Asphalt mixture fatigue property test method based on wheel load instrument

Abstract

The invention provides an asphalt mixture fatigue property test method based on a wheel load instrument, and the method comprises a wheel load instrument and a test piece. The method comprises the following steps of: a. before the test, installing a strain sensor at the bottom of the asphalt mixture test piece, and obtaining a stress distribution situation of the test piece in the effect of a moving load through a mechanical method or finite element analysis calculation according to the characteristics of the moving wheel load and the size of the test piece; b. during the test, firstly preloading the test piece, obtaining the size of the moving wheel load to be applied according to the strain value generated by the test piece, applying a periodical fixed moving wheel load to the test piece through the wheel load instrument, and measuring the strain capacity of the tensile deformation generated by the test piece by the strain sensor; c. after the test, obtaining the stress and the strain capacity of the test piece and the applying time of the periodical moving wheel load through the wheel load instrument and the strain sensor. The method provided by the invention is simple and practicable and is convenient to popularize; and the asphalt mixture test piece in the test is in a stress state the same as that of an actual asphalt concrete road surface.

Description

technical field [0001] The invention belongs to the field of road engineering, and in particular relates to a fatigue performance test method of an asphalt mixture based on a wheel load meter, which is used for testing the fatigue performance of the asphalt mixture. Background technique [0002] In recent years, the vigorous development of highway traffic, especially the construction of high-grade highways, has put forward higher requirements for the quality and function of road materials. The performance, quality and composition design of road materials play a vital role in its development, and testing and understanding the performance of road materials through reasonable test methods is the premise and basis for the correct and effective use of road materials. Due to its many advantages, asphalt concrete pavement has been widely used in road engineering construction. The current high-grade roads in our country basically use asphalt concrete pavement. [0003] Fatigue crac...

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Problems solved by technology

[0014] (3) The size of the test piece is small, and the test accuracy will decrease due to the influence of the uniformity of the test piece for asphalt mixtures using large aggregates

It can be seen from Figure 5 that according to the original APA There is a certain gap between the fatigue life obtained by the fatigue test and the fatigue life judged by the fatigue analysis theory of asphalt mixture. Therefore, it is inaccurate to define the moment when the asphalt mixture is completely broken as its fatigue life.

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