufacturer and its address;
c) brand of mastic;
d) batch number;
e) batch size;
f) date of manufacture of mastic;
g) test results;
h) designation of this standard.
4.4. Mastic should be stored separately by brand indoors or under a canopy under conditions that exclude its heating and moisture.
4.5. When loading, unloading and transporting mastic, precautions must be taken to ensure the safety of the mastic and containers.
Mastic must be transported only in containers, and it must be protected from exposure to sunlight and precipitation.
4.6. Mastic produced in the immediate vicinity of construction sites can be delivered to the site of insulation work in a heated form - in asphalt distributors.
5. SAFETY REQUIREMENTS
5.1. Bitumen-rubber mastics are a flammable substance with a flash point of 240 - 300 °C.
5.2. During production, melting, and sampling of mastics, special clothing and individual means protection in accordance with the “Standard industry standards for the free issuance of work clothing, safety footwear and safety equipment”, approved by the USSR State Committee for Labor and Social Affairs and the All-Union Central Council of Trade Unions.
5.3. If a small amount of mastic catches fire, the fire should be extinguished with sand, felt felt, special powders, a foam fire extinguisher; developed fires should be extinguished with a foam jet or water from fire monitors.
ANNEX 1
|
Brand of mastic |
Ambient air temperature when applying mastic, ° C |
||||
|
1. Oil construction bitumen or petroleum bitumen for insulation of oil and gas pipelines |
|||||
|
BN-70/30 (BNI-IV) |
|||||
|
BN-90/10 (BNI-V) |
|||||
|
2. Rubber crumbs from shock-absorbed tires |
|||||
|
3. Green oil - plasticizer |
|||||
Notes:
1. To prepare MBR-75 mastic in the absence of green oil, one of the following plasticizers can be used:
b) transformer oil according to GOST 10121-76;
c) polydiene according to TU 38-103-280-75.
Each of these plasticizers is added in an amount of 7%, and the percentage of bitumen is reduced accordingly.
2. MBR-100 2 brand mastic - antiseptic.
2. The composition of the mastic is specified during its manufacture depending on the properties of the bitumen used.
3. Crushed rubber (crumb rubber) obtained by processing scrap car tires must meet the requirements of technical specifications approved in the prescribed manner and correspond to the composition given in table. .
Table 2
|
2. Humidity, %, no more |
|
|
4. Size of crumb rubber particles: |
|
|
1 mm, %, not less |
|
|
1.5 mm, %, no more |
4. Mastic is prepared by continuously mixing the components at a temperature of 180 - 200 ° C (at field conditions) or at a temperature of 200 - 230 °C (in factory conditions) for 1.5 - 4 hours.
5. The filler is added to the molten and partially dehydrated bitumen in a dried and loosened form.
6. The plasticizer is introduced into the mastic before the end of its cooking, thoroughly mixing the entire mass until smooth.
GOST 15836-79
UDC 666.964:699.82:006.354 Group Zh14
STATE STANDARD OF THE USSR UNION
BITUMEN-RUBBER INSULATING MASTIC
Specifications
Bitumen-rubber insulating mastic.
Date of introduction 1979-07-01
APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee for Construction Affairs dated December 29, 1978 N 266
INSTEAD GOST 15836-70
REISSUE. September 1994
1. This standard applies to bitumen-rubber mastic, which is a multicomponent mass consisting of petroleum bitumen (or a mixture of bitumens), filler and plasticizer and intended for insulating underground steel pipelines and other structures in order to protect them from soil corrosion.
The scope of application of bitumen-rubber mastic is specified in Appendix 1 to this standard.
Mastic must be used in accordance with building codes and regulations.
1. TECHNICAL REQUIREMENTS
1.1. Mastic must be manufactured in accordance with the requirements of this standard according to technological regulations approved in the prescribed manner.
1.2. Mastic, depending on the softening temperature, is divided into brands: MBR-65, MBR-75, MBR-90 and MBR-100.
1.3. To make mastic the following should be used:
As an organic binder - petroleum insulating bitumen in accordance with GOST 9812-74 or petroleum construction bitumen in accordance with GOST 6617-76;
As a filler - crumb rubber obtained from depreciated car tires according to technical specifications approved in the prescribed manner;
Green oil is used as a plasticizer and antiseptic.
