A device for studying stress absorbing interlayer stress diffusion property of composite pavement

Abstract

The invention discloses a device for studying a stress absorbing interlayer stress diffusion property of a composite pavement, which comprises a shell, a sample testing mechanism, a deformation testing mechanism and a shear applying mechanism, wherein the sample testing mechanism comprises a bed course, a cement concrete layer, a stress absorbing interlayer and an asphalt overlay; the deformation testing mechanism comprises a vertical deformation measuring instrument and two pairs of horizontal deformation measuring instruments; one pair of horizontal deformation measuring instruments is used for measuring the horizontal deformation of the asphalt overlay; the other pair of horizontal deformation measuring instruments is used for measuring the horizontal deformation of the cement concrete layer; the vertical deformation measuring instrument is used for measuring the deformation of the sample testing mechanism in the vertical direction; the shear applying mechanism comprises a pressure pump, a shear bar and a pressure head of the shear bar; the pressure pump is fixed on the shell, the shear bar is connected with the pressure pump and is connected with the pressure head of the shear bar; reserved cracks are formed in the cement concrete layer. The device provided by the invention is simple in structure, easy in operation, low in cost and the device can realize the quantitative assessment of the stress absorbing interlayer stress diffusion property.

Description

technical field [0001] The invention relates to the technical field of road engineering performance testing, in particular to a composite road surface stress absorption interlayer stress diffusion performance research device. Background technique [0002] Asphalt concrete pavement and cement concrete pavement are the main types of high-grade highways in my country. Although cement pavement has the advantages of high rigidity, good stability, long service life, good anti-fatigue characteristics, low maintenance cost and more convenient construction materials, according to incomplete statistics, the mileage of cement concrete pavement in my country's high-grade pavement is the same as the total road The proportion of mileage is less than 5%, and it shows a decreasing trend every year. Most of the cement pavement is concentrated on rural roads, and in urban road reconstruction projects, it is gradually replaced by white plus black technology. In the process of overlaying old c...

AI Technical Summary

Problems solved by technology

Existing methods for evaluating crack reflection prevention technology mainly include shear fatigue test, bending-tensile fatigue test, etc., which spread the performance of stress-absorbing interlayers from the material aspect of traditional materials. These methods are difficult to simulate the interlayer of composite pavement. Contact, seam vertical bonding problem

At the same time, there is no relevant research on the parameters and equipment for evaluating the stress diffusion performance of the stress-absorbing sandwich structure.

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