Asphalt pavement reflection crack propagation analog experiment device

Abstract

The invention discloses a blacktop reflecting crack propagation analog experiment device which includes an environment box and a blacktop simulative platform and a reflecting crack propagation tester arranged in the environment box. The reflecting crack propagation tester includes a horizontal pulling fatigue test part, a vertical cutting fatigue test part and a data collecting part controlled by a microcomputer. The blacktop simulative platform includes a fixed testing vehicle (1) and a skip car frame (3) welded as a whole, and an active testing skip car (2) that can move horizontally on the skip car frame (3). The device can carry through pulling type and cutting type reflecting crack propagation expanding large scale dimension road structure experiment, analyze and compare the anti-crack effects of different blacktop structures or materials, acquire relevant calculating parameters and verify a theoretical calculating result, and provide a reliable testing basis for the blacktop structure design.

Description

technical field [0001] The invention relates to the crack resistance research field of highway engineering asphalt pavement, in particular to providing a simulation test device for reflecting crack expansion of asphalt pavement. Background technique [0002] Since the 1970s, the domestic and foreign road engineering circles have been very active in the research on reflective cracks in asphalt pavement. To understand the generation process of reflective cracks and to propose effective prevention measures are two core issues to solve reflective cracks. Therefore, the research on these two issues is the key to improve the durability of asphalt pavement. Although static analysis, fracture and damage mechanics, and finite element method provide a theoretical basis for the analysis of reflective cracks in asphalt pavement, due to the complexity of the pavement structure and the variability of material parameters, theoretical analysis alone cannot fully To solve the research topic...

AI Technical Summary

Problems solved by technology

From the perspective of phenomenology, the influence of asphalt or interlayer materials on the crack resistance of the mixture is analyzed, and the difference in the crack resistance of the entire pavement caused by the change of pavement structure is not involved; from the perspective of mechanical approximation, the asphalt mixture is regarded as uniform The properties, elasticity, and isotropy of the asphalt mixture are analyzed, but the calculation results are quite different from the actual engineering. Therefore, neither of the two methods can fully reveal the damage, fatigue and damage of the asphalt mixture under load. fracture mechanism

[0005] Asphalt mixture is a combination of viscoelasticity, plasticity and heterogeneity. Existing test methods or calculation models cannot fully and truly reflect the formation, propagation and fracture of reflective cracks in pavement structures. To develop a more realistic reflection of asphalt pavement structure It is a tester that reflects the formation and expansion of cracks under load, which has very important practical significance

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