Device for testing composite asphalt pavement interlayer shear fatigue, and method thereof

Abstract

The invention discloses a device for testing composite asphalt pavement interlayer shear fatigue, and a method thereof. According to the present invention, a skew shearing experiment is adopted to determine the composite asphalt pavement interlayer shear fatigue lives under different temperature conditions. The device comprises a loading bar, a load testing system, a pressing block, a supporting block and a support platform, wherein the pressing block and the supporting block are provided with a concave part, when the loading rod loads, a specimen requiring test is positioned in a space formed by docking of the two concave parts. The testing method is: placing the specimen in the supporting block and the pressing block, loading on the specimen through a testing machine to generate the skew shearing failure to obtain the maximum failure load, and carrying out the shear fatigue experiment under the repeated load effect according to 0.2-0.8 times the maximum failure load. The device and the method are simple and easy to operate, the actual stress state of the composite asphalt pavement can be accurately simulated, and the important significances are provided for the designs and the evaluations of the composite asphalt pavement interlayer shear property and the interlayer structure and material, and the design of the asphalt layer thickness.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and relates to a device and method for interlayer shear fatigue testing of composite asphalt pavement. Background technique [0002] With the rapid development of highway construction in our country, the phenomenon of vehicle overloading is very common due to imperfect management and the drive of transportation and operation interests. The service life of expressway pavement is often lower than the design service life, and the early damage of pavement has caused great economic loss and waste of resources to the country, and has aroused widespread concern from the whole society. It is urgent to improve the durability of road engineering and promote the Better development of transportation business. Under this new situation, the highway industry is required to take the road of sustainable development, further increase scientific and technological innovation, and build highway projects tha...

AI Technical Summary

Problems solved by technology

The Chinese invention patent with the application publication number CN 102095680 A discloses a fixture for testing pavement interlayer shear fatigue specimens and its testing method. This method is not aimed at composite asphalt pavement structures and uses direct shear In addition to the horizontal friction force of the wheels on the road surface, the pavement structure is also subjected to the vertical pressure of the vehicle load. These two forces cause shear stress between the layers of the pavement structure. Therefore, if only the horizontal plane of the pavement structure is considered The stress does not consider the vertical compressive stress, which obviously does not conform to the actual stress state of the pavement, so the direct shear cannot accurately evaluate the interlayer shear strength and shear fatigue performance of the pavement structure

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