Device and test method for detecting crack resistance of asphalt mixture

Abstract

The invention discloses a device for detecting the crack resistance of an asphalt mixture and a test method.The device comprises a machine body, dowel bars and a clamp assembly, the clamp assembly comprises a clamp bottom plate, supporting rods are arranged at the four corners of the clamp bottom plate respectively, and horizontal supporting plates are arranged between the supporting rods respectively; a side edge pressing plate is arranged above the supporting plate, and the two ends of the side edge pressing plate are detachably connected with the supporting rods in a sliding mode. A through hole is formed in the middle of the clamp bottom plate, and the end of the dowel bar is detachably connected with a middle pressing plate. A plurality of supporting feet are arranged below the clamp bottom plate in a central symmetry mode, the supporting feet are connected with the machine body in a sliding mode, and the poses of the supporting feet are fixed through limiting pieces. The device can be used for carrying out an anti-cracking performance test on a long-strip-shaped mixture test piece so as to obtain the anti-cracking performance of the mixture test piece and the micro change of the surface and the fracture; the clamping of the mixture test piece is simple and reasonable, the stability is good, the stress is balanced, and the test error is small.

Description

technical field [0001] The invention relates to the technical field of detection devices, in particular to a device and a test method for detecting crack resistance of asphalt mixtures. Background technique [0002] Asphalt mixture is a composite material, mainly composed of asphalt, coarse aggregate, fine aggregate, mineral powder, and some polymers and wood cellulose are added; different structures are formed by mixing these materials with different qualities and quantities. And have different mechanical properties. There are two types of asphalt mixtures most commonly used in engineering: one is asphalt concrete mixture, which is composed of coarse aggregate, fine aggregate and filler in an appropriate proportion and meets the specified gradation. It is mixed with asphalt binder and pressed The mixture with a residual void ratio of less than 10% after solidification is referred to as asphalt concrete, expressed by AC, and LH when a round hole sieve is used. The second i...

AI Technical Summary

Problems solved by technology

For example, the Chinese invention patent application (publication number: CN107063903A) disclosed a test device for evaluating the low-temperature crack resistance of asphalt mixture in 2017, including an environmental box, a control box, a moving beam, a support, a fixture, a pressure head, two The transmission shaft, the pressure sensor used to detect the pressure on the pressure head, the displacement sensor used to detect the displacement of the pressure head, and the temperature sensor used to detect the temperature inside the environmental chamber, wherein the support and the fixture are located in the environmental chamber, the test The device can accurately evaluate the low-temperature crack resistance of asphalt mixture; however, the fixture clamping stability and flexibility of the test device are not good, and the fixture itself also forms an additional force on the specimen, which makes the stress point of the specimen relatively weak. many

[0006] In addition, due to the layout of fixtures and structures, the existing test device for crack resistance of asphalt mixture cannot be used in common with other test devices for mechanical properties. high

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