Test and evaluation method of water-air stability of asphalt mixture

Abstract

The invention discloses a water stability test and evaluation method of asphalt mixture, which comprises the following steps: (1) forming several cylinder test pieces of asphalt mixture; (2) dividing the test pieces into two groups on average, and making them The average porosity is the same; (3) The splitting test of the first group of specimens is directly carried out to measure the splitting strength, and the average value TS0 is obtained; (4) The second group of specimens is first washed under the action of alternating positive and negative pressure Cycle 50 times, then carry out the splitting test to measure the splitting strength, and obtain the average value TS1; (5) The ratio TSR of the average splitting strength of the two groups is used as the evaluation index. The invention incorporates the hydrodynamic pressure, aerodynamic force and ambient temperature generated under the coupling conditions of driving and the environment into the test, so that the test environment conditions are closer to the actual road conditions, and the test results have a better correlation with the actual application effect , the test method is more reliable and effective.

Description

technical field [0001] The invention belongs to the technical field of road engineering material design and construction control, and relates to an asphalt mixture water stability test and evaluation method, and test detection and analysis on a construction site. Background technique [0002] In the design and construction control of road engineering materials, the water stability design and evaluation of asphalt mixture is a very important and indispensable item, which is used to evaluate the ability of the road surface to resist the erosion of external water such as natural rainfall. At present, water stability evaluation generally adopts test methods based on freeze-thaw cycles, such as the Lottoman Test (Lottoman Test), Tunnicliff & Root Test, and Modified Lottoman Test in the United States. Our country borrowed the characteristics of the method from the United States, and also proposed the freeze-thaw splitting test by using the freeze-thaw cycle method. [0003] The s...

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a water-air stability test and evaluation method of asphalt mixture that can simulate the dynamic effects of driving and environment, so as to overcome the defect that the existing freeze-thaw cycle evaluation method is inconsistent with the actual road surface conditions, The hydrodynamic pressure, aerodynamic force and ambient temperature generated under the coupling conditions of driving and environment are included in the test, so that the test environment conditions are closer to the actual road conditions, and the test results have a better correlation with the actual application effect. The method is also more reliable and effective

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