Test device and method for water-temperature coupling in open type asphalt mixture

Abstract

This invention relates to a test device and method for water-temperature coupling in an open type asphalt mixture, in particular to an asphalt mixture test device and method thereof and aiming at solving the problems that the asphalt mixture test device cannot exert positive and negative hydrostatic pressures or positive and negative circulating hydrodynamic pressures, the asphalt mixture test method is not comprehensive enough but has a bad effect in simulating the water action on asphalt pavement, and the like. In the test device, an asphalt mixture test piece is arranged in a water pressure barrel, a spring is arranged between a piston and the asphalt mixture test piece, valves are arranged at a water hole and an exhaust hole, a pressure gauge is arranged at a pressure detecting hole, and a water pipe connects a second valve with a water bath box. The method comprises the steps of putting the test piece in the water pressure barrel, and filling water in the water pressure barrel fully; immerging the piston in the water; leading the piston to do simple harmonic motions up and down; immerging the piston in the water again; descending or lifting the piston to generate a positive or negative hydrostatic pressure; and opening the second valve, and leading the piston to do simple harmonic motions to generate a hydrodynamic pressure. The device and the method in the invention are applied to the asphalt mixture tests.

Description

technical field [0001] The invention relates to an asphalt mixture test device and method, in particular to an open asphalt mixture water and temperature coupling test device and method, belonging to the technical field of road engineering materials. Background technique [0002] Water damage to asphalt pavement has always been an important and urgent problem to be solved, and it is of great significance to provide a device and method that can effectively and accurately simulate the effect of water on asphalt pavement. Existing test methods mainly include: hydrostatic compression test, improved Lotman test (freeze-thaw cycle), immersion wheel track test and environmental condition system ECS. The above-mentioned methods all simulate the action of water by immersion or freeze-thaw cycles, and use the changes of some objective indicators to characterize the performance change of asphalt mixture after being subjected to water action. The general trend is to try to more realist...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing asphalt mixture test device cannot apply hydrostatic positive pressure, hydrostatic negative pressure and dynamic water positive and negative cycle pressure to the asphalt mixture test piece, and the pressure is uncontrollable. In the mixture test method, the freeze-thaw cycle or vacuum saturated water to simulate the water action on the asphalt pavement is not comprehensive, direct enough, and the effect is poor, and it cannot objectively simulate the effect of water on the hydrodynamic pressure in the void of the mixture. An open asphalt mixture water and temperature coupling test device and method

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