1.4. The mastic must be homogeneous, without foreign inclusions and not have filler particles not covered with bitumen.
1.5. The mastic must meet the requirements specified in the table.
|
Indicator name |
Standard for brands |
|||
|
1. Softening temperature according to the “Ring and ball” method, °C, not less |
||||
|
2. Depth of needle penetration at 25°C, 0.1 mm, not less |
||||
|
3. Extensibility at 25°C, cm, not less |
||||
|
4. Water saturation in 24 hours, %, no more |
||||
2. ACCEPTANCE RULES
2.1. The batch size is set in the amount of shift production, but not more than 150 tons. The batch must consist of only one brand of mastic, prepared according to the same recipe, technology and from the same components.
2.2. Acceptance control is carried out by the manufacturer according to the following indicators: softening temperature, needle penetration depth and extensibility.
2.3. The manufacturer is obliged to test the mastic for water saturation at least once a quarter, as well as with each change in the raw materials used to prepare the mastic.
2.4. The consumer has the right to carry out a control random check of the compliance of the mastic with the requirements of this standard, while observing the procedure for selecting samples indicated below and using their test methods.
2.5. To check the compliance of the mastic with the requirements of this standard, 1%, but not less than two packaging units (bags, barrels), are selected from each batch of mastic.
An average sample of mastic in an amount of at least 1 kg is taken from each bag (barrel). A sample is taken in three places of the barrel (bag) - top, bottom and middle (about 0.3 kg each). All selected samples are fused, thoroughly mixed.
2.6. If the test results of the mastic are unsatisfactory for at least one of the indicators, a double test is carried out for this indicator on a double number of samples. The results of repeated tests are considered final.
3. TEST METHODS
3.1. Determination of uniformity
The uniformity of the mastic is determined by visual inspection of a piece of mastic in a chip or a layer of mastic applied to a strip of paper (cardboard) measuring 50X150 mm when dipped into the molten mass, the temperature of which is 160-180 ° C.
Mastic is considered homogeneous if the particles of crumb rubber are distributed evenly in it without clots or accumulations.
3.2. Determination of the softening temperature of mastic
3.2.1. Method of sampling and preparing them for testing
Sampling is carried out according to clause 2.5.
Before testing, the mastic sample is melted and, if necessary, dehydrated by careful heating - without overheating to a temperature of 120-180 ° C while stirring with a glass rod.
3.2.2. Equipment, accessories and reagents
Apparatus for determining the softening temperature of bitumen LTR according to GOST 11506-73.
Mercury thermometer types TN-3 and TN-7 according to GOST 400-80.
Gas burner or electric stove with heating regulator.
Glass glass with a diameter of at least 90 mm and a height of at least 115 mm.
Glycerin according to GOST 6823-77.
Talc according to GOST 19729-74.
3.2.3. Preparing for the test
The melted and dehydrated mastic, with some excess, is poured into 2 brass rings of the device, placed on a polished metal or glass plate, lubricated with talcum powder and glycerin (1:3). For mastic with an expected softening temperature above 100°C, step rings are used, which are slightly heated.
After cooling the mastic in air for 30 minutes at a temperature of (20+/-2)°C, the excess is cut off with a heated sharp knife flush with the edges of the rings.
3.2.4. Carrying out the test
Rings with mastic are inserted into the holes on the device suspension. A thermometer is inserted into the middle hole of the pendant so that the lower point of the mercury reservoir is flush with the lower surface of the mastic in the rings.
The prepared device is placed in a glass beaker filled with water, the temperature of which is (15 ± 0.5) ° C, and kept in it for 15 minutes. If the softening temperature of the mastic is above 80°C, then instead of water, glycerin is poured into the glass, the temperature of which is (35±0.5)°C. After 15 minutes, the pendant is removed from the glass and a steel ball is placed in the center of each ring on the surface of the mastic with tweezers, after which the pendant is lowered back into the glass.
The glass is placed on the heating device so that the plane of the rings is strictly horizontal.
The temperature of water or glycerin in the glass after the first 3 minutes of heating should rise at a rate of (5 ± 0.5) ° C per 1 minute.
For each ring and ball, note the temperature at which the mastic squeezed out by the ball touches the lower disk of the device.
3.2.5. Processing the results
The arithmetic mean of two parallel determinations is taken as the softening temperature of the mastic.
The differences between two parallel determinations should not exceed 1°C.
3.3. Determination of needle penetration depth
3.3.1. Sampling method
3.3.2. Equipment and accessories
Penetrometer with a needle (manual or automatic) according to GOST 1440-78.
