Modified asphalt storage stability standard viscosity detection method

Abstract

The invention relates to a modified asphalt storage stability standard viscosity detection method. The method comprises the following steps that 1, the bottom end, one-third height position and two-third height position of a stainless steel pipe with two open ends are provided sample outlets respectively, and the sample outlets are provided with ball valves; 2, the ball valve at the bottom end of the stainless steel pipe is turned off, and the ball valves at the one-third height position and two-third height position of the stainless steel pipe are turned on; a filtered modified asphalt sample is heated and poured into the stainless steel pipe; 3, the stainless steel pipe is placed into a drying oven to be heated for 48+ / -1 h, and then naturally cooled to indoor temperature; 4, the modified asphalt sample cooled to indoor temperature is heated and molten again; by adjusting the ball valves to be turned on or off, the upper one-third part of the modified asphalt is injected into a standard viscosity test instrument for standard viscosity testing, and the lower one-third part of the modified asphalt is injected into a standard viscosity test instrument for standard viscosity testing; the two results are compared, and therefore the stability can be analyzed. The modified asphalt storage stability standard viscosity detection method is accurate in result and high in efficiency.

Description

technical field [0001] The invention relates to the technical field of modified asphalt testing, in particular to a standard viscosity detection method for storage stability of modified asphalt. Background technique [0002] At present, the following defects exist in the modified asphalt segregation test: [0003] (1) The test conditions can not well simulate the actual storage conditions of modified asphalt, and the test temperature conditions are inconsistent with the actual conditions (the test conditions are 163 ° C ± 5 ° C oven heating for 48 ± 1 h, and then refrigerated in a sub-zero refrigerator for at least 4 hours before melting Do the storage stability segregation test, the actual modified asphalt storage temperature does not have such rapid cooling and rapid heating change process); 52 hours of test time, even if the test results are reliable, it can only guarantee the stability of the modified asphalt within 52 hours, and cannot guarantee storage Stable for more...

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Problems solved by technology

[0003] (1) The test conditions can not well simulate the actual storage conditions of modified asphalt, and the test temperature conditions are inconsistent with the actual conditions (the test conditions are 163 ° C ± 5 ° C oven heating for 48 ± 1 h, and then refrigerated in a sub-zero refrigerator for at least 4 hours before melting Do the storage stability segregation test, the actual modified asphalt storage temperature does not have such rapid cooling and rapid heating change process); 52 hours of test time, even if the test results are reliable, it can only guarantee the stability of the modified asphalt within 52 hours, and cannot guarantee storage Stable for more than 52 hours

[0004] ⑵Using aluminum tubes or glass test tubes as modified asphalt sample containers cannot be reused, which is a waste of resources, and glass test tubes are used to freeze for at least 4 hours and then smashed, which also increases the unsafe factors of the test environment

[0005] (3) The slenderness ratio of the test container does not match the geometric dimension ratio of the on-site asphalt storage equipment

[0006] (4) During the freezing process of the modified asphalt sample, the segregation speed of the modified asphalt slows down, which is quite different from the actual segregation process.

[0007] ⑸Using softening point analysis of modified asphalt storage stability test process requires repeated heating and cooling of modified asphalt (ie heating, freezing, heating, cooling, reheating), and the aging of modified asphalt is accelerated in the process of repeated heating. At the same time, repeated heating will prolong the test period and reduce the test efficiency. More importantly, the test cold and hot cycle process is inconsistent with the actual storage cold and hot process.

Does not reflect the actual storage stability well

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