Asphalt mixture simulation fatigue test method under control strain loading mode

Abstract

The invention discloses an asphalt mixture simulation fatigue test method under a control strain loading mode; the test method comprises the steps: obtaining asphalt mortar fatigue failure conditionsby carrying out a fatigue test of asphalt mortar, carrying out fatigue test to output a fatigue characterization variable by generating an asphalt mixture simulation test specimen, and comparing the output characterization variable with the fatigue failure conditions, so as to obtain asphalt mixture fatigue failure related parameters. The method can well simulate the stress state of the asphalt mixture during the four-point bending fatigue test; based on the obtained asphalt mortar fatigue performance attenuation law, the method can arbitrarily change the content of coarse aggregates to achieve simulation of the asphalt mixture fatigue process without actual asphalt mixture fatigue tests, solves the problems that an asphalt mixture fatigue test cycle is long, the discreteness of experimental results is large and the test cost is high, and is of great significance for professional research on road engineering.

Description

technical field [0001] The invention relates to a fatigue test method, in particular to a simulated fatigue test method of asphalt mixture under a control strain loading mode. Background technique [0002] Fatigue cracks are one of the main damage forms of asphalt pavement. Asphalt mixture is the main component of asphalt pavement, and its fatigue performance has an important influence on the occurrence and development of fatigue cracks in asphalt pavement. The research on the fatigue performance of asphalt mixture is mainly carried out from two aspects: one is the outdoor large-scale loop test. This test method has the advantages of accurate experimental results and direct application, but the cost of test time and capital is high. At present, only A small number of countries adopt this method; the second is the indoor small-scale fatigue test. This test method has a relatively short test period and relatively low capital investment, but the experimental results are highly d...

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: the present invention proposes a simulation fatigue test method for asphalt mixture under the controlled strain loading mode, through which the four-point bending fatigue test simulation of the asphalt mixture under the controlled strain loading mode can be realized, and the four-point bending fatigue test simulation of the asphalt mixture is solved. The point bending fatigue test is highly discrete, and the test time and capital costs are high. Moreover, during the simulation test, the mechanical indicators inside the asphalt mixture simulation test piece can be calculated and monitored in real time.

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