Fixture of test piece for testing inter-laminar drawing fatigue of pavement and testing method thereof

Abstract

The invention relates to a fixture of a test piece for testing inter-laminar drawing fatigue of a pavement and a testing method thereof. At present, no person researches inter-laminar drawing fatigue of a pavement structure at home and abroad. The fixture comprises an upper assembly and a lower assembly which are buckled and sleeved with each other, wherein the upper assembly is a rectangular frame formed by butting a pair of C-shaped plates; the lower end face of the rectangular frame is provided with a lower through hole; vertical ribs are uniformly arranged on the inner side face of the rectangular frame; the lower assembly is a U-shaped frame formed by connecting a pair of same U-shaped frames; the middle part of the upper end face of the U-shaped frame is provided with an upper through hole; the upper through hole and the lower through hole have the same shape; the upper through hole is positioned above the lower through hole and is opposite to the lower through hole; and both sides of the upper end face are provided with grooves which are nested with the ribs and can be in sliding fit with the ribs. After the test piece is fixed by using the upper assembly and the lower assembly, a vertical waveform load is applied to the lower end of the test piece, so that uniform tension stress is produced on a tack coat and a characteristic parameter reflecting drawing fatigue is obtained according to the fatigue tension stress of the test piece and loading times.

Description

technical field [0001] The invention belongs to the technical field of pavement engineering, and relates to a pull-out fatigue experimental device and a test method for a pavement structural layer under repeated loads, in particular to a fixture for testing a pull-out fatigue specimen between pavement layers and its Test Methods. Background technique [0002] The pavement structure is a multi-layer composite system composed of different materials. Due to the difference in materials, the deformation between different structural layers cannot be consistent and coordinated. Therefore, it is generally required to spread sticky oil and permeable layers between the structural layers. It is hoped that the deformation coordination of different structural layers can be achieved through this interlayer bonding measure. Under the action of driving load, the interior of the pavement structure, especially the joint between layers, is prone to large drawing stress and strain. Repeated dr...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a fixture and testing method for testing pavement interlayer pull-out fatigue specimens, to overcome the problem in the prior art that effectively characterizing the inter-layer pull-out fatigue characteristics of pavement structure is to ensure that the road surface can be used normally. Problems to be solved, the method is operable and repeatable, the experimental results are stable, and the discrete results of parallel experiments are small

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