Test method for evaluating asphalt consumption of asphalt mixture

Abstract

The invention discloses a test method for evaluating asphalt consumption of an asphalt mixture. The test method comprises the following steps: S1, preparing a precipitation and leakage tester, a precipitation and leakage test cylinder, a glass plate, a small asphalt mixture mixer, a hand shovel, a balance and a cotton yarn test tool; S2, determining a mixing temperature according to an asphalt equiviscous temperature test, and carrying out a precipitation and leakage test; S3, in a cleaned and dried precipitation and leakage test cylinder, weighing the precipitation and leakage test cylinder m0 accurately to 0.01 g, putting the precipitation and leakage test cylinder m0 into a test box, and keeping a constant temperature for not less than 2 hours; and S4, mixing aggregate, a mineral powder, asphalt, a fiber stabilizer and the like by using the small asphalt mixture mixer according to a T0702 method according to a mixing ratio of the actually used asphalt mixture, and adding the fiber stabilizer after a coarse aggregate and a fine aggregate are added during mixing. According to the test method, the asphalt consumption of the asphalt mixture can be accurately and quantitatively evaluated, durability of a pavement is prevented from being influenced by too small asphalt mixture consumption, and precipitation, leakage and bleeding caused by too large asphalt consumption are also avoided.

Description

technical field [0001] The invention relates to the technical field of asphalt, in particular to a test method for evaluating the amount of asphalt in an asphalt mixture. Background technique [0002] At present, there are two calculation methods for the amount of asphalt in asphalt mixtures. One is to calculate the thickness of asphalt oil film, according to the gradation of the mixture composition, to calculate the specific surface area, and to calculate the threshold of asphalt amount according to the empirical asphalt oil film thickness. The other is to calculate the powder-to-glue ratio. , in the asphalt mixture, the ratio of the 0.075mm sieve penetration rate to the amount of asphalt, in the Suppaper design method, the powder-to-glue ratio is specified to be 0.6 to 1.6. [0003] However, the threshold value of asphalt dosage calculated according to the thickness of an asphalt oil film, due to the difference in aggregate density and water absorption, and the thickness o...

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Problems solved by technology

[0003] However, the threshold value of asphalt dosage calculated according to the thickness of an asphalt oil film, due to the difference in aggregate density and water absorption, and the thickness of the oil film itself is an empirical value, using a variety of variables and fuzzy values ​​to determine the threshold of asphalt dosage has no limitations.

[0004] It is also unscientific to use the two "powder-binder ratio" as one of the basis for judging. The range of powder-binder ratio is too wide, and the oil use of asphalt mixture has a lot to do with the physical properties and gradation combination of the aggregate itself. , the powder-to-binder ratio cannot reflect these properties, and there are limitations. Therefore, we propose a test method for evaluating the amount of asphalt in asphalt mixtures to solve the above problems

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