Asphalt concrete elevated temperature property testing method

Abstract

The method comprises: the circle center of testing machine base, the central shaft of the asphalt concrete test piece, the circle center of the test machine loading platen, and the loading pressure head of the testing machine are located at same perpendicular line; the section diameter of the loading platen of the testing machine is less than the section diameter of the asphalt concrete test piece; the section diameter of the testing machine base is less than the section diameter of the asphalt concrete test piece; the section diameter of loading platen of the testing machine is identical with the section diameter of the testing machine base.

Description

technical field [0001] The invention relates to the technical field of asphalt concrete high temperature performance test. Background technique [0002] At present, rutting has become one of the main failure forms of asphalt pavement on high-grade highways. The calculation and prediction of rutting must be based on accurate model parameters; however, to obtain accurate high-temperature deformation parameters of asphalt concrete and correctly evaluate asphalt The high-temperature deformation resistance of the mixture can only be obtained by tests that conform to the actual stress state and environmental conditions of the road surface. According to the correlation between the test method and the anti-deformation performance of asphalt concrete, the test method can be divided into three categories: [0003] (1) Empirical test methods: such as the Marshall test method, a large number of studies have proved that the Marshall stability index of the Marshall test is not directly r...

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Problems solved by technology

However, its shortcomings are reflected in the fact that the concrete state simulated by the test is not completely consistent with the actual pavement conditions; for example, the bending creep describes the deformation law of concrete within the one-dimensional elastic strain range, and the analytical formula does not hold when it exceeds the elastic range

Due to the lack of confining pressure, the uniaxial test does not conform to the actual road surface stress situation, and it will fail prematurely under high temperature and stress, so that the real concrete performance cannot be obtained. For example, the uniaxial test may attribute SMA to the anti-deformation performance This is not correct; although the triaxial test can overcome the shortcomings of the uniaxial test, its fixed confining pressure is also different from the confining pressure in the actual road surface, which changes with temperature, stress and concrete damage degree. The status does not match, and the triaxial test has limited its widespread use due to the complicated test method

[0006] It can be seen that there is no relatively simple and perfect test method among the test methods for studying the high-temperature deformation performance of asphalt concrete. Therefore, there is an urgent need for a test method that can not only truly and effectively simulate the actual road surface stress and environmental conditions, but also obtain mechanical parameters and be applied. Test method for high-temperature deformation resistance of asphalt concrete for high-temperature performance evaluation and mechanical calculation

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