Stopwatch according to TU 25-1819.0021-90 or TU 25-1894.003-90 when using a hand-held penetrometer.
Calibrated metal rod with a diameter of 10 mm and a height of 50 mm.
A glass or metal flat-bottomed vessel with a capacity of at least 1 liter and a height of at least 50 mm.
Metal cylindrical cup with a flat bottom, internal diameter (55±2) mm, height (35±2) mm.
Water bath.
Metal cup for melting mastic.
3.3.3. Preparing for the test
The melted and dehydrated mastic is poured into a metal cup so that its surface is no more than 5 mm below the top edge of the cup. Then, by quickly moving a burning match over the surface of the mastic, air bubbles are removed.
The cup with mastic is cooled in air for 1 hour at a temperature of (20±2)°C, then for 1 hour in a water bath, the temperature of which is (25±0.5)°C.
3.3.4. Carrying out the test
The cup with mastic is removed from the bath and placed in a crystallizer filled with water, the temperature of which is (25 +/- 0.5) ° C. The height of the water layer above the surface of the mastic must be at least 10 mm. The crystallizer is placed on the device table and the needle tip is brought to the surface of the mastic so that the needle only lightly touches it.
The rack is brought to the top platform of the rod carrying the needle, and the arrow is set to zero or its position is noted, after which the stopwatch is simultaneously turned on and the device button is pressed, allowing the needle to freely enter the test sample for 5 s, after which the button is released.
After this, the ratchet is again brought to the upper platform of the rod with the needle and the reading of the device is noted.
The determination is repeated at least three times at different points on the surface of the mastic sample, spaced from the edges of the cup and from each other by at least 10 mm. After each dive, wipe the tip of the needle to remove any adhering mastic.
3.3.5. Processing the results
The arithmetic mean of the results of three parallel determinations is taken as the depth of penetration of the needle, expressed in tenths of a millimeter (or numbers corresponding to degrees of the instrument scale).
The discrepancies between the results of three parallel determinations should not exceed: when the needle penetration value is from 30 to 60-2; when the needle penetration value is less than 30-1.
3.4. Determination of the stretchability of mastic
3.4.1. Sampling method
Sampling is carried out according to clause 2.5.
3.4.2. Equipment, accessories and reagents
Ductilometer with brass forms - "eights" according to GOST 11505-75.
Mercury glass thermometer according to GOST 27544-87, measured temperature range 0-50°C, scale division 0.5°C.
Knife with a straight blade for cutting mastic.
Polished metal or heat-resistant glass plate.
Talc according to GOST 19729-74.
Glycerin according to GOST 6823-77 or GOST 6259-75.
Metal cup for melting mastic.
3.4.3. Preparing for the test
A polished metal or glass plate and the inner side walls of the figure eight liners are coated with a mixture of talc and glycerin (1:3). Then the forms are assembled on a plate.
The melted and dehydrated mastic is poured with a slight excess into three brass figure-eight springform molds in a thin stream from one end of the mold to the other until it is filled above the brim.
The mastic in the mold is cooled for 30 minutes in air at a temperature of (20±2)°C, then the excess mastic is cut off with a heated sharp knife from the middle to the edges, flush with the edges of the mold, after which the molds with mastic, without removing from the plate, are kept for 1 hour in a water bath, the temperature of which is (25±0.5)°C.
3.4.4. Carrying out the test
The molds with mastic are removed from the water, removed from the plate and fixed in a ductilometer filled with water, the temperature of which is (25 +/- 0.5) ° C. The height of the water layer above the mastic must be at least 25 mm. Then take out the side parts of the mold, set the pointer to “0”, turn on the ductilometer motor and observe the stretching of the mastic.
The stretching speed should be 5 cm per minute.
3.4.5. Processing the results
The stretchability of the mastic is taken to be the length of the mastic thread in centimeters, marked with an indicator at the moment of its breaking.
For each mastic sample, three determinations are carried out. The arithmetic mean of the results of three parallel determinations is taken as the tensile value. Discrepancies between the results should not exceed 10% of the arithmetic mean of the compared results.
3.5. Determination of water saturation of mastic - according to GOST 9812-74.
4. MARKING, PACKAGING, TRANSPORTATION
AND STORAGE
4.1. The mastic must be packaged in barrels or paper bags with an internal coating that prevents the mastic from sticking to the container.
By agreement with the consumer, mastic may be shipped in uncoated paper bags.
