Instrument for detecting interlaminar cohesive shear strength of road surface after being soaked

Abstract

The invention discloses a device for detecting the interlaminar cohesive shear strength of a road surface after being soaked, comprising a lower base, a soaking tank, a clamping mechanism used for fixing a test piece, a movable plate and a loading pressure head, wherein the soaking tank is provided with a lower chuck used for fixing the test piece, the soaking tank body is connected with a constant-temperature oven by a thermal insulation pipe to form a constant-temperature water circulation system, the test piece is fixed between an upper chuck and the lower chuck and is completely soaked in a water body, the upper chuck is connected with the movable plate by virtue of a rolling shaft, the loading pressure head arranged above the movable plate is connected with a loading device, and a control system of the loading device realizes data acquisition and control. The device provided by the invention has the advantages that the mechanical structure is reasonable, the degree of automation is high, the operation is simple and convenient, and the interlaminar cohesive shear strength of a road surface after being soaked can be effectively detected, thus the device is applicable to performance study, indoor test and engineering detection on the interlaminar structure of the road surface.

Description

technical field [0001] The invention relates to a shear strength detection test instrument, in particular to a water-immersion shear strength tester for interlayer bonding of pavement. Background technique [0002] With the rapid growth of road traffic volume and the widespread existence of overloading, early damage to expressways in our country occurs frequently. Through the on-site investigation and research on the damaged pavement, it is found that a considerable part of the interlayer bond of the pavement is completely detached or damaged, which directly or indirectly promotes the early damage of the pavement. The pavement interlayer structure is an important part of pavement pavement. Its strength and durability directly affect the overall performance of the pavement. If it is not treated with appropriate treatment methods or high-quality materials, the interlayer joint surface will become a weak Links will cause shear failure on the joint surface, and cause diseases s...

AI Technical Summary

Problems solved by technology

[0003] At present, there is no standard test method for the determination of the shear strength between pavement layers at home and abroad, and there is no unified testing equipment. The shear strength instrument is a direct shear test system developed with reference to the principle of geotechnical testing, but these instruments have inevitable defects, which are specifically manifested in: (1) it cannot simulate the real working state between pavement layers; (2) due to the direct shear mode To apply loads in vertical and shear directions at the same time, the stability of vertical load application needs to be further enhanced; (3) The degree of automation of data acquisition and control systems is not high, and the detection accuracy is limited

At the same time, the existing interlaminar shear strength instruments only consider the shear strength of interlaminar materials under normal conditions, but the research and development of instruments for interlaminar shear strength under water immersion conditions are still blank, which greatly restricts the study of interlaminar materials. and overall evaluation of construction technology, the applicability of the interlayer shear strength detection instrument for pavement needs to be further improved

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