Semi-flexible asphalt concrete interface phase fretting fatigue test device and method

Abstract

The invention relates to a semi-flexible asphalt concrete interface phase fretting fatigue test device and method. The method and the device are used for carrying out a fatigue test on a composite test piece, the composite test piece comprises a cement block, asphalt and a stone block which are sequentially connected from top to bottom, the device comprises an MTS test machine, a monitoring terminal, a clamp and a substrate, the clamp comprises a test piece upper die and a test piece lower die, the composite test piece is clamped between the test piece upper die and the test piece lower die, the test piece lower die is obliquely arranged on the substrate through the wedge block, the substrate is provided with the shear displacement measuring assembly and the fixed blocking piece, the wedge block is clamped between the fixed blocking piece and the test piece lower die, and the shear displacement measuring assembly comprises a linear differential strain sensor. The sensing tip of the linear differential strain sensor is in contact with the side face, facing the inclined direction, of the cement block, and the MTS test machine and the linear differential strain sensor are connected with the monitoring terminal. Compared with the prior art, the method can be used for accurately and comprehensively measuring the micro-motion effect and the fatigue performance of the interface phase of the semi-flexible asphalt concrete.

Description

technical field [0001] The invention relates to the technical field of road engineering, in particular to a semi-flexible asphalt concrete interface phase fretting fatigue test device and method. Background technique [0002] Semi-rigid base asphalt pavement is the main form of highway in our country. Rutting and other diseases often occur on channelized traffic sections such as toll stations and parking lots due to insufficient deformation resistance. Semi-flexible asphalt concrete uses large-pore asphalt mixture as the matrix and fills cement mortar materials to form a flexible matrix-rigid intervening composite material. Due to the characteristics of large modulus, high fatigue life and strong rutting resistance, semi-flexible asphalt concrete is mostly used for the pavement surface layer of channelized traffic sections, which reduces the frequency and workload of pavement maintenance and achieves good economic and social benefits. Compared with traditional asphalt concr...

AI Technical Summary

Problems solved by technology

However, asphalt and cement mortar are phase-changing materials. Asphalt has viscoelasticity and plasticity, and cement mortar has fluidity at room temperature. Although in the test of material properties, the two will often condense or harden, forming a However, when studying the fatigue characteristics of the interface, the two are still in non-solid contact at the interface, and the fatigue test device for solid contact is not suitable for the fatigue test of the asphalt-cement mortar interface phase;

[0007] 2) The loading direction of the interface is single and unreal;

[0009] 3) The application period of fatigue load cannot simulate the fretting frequency generated by traffic load;

[0010] The load period applied by the existing interface fatigue test device is set considering the service characteristics of concrete or steel itself, and it is not suitable for semi-flexible asphalt concrete to simulate the frequency characteristics of traffic loads

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