4.2. Each package must have a label attached or an indelible stamp indicating:
b) name of the manufacturer and its address:
c) brand of mastic;
d) batch number;
e) date of manufacture of mastic;
f) designation of this standard.
4.3. The manufacturer must guarantee compliance of bitumen-rubber mastics with the requirements of this standard and accompany each batch of mastic with a document that must indicate:
a) the name of the organization in whose system the manufacturer is included;
b) name of the manufacturer and its address;
d) batch number;
e) batch size;
f) date of manufacture of mastic;
g) test results;
h) designation of this standard.
4.4. should be stored separately by brand indoors or under a canopy under conditions that exclude heating and humidification.
4.5. When loading, unloading and transporting mastic, precautions must be taken to ensure the safety of the mastic and containers.
Mastic must be transported only in containers, and it must be protected from exposure to sunlight and precipitation.
4.6. Mastic produced in the immediate vicinity of construction sites can be delivered to the site of insulation work in a heated form - in asphalt distributors.
5. SAFETY REQUIREMENTS
5.1. Bitumen-rubber mastics are a flammable substance with a flash point of 240-300°C.
5.2. When producing, melting, and sampling mastics, work clothing and personal protective equipment should be used in accordance with the “Standard industry standards for the free issuance of work clothing, safety footwear and safety equipment,” approved by the USSR State Committee for Labor and Social Affairs and the All-Union Central Council of Trade Unions.
5.3. If a small amount of mastic catches fire, the fire should be extinguished with sand, felt felt, special powders, a foam fire extinguisher; developed fires should be extinguished with a foam jet or water from fire monitors.
according to the conditions of use of bitumen-rubber mastics
|
Brand of mastic |
Ambient air temperature when applying mastic, °C |
|
From + 5 to - 30 |
|
on the composition and preparation of bitumen-rubber mastic
The composition of the mastic is given in Table 1.
Table 1
|
% by weight |
|||||
|
Component name |
|||||
|
1. Oil construction bitumen or oil bitumen for insulation of oil and gas pipelines: |
|||||
|
BN-70/30 (BNI-IV) |
|||||
|
BN-90/10 (BNI-V) |
|||||
|
2. Rubber crumbs from shock-absorbed tires |
|||||
|
3. Green oil - plasticizer |
|||||
Notes:
1. To prepare MBR-75 mastic in the absence of green oil, one of the following plasticizers can be used:
a) axial oil Z or C according to GOST 610-72;
b) transformer oil according to GOST 10121-76;
c) polydiene according to TU 38-103-280-75.
Each of these plasticizers is added in an amount of 7%, and the percentage of bitumen decreases accordingly.
2. MBR-100 2 brand mastic - antiseptic.
2. The composition of the mastic is specified during its manufacture depending on the properties of the bitumen used.
3. Crushed rubber (crumb rubber) obtained by processing scrap tires must meet the requirements of technical specifications approved in the prescribed manner and meet the composition given in Table 2.
table 2
|
Indicator name |
|
|
2. Humidity, %, no more |
|
|
4. Size of crumb rubber particles: |
|
|
1 mm, %, not less |
|
|
1.5, mm, %, no more |
4. Mastic is prepared by continuously mixing the components at a temperature of 180-200°C (in field conditions) or at a temperature of 200-230°C (in factory conditions) for 1.5-4 hours.
5. The filler is added to the molten and partially dehydrated bitumen in a dried and loosened form.
6. The plasticizer is introduced into the mastic before the end of its cooking, thoroughly mixing the entire mass until smooth.
GOST 15836-79
Group Zh14
INTERSTATE STANDARD
BITUMEN-RUBBER INSULATING MASTIC
Specifications
Bitumen-rubber insulating mastic. Specifications
MKS 91.100.50
Date of introduction 1979-07-01
By Decree of the USSR State Committee for Construction Affairs dated December 29, 1978 N 266, the implementation date was set at 07/01/79
INSTEAD GOST 15836-70
REISSUE. March 2003
This standard applies to bitumen-rubber mastic, which is a multicomponent mass consisting of petroleum bitumen (or a mixture of bitumen), filler and plasticizer and intended for insulating underground steel pipelines and other structures in order to protect them from soil corrosion.
The scope of application of bitumen-rubber mastic is indicated in Appendix 1.
Mastic must be used in accordance with building codes and regulations.
