Triaxial test device for asphalt mixture and test method

Abstract

The invention discloses a triaxial test device for an asphalt mixture, which comprises an outer air bag assembly, an inner air bag assembly, an upper press plate, a lower press plate and an air pressure console, wherein an outer air bag of the outer air bag assembly is placed on the outside of a test piece and wraps the outer lateral surface of the test piece; an inner air bag of the inner air bag assembly is installed in an inner hole of the test piece and is in close contact with the inner hole surface of the test piece; and the air pressure console can provide stable air pressure for the inner air bag assembly and the outer air bag assembly. The device has the characteristics that the control is easy, and the corner effect in the turning corner position of a traditional cubic triaxial test piece can be prevented. The triaxial test method for the asphalt mixture solves the problem that existing triaxial test devices are not suitable for the asphalt mixture, so that the strength study for the asphalt mixture is expanded from single-dimensional stress state to three-dimensional stress state; therefore, the triaxial test device and method of the asphalt mixture have important significance for studying the mechanical property of the asphalt mixture, the design of the asphalt mixture and the prevention and treatment of asphalt road surface damage under the complicated stress state.

Description

technical field [0001] The invention belongs to the field of road engineering, in particular to an asphalt mixture triaxial test device and a test method. Background technique [0002] As of the end of 2012, my country's completed expressways ranked second in the world, more than 90% of which are asphalt roads. During the construction of high-grade highway asphalt pavement, road workers have solved a lot of technical problems and accumulated rich practical experience. However, judging from the use of asphalt pavement that has been put into operation in recent years, many asphalt pavement structures have various degrees of disease before reaching the design life, resulting in huge economic losses and adverse social impacts. Especially in recent years, the substantial increase of overloaded and heavy-duty vehicles makes the asphalt pavement encounter various damages and damages during use. When studying these problems, the research on the strength problem under primary load ...

AI Technical Summary

Problems solved by technology

During the three-way loading process of the cube specimen, there are problems of mutual restriction between the rigid loading plates, deformation of the specimen constrained by the rigid plate, and mutual interference between the flexible liquid capsules.

In order to solve this problem, a gap is usually reserved between the vertical pressure plate and the horizontal pressure plate to avoid mutual extrusion between the pressure plates during the test, but the reserved gap will cause Inhomogeneous stress and strain (i.e. corner effects) affect the accuracy of test results

[0007] (2) The existing true triaxial tester is not suitable for asphalt mixture

[0008] (3) The existing true triaxial testing machine is not easy to popularize and apply

Because the research and development process of the triaxial tester is very complicated, the cycle is long, and the price is expensive, it is difficult to carry out large-scale promotion and application

Restricted by technical factors and other aspects, a triaxial test device suitable for asphalt mixture has not been developed at home and abroad, which has become a bottleneck restricting the research on the strength characteristics of asphalt mixture

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