GB/T 4510-1984 Determination of brittle point of petroleum asphalt GB/T4510-1984 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Test method for breaking point of petroleum bitumens
UDC 665.521.8
GB/T 4510—84
This method is applicable to the determination of the brittle point of solid or semi-solid petroleum bitumen. The temperature at which the bitumen film coated on the metal sheet cracks due to cooling and bending under specific conditions is the brittle point. 1 Summary of the method
The thin steel sheet coated with the sample is bent under specified conditions and continuously decreasing temperatures until cracks appear in the frozen layer of the bitumen. 2 Instruments and materials
2.1 Instruments
2.1.1 Bender (see Figure 1).
It consists of two concentric tubes 6, which are made of hard glass or other insulating materials. A clamp 7 is tightly installed at the lower end of each tube. A slit is left in the inner tube between the two clamps so that the mercury ball of the thermometer can be exposed. The thermometer is fixed in the inner tube. A mechanical lifter with a crank 1 is installed at the upper end of the two concentric tubes. Turning the crank 1 can make the inner tube move up and down relative to the outer tube, thereby changing the distance between the two clamps. The maximum distance between the clamps is 39.9±0.1 mm. Turning the crank 10 to 12 times can shorten the distance between the two clamps by 3.5±0.2 mm.
2.1.2 Thin sheet
Elastic steel sheet, which does not deform after repeated bending, is 41±0.05 mm long, 20±0.2 mm wide, and 0.15±0.02 mm thick. The thin sheet must be flattened when not in use.
2.1.3 Cooling device (see Figure 1).
It includes a large test tube 4 (35 mm inner diameter, 210 mm long), which is fixed eccentrically in a second larger test tube 5 (55 mm inner diameter, 200 mm long) by means of a rubber stopper 3. The rubber stopper 3 is provided with a small funnel 9. A small amount of calcium chloride or other dehydrating agent is contained in the test tube 4 and the cylindrical glass tube 8. The bender is supported in the test tube 4 by means of a rubber stopper 2. 5 and 8 can be replaced by an unsilver-plated vacuum bottle of suitable size.
2.1.4 Thermometer: -38～30℃, in accordance with GB/T514 "Technical Conditions for Liquid Thermometers for Petroleum Product Testing". 2.1.5 Heater
It consists of a heat source, a heating plate and a stand. A flat metal heating plate with a length of 160 mm, a width of 80 mm and a thickness of 3 mm is placed on a stand equipped with horizontal screws, and a heat source is provided under the heating plate. 2.1.6 Porcelain III or metal III.
2.1.7 Sieve: Metal mesh with mesh size of 0.3-0.5 mm. 2.2 Materials
2.2.1 Ice or other coolants.
2.2.2 Industrial ethanol or acetone.
National Bureau of Standards Issued on June 17, 1984
Implemented on September 1, 1984
GB/T4510--84
1 Sowing handle, 2, 3-rubber stopper 4, 5-test tube, 6-glass tube, 7-pin, 8-cylindrical glass tube: 9-funnel
3 Test steps
Inner tube: inner diameter 7.5 mm, outer diameter 11.5 mm, length 190-195 mm,
Outer tube: inner diameter 12.5 mm, outer diameter 16.5 mm, length 170-175 mm
3.1 When the sample contains water, heat it at a temperature not exceeding 130℃ and stir it continuously until the water is removed, and then filter it with a sieve. When it is considered unnecessary to heat and dehydrate the sample and filter it, it is allowed to proceed directly according to 3.2 of this method. 3.2 On a clean sheet, weigh 0.4±0.01g of the sample. Place the sheet on a metal heating plate and heat it slowly. The temperature of the heating plate shall not be higher than 80℃ above the softening point of the sample. When the asphalt just flows, clamp the sheet with tweezers and swing it back and forth, so that the asphalt is evenly spread on the surface of the sheet to form a smooth film. When there are bubbles in the sample, gently heat its surface with a small fire of 5-10mm long and 5mm in diameter while avoiding local overheating, so that the bubbles are discharged and the surface is smooth and uniform. The sample must be completed within 5-10 minutes from the beginning of heating on the heating plate. www.bzxz.net
Note: For samples with high softening points, you can also use a very clean fine needle tip to unfold it, and you can also use thin sheets such as cellophane to separate and press the properly heated samples. 3.3 The steel sheet coated with the sample should be carefully moved from the hot metal plate to another cold metal plate immediately. Before the test, let it stand at room temperature for 30 minutes to 4 hours, and protect the thin sheet sample from dust. 3.4 Inject industrial ethanol or acetone into test tube 5, and the amount injected is about half of the test tube space. Slowly bend the thin sheet and place it between the two clamps of the bender, and install the bender in tube 4. 3.5 Add dry ice to the ethanol or acetone through a funnel, and control the speed of addition so that the temperature drops by 1°C per minute. When the temperature reaches at least 10°C above the expected brittle point, start turning the crank at a speed of 1 revolution per second until the distance between the clamps is shortened by 3.5±0.2 mm. At the same time, observe whether there are cracks on the sample on the thin sheet, and then turn it back at the same speed. Bend the thin sheet once per minute in this way. 3.6 The temperature when one or more cracks appear when the thin sheet is bent is taken as the brittle point of the sample. 4 Calculate
Repeat the test for three times. The difference between the maximum and minimum values ​​of the three test results should be within 3°C. Calculate the average of the three test results and take the integer as the brittle point of the sample. 5 Precision
5.1 Repeatability
The difference between two test results of the same operator shall not exceed 2℃. 5.2 Reproducibility
Not specified for the time being.
6 Report
Take the arithmetic mean of the test results as the result of this test. Additional notes:
This standard is proposed by China Petrochemical Corporation. This standard is under the technical jurisdiction of East China Petroleum Institute. This standard is drafted by the refinery of Qilu Petrochemical Industry Corporation. The main drafters of this standard are Cui Xintian, Huang Jie, Bai Wenru, etc. This standard refers to IP80/53.
From the date of implementation of this standard, the freezing point part of the former Ministry of Petroleum Industry Standard SY2811--82 "Insulation Adhesive Test Method" will be invalid. 443
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