1. TECHNICAL REQUIREMENTS
1. TECHNICAL REQUIREMENTS
1.1. Mastic must be manufactured in accordance with the requirements of this standard according to technological regulations approved in the prescribed manner.
1.2. Mastic, depending on the softening temperature, is divided into brands: MBR-65, MBR-75, MBR-90 and MBR-100.
1.3. To make mastic the following should be used:
As an organic binder - petroleum insulating bitumen in accordance with GOST 9812-74 or petroleum construction bitumen in accordance with GOST 6617-76;
As a filler - crumb rubber obtained from depreciated car tires according to technical specifications approved in the prescribed manner;
Green oil is used as a plasticizer and antiseptic.
1.4. The mastic must be homogeneous, without foreign inclusions and not have filler particles not covered with bitumen.
1.5. The mastic must meet the requirements specified in the table.
Indicator name | Standard for brands |
|||
1. Softening temperature according to the “Ring and ball” method, °C, not less | ||||
2. Depth of needle penetration at 25 °C, 0.1 mm, not less | ||||
3. Extensibility at 25 °C, cm, not less | ||||
4. Water saturation in 24 hours, %, no more | ||||
2. ACCEPTANCE RULES
2.1. The batch size is set in the amount of shift production, but not more than 150 tons. The batch must consist of only one brand of mastic, prepared according to the same recipe, technology and from the same components.
2.2. Acceptance control is carried out by the manufacturer according to the following indicators: softening temperature, needle penetration depth and extensibility.
2.3. The manufacturer is obliged to test the mastic for water saturation at least once a quarter, as well as with each change in the raw materials used to prepare the mastic.
2.4. The consumer has the right to carry out a control random check of the compliance of the mastic with the requirements of this standard, while observing the procedure for selecting samples indicated below and using their test methods.
2.5. To check the compliance of the mastic with the requirements of this standard, 1%, but not less than two packaging units (bags, barrels), are selected from each batch of mastic.
An average sample of mastic in an amount of at least 1 kg is taken from each bag (barrel). A sample is taken in three places of the barrel (bag) - top, bottom and middle (about 0.3 kg each). All selected samples are fused, thoroughly mixed.
2.6. If the test results of the mastic are unsatisfactory for at least one of the indicators, a double number of samples is re-tested for this indicator. The results of repeated tests are considered final.
3. TEST METHODS
3.1. Determination of uniformity
The uniformity of the mastic is determined by visual inspection of a piece of mastic in a chip or a layer of mastic applied to a strip of paper (cardboard) measuring 50x150 mm when dipped into the molten mass, the temperature of which is 160-180 ° C.
Mastic is considered homogeneous if the particles of crumb rubber are distributed evenly in it without clots or accumulations.
3.2. Determination of the softening temperature of mastic
3.2.1. Method of sampling and preparing them for testing
Sampling is carried out according to clause 2.5.
Before testing, the mastic sample is melted and, if necessary, dehydrated by careful heating without overheating to a temperature of 120-180 ° C while stirring with a glass rod.
3.2.2. Equipment, accessories and reagents
Apparatus for determining the softening temperature of bitumen LTR according to GOST 11506-73.
Mercury thermometer types TN-3 and TN-7 according to GOST 400-80.
Gas burner or electric stove with heating regulator.
Glass glass with a diameter of at least 90 mm and a height of at least 115 mm.
Glycerin according to GOST 6823-2000.
Talc according to GOST 19729-74.
3.2.3. Preparing for the test
The melted and dehydrated mastic is poured with some excess into two brass rings of the device, placed on a polished metal or glass plate, lubricated with talcum powder and glycerin (1:3). For mastic with an expected softening temperature above 100 °C, step rings are used, which are slightly heated.
After cooling the mastic in air for 30 minutes at a temperature of (20±2) °C, the excess is cut off with a heated sharp knife flush with the edges of the rings.
3.2.4. Carrying out the test
Rings with mastic are inserted into the holes on the device suspension. A thermometer is inserted into the middle hole of the pendant so that the lower point of the mercury reservoir is flush with the lower surface of the mastic in the rings.
The prepared device is placed in a glass beaker filled with water, the temperature of which is (15±0.5) °C, and kept in it for 15 minutes. If the softening temperature of the mastic is above 80 °C, then instead of water, glycerin is poured into the glass, the temperature of which is (35 ± 0.5) °C. After 15 minutes, the pendant is removed from the glass and a steel ball is placed in the center of each ring on the surface of the mastic with tweezers, after which the pendant is lowered back into the glass.
