Device and method for simulating propagation of reflective cracks of semi-rigid-base asphalt pavement

Abstract

The invention discloses a device and a method for simulating propagation of reflective cracks of a semi-rigid-base asphalt pavement. The device comprises an environmental cabinet, a reflective crack simulating platform, a reflective crack testing system and an acquisition control system, wherein a pedestal is arranged at the bottom of the environmental cabinet; and the reflective crack testing system comprises a horizontal open-type reflective crack testing module and a vertical shear-type reflective crack testing module. The device not only can simulate open-type reflective cracks in the horizontal direction, but also can simulate shear-type reflective cracks in the vertical direction, and can really simulate occurrence and the propagation of the actual reflective cracks of the semi-rigid-base asphalt pavement, so that a reference basis is provided for selecting an anti-cracking material and an anti-cracking structure in pavement structure design.

Description

technical field [0001] The invention belongs to the technical field of anti-reflection crack research on semi-rigid base asphalt pavement of highway engineering, and in particular relates to a semi-rigid base asphalt pavement reflection crack expansion simulation device and a simulated reflection crack evaluation method. Background technique [0002] In view of the specific situation of my country's transportation industry and the design concept of strong base and thin surface, asphalt pavement with semi-rigid base is the main form of expressways, national and provincial trunk roads and other municipal roads in my country. However, this form of pavement exists. An unavoidable drawback is reflection cracks. If the early reflective cracks are not treated in time, when the cracks penetrate the surface, the infiltration of road surface water will form high-pressure water under the action of traffic load, and the repeated action of traffic load will cause erosion and mud pumping, ...

AI Technical Summary

Problems solved by technology

[0004] At present, the indoor tests for evaluating the anti-reflection cracks of asphalt mixtures include: direct tensile test, indirect tensile test, bending tensile fatigue test, shear fatigue test and impact toughness test, etc. The horizontal comparison is acceptable, but the specific methods used to guide the design of semi-rigid base asphalt pavement and the main anti-reflective crack evaluation methods need to be discussed

Because these experimental methods are mainly based on phenomenological methods, they do not start with the mechanism of the generation and expansion of reflective cracks, and lack the influence of changes in pavement structure and other factors on pavement reflective cracks

[0005] In summary, it can be seen that the current ability evaluation and test evaluation methods for asphalt pavement resistance to reflective cracks are not able to simulate the occurrence and expansion of actual reflective cracks on semi-rigid base asphalt pavement.

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