Asphalt mixture static modulus testing method

Abstract

The invention discloses an asphalt mixture static modulus testing method comprising the following steps of: (1) preparing a cylindrical test piece of an asphalt mixture, and two steel pressure heads; (2) placing the cylindrical test piece and the two steel pressure heads into a thermostat with target temperature, and preserving heat for more than 5 hours; (3) taking out the cylindrical test piece and the two steel pressure heads, respectively arranging the two steel pressure heads at the centers of two end faces of the cylindrical test piece; (4) loading the cylindrical test piece by means of changing the load speed of the steel pressure head, and simultaneously recording the load-deformation curve of the cylindrical test piece; and (5) calculating the static modulus of the asphalt mixture according to the load-deformation curve and the structure size of the cylindrical test piece. According to the asphalt mixture static modulus testing method provided by the invention, the used local loading test can effectively simulate the side constraint to the asphalt mixture in the actual road surface; and the test devices used in the method are simple and easy to operate, so that the test can be carried out in normal laboratories.

Description

technical field [0001] The invention relates to a method for testing the static modulus of asphalt mixture, which belongs to the technique of testing the mechanical properties of asphalt mixture. Background technique [0002] The uniaxial compression test of asphalt mixture used in my country's "Asphalt and Asphalt Mixture Test Regulations" (JTJ052-2000) cannot simulate the lateral restraint of the actual asphalt pavement. However, the presence or absence of lateral constraints has a great influence on the deformation characteristics of the mixture, so the presence of lateral constraints can more realistically simulate the actual situation. Only tests that can simulate the confining pressure state of actual pavement asphalt mixture (including lateral constraints) can obtain accurate mechanical parameters. The lateral constraints in the actual pavement will change due to the performance of the asphalt mixture, the magnitude of the load and the change of temperature, so impos...

AI Technical Summary

Problems solved by technology

However, the disadvantage of the triaxial test is that it does not simulate the stress state of the actual pavement asphalt mixture well, and the confining pressure of the lateral restraint is a fixed value.

At the same time, it is very difficult to apply the confining pressure in the triaxial test, requiring a closed triaxial chamber, which has high requirements for the test equipment, which is not conducive to the popularization of the test method

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