The glass is placed on the heating device so that the plane of the rings is strictly horizontal.
The temperature of water or glycerin in the glass after the first 3 minutes of heating should rise at a rate of (5±0.5) °C per 1 minute.
For each ring and ball, note the temperature at which the mastic squeezed out by the ball touches the lower disk of the device.
3.2.5. Processing the results
The arithmetic mean of two parallel determinations is taken as the softening temperature of the mastic.
The differences between two parallel determinations should not exceed 1 °C.
3.3. Determination of needle penetration depth
3.3.1. Sampling method
3.3.2. Equipment and accessories
Penetrometer with a needle (manual or automatic) according to GOST 1440-78.
Glass thermometer according to GOST 28498-90
Stopwatch when using a hand-held penetrometer.
Calibrated metal rod with a diameter of 10 mm and a height of 50 mm.
A glass or metal flat-bottomed vessel with a capacity of at least 1 m and a height of at least 50 mm.
Metal cylindrical cup with a flat bottom, internal diameter (55±2) mm, height (35±2) mm.
Water bath.
Metal cup for melting mastic.
3.3.3. Preparing for the test
The melted and dehydrated mastic is poured into a metal cup so that its surface is no more than 5 mm below the top edge of the cup. Then, by quickly moving a burning match over the surface of the mastic, air bubbles are removed.
The cup with mastic is cooled in air for 1 hour at a temperature of (20±2) °C, then for 1 hour in a water bath, the temperature of which is (25±0.5) °C.
3.3.4. Carrying out the test
The cup with mastic is removed from the bath and placed in a crystallizer filled with water, the temperature of which is (25±0.5) °C. The height of the water layer above the surface of the mastic must be at least 10 mm. The crystallizer is placed on the device table and the needle tip is brought to the surface of the mastic so that the needle only lightly touches it.
The rack is brought to the top platform of the rod carrying the needle, and the arrow is set to zero or its position is noted, after which the stopwatch is simultaneously turned on and the device button is pressed, allowing the needle to freely enter the test sample for 5 s, after which the button is released.
After this, the ratchet is again brought to the upper platform of the rod with the needle and the reading of the device is noted.
The determination is repeated at least three times at different points on the surface of the mastic sample, spaced from the edges of the cup and from each other by at least 10 mm. After each dive, wipe the tip of the needle to remove any adhering mastic.
3.3.5. Processing the results
The depth of penetration of the needle, expressed in tenths of a millimeter (or numbers corresponding to the degrees of the instrument scale), is taken as the arithmetic mean of the results of three parallel determinations.
The discrepancies between the results of three parallel determinations should not exceed: when the needle penetration value is from 30 to 60 - 2; when the needle penetration value is less than 30 - 1.
3.4. Determination of the stretchability of mastic
3.4.1. Sampling method
Sampling is carried out according to clause 2.5.
3.4.2. Equipment, accessories and reagents
Ductilometer with brass forms - "eights" according to GOST 11505-75.
Glass thermometer according to GOST 28498-90, measured temperature range 0-50 °C, scale division 0.5 °C.
Knife with a straight blade for cutting mastic.
Polished metal or heat-resistant glass plate.
Talc according to GOST 19729-74.
Glycerin according to GOST 6823-2000 or GOST 6259-75.
Metal cup for melting mastic.
3.4.3. Preparing for the test
A polished metal or glass plate and the inner side walls of the figure eight liners are coated with a mixture of talc and glycerin (1:3). Then the forms are assembled on a plate.
The melted and dehydrated mastic is poured with a slight excess into three brass figure-eight springform molds in a thin stream from one end of the mold to the other until it is filled above the brim.
The mastic in the mold is cooled for 30 minutes in air at a temperature of (20±2) °C, then the excess mastic is cut off with a heated sharp knife from the middle to the edges flush with the edges of the mold, after which the molds with mastic, without removing from the plate, are kept for 1 hour in a water bath, the temperature of which is (25±0.5) °C.
3.4.4. Carrying out the test
The molds with mastic are removed from the water, removed from the plate and fixed in a ductilometer filled with water, the temperature of which is (25±0.5) °C. The height of the water layer above the mastic must be at least 25 mm. Then take out the side parts of the mold, set the pointer to “0”, turn on the ductilometer motor and observe the stretching of the mastic.
The stretching speed should be 5 cm per minute.
3.4.5. Processing the results
The stretchability of the mastic is taken to be the length of the mastic thread in centimeters, marked with an indicator at the moment of its breaking.
For each mastic sample, three determinations are carried out. The arithmetic mean of the results of three parallel determinations is taken as the tensile value. Discrepancies between the results should not exceed 10% of the arithmetic mean of the compared results.
3.5. Determination of water saturation of mastic - according to GOST 9812-74.
4. LABELING, PACKAGING, TRANSPORTATION AND STORAGE
4.1. The mastic must be packaged in barrels or paper bags with an internal coating that prevents the mastic from sticking to the container.
By agreement with the consumer, mastic may be shipped in uncoated paper bags.
4.2. Each package must have a label attached or an indelible stamp indicating:
b) name of the manufacturer and its address:
c) brand of mastic;
d) batch number;
e) date of manufacture of mastic;
f) designation of this standard.
4.3. The manufacturer must guarantee compliance of bitumen-rubber mastics with the requirements of this standard and accompany each batch of mastic with a document that must indicate:
a) the name of the organization in whose system the manufacturer is included;
b) name of the manufacturer and its address;
c) brand of mastic;
d) batch number;
e) batch size;
f) date of manufacture of mastic;
g) test results;
h) designation of this standard.
4.4. Mastic should be stored separately by brand indoors or under a canopy under conditions that exclude its heating and moisture.
4.5. When loading, unloading and transporting mastic, precautions must be taken to ensure the safety of the mastic and containers.
Mastic must be transported only in containers, and it must be protected from exposure to sunlight and precipitation.
4.6. Mastic produced in the immediate vicinity of construction sites can be delivered to the site of insulation work in a heated form - in asphalt distributors.
5. SAFETY REQUIREMENTS
5.1. Bitumen-rubber mastics are a flammable substance with a flash point of 240-300 °C.
5.2. When producing, melting, and sampling mastics, work clothing and personal protective equipment should be used in accordance with the “Standard industry standards for the free issuance of work clothing, safety footwear and safety equipment,” approved by the USSR State Committee for Labor and Social Affairs and the All-Union Central Council of Trade Unions.
5.3. If a small amount of mastic catches fire, the fire should be extinguished with sand, felt felt, special powders, a foam fire extinguisher; developed fires should be extinguished with a foam jet or water from fire monitors.
Appendix 1 (recommended). Recommendations for the conditions of use of bitumen-rubber mastics
Brand of mastic | Ambient air temperature when applying mastic, °C |
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Appendix 2. Recommendations for the composition and preparation of bitumen-rubber mastic
APPENDIX 2
1. The composition of the mastic is given in Table 1.
Table 1
Component name | |||||
1. Oil construction bitumen or oil bitumen for insulation of oil and gas pipelines: | |||||
BN-70/30 (BNI-IV) | |||||
BN-90/10 (BNI-V) | |||||
2. Rubber crumbs from shock-absorbed tires | |||||
3. Green oil - plasticizer | |||||
Notes:
1. To prepare MBR-75 mastic in the absence of green oil, one of the following plasticizers can be used:
a) axial oil Z or C according to GOST 610-72;
b) transformer oil according to GOST 10121-76;
c) polydiene according to TU 38-103-280-75*.
________________
* The document is not provided. For more information please follow the link. - Database manufacturer's note.
Each of these plasticizers is added in an amount of 7%, and the percentage of bitumen decreases accordingly.
2. MBR-100 brand mastic - antiseptic.
2. The composition of the mastic is specified during its manufacture depending on the properties of the bitumen used.
3. Crushed rubber (crumb rubber) obtained by processing scrap tires must meet the requirements of technical specifications approved in the prescribed manner and correspond to the composition given in Table 2.
table 2
Indicator name | ||||
2. Humidity, %, no more | ||||
4. Size of crumb rubber particles: | ||||
1 mm, %, not less | ||||
1.5, mm, %, no more | ||||
4. Mastic is prepared by continuously mixing the components at a temperature of 180-200 °C (in field conditions) or at a temperature of 200-230 °C (in factory conditions) for 1.5-4 hours.
5. The filler is added to the molten and partially dehydrated bitumen in a dried and loosened form.
6. The plasticizer is introduced into the mastic before the end of its cooking, thoroughly mixing the entire mass until smooth.
Electronic document text
prepared by Kodeks JSC and verified against:
official publication
M.: IPK Standards Publishing House, 2003