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Compression-shear testing device of structural strength and fatigue of composite pavement

A composite pavement and structural strength technology, which is applied in the direction of measuring devices, strength characteristics, and preparation of test samples, can solve the problems of composite pavement structures that lack structural strength and fatigue performance evaluation methods, and achieve easy promotion and use. Scientific and stable results

Pending Publication Date: 2018-03-23
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0006] The purpose of the present invention is to use the existing technology to develop a composite pavement structural strength and fatigue compression shear test device to solve the problem that the composite pavement structure lacks a reasonable structural strength and fatigue performance evaluation method

Method used

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  • Compression-shear testing device of structural strength and fatigue of composite pavement
  • Compression-shear testing device of structural strength and fatigue of composite pavement
  • Compression-shear testing device of structural strength and fatigue of composite pavement

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Embodiment

[0029] Self-made double-layer rut slab test mold, this embodiment takes the semi-rigid base layer flexible surface composite pavement structure sample formed in the room as an example to illustrate, and other composite structure test samples are analogous. Specific steps are as follows:

[0030] (1) Preparation of the base layer of the composite specimen, pouring a semi-rigid inorganic bonding stable material in the lower rutting plate test mold, vibrating and compacting it and placing it for 45 minutes, then performing grooved roughening on the upper surface, and putting it into a standard health care room for health preservation After 7 days, take it out of the health care room after its unconfined compressive strength meets the specification requirements.

[0031] (2) The adhesive layer is made to ensure that the surface of the semi-rigid base is dry and clean, and the upper surface is 1.4kg / m 3 Evenly spread SBS modified asphalt, and immediately continue to evenly spread ...

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Abstract

The invention discloses a compression-shear testing device of structural strength and fatigue of a composite pavement. The structural strength and fatigue life of the composite pavement are evaluatedand estimated through an indoor compression-shear test. The device comprises a loading system, a testing system and a control system, the loading system is a hydraulic servo MTS tester, the testing system sequentially comprises a spherical support, a pressure head, a composite test piece, a clamping ring, a base and an environmental box from top to bottom, the spherical support is meshed with theMTS loading system and the pressure head closely, three-dimensional coordinates of the composite test piece are fixed through the clamping ring and the base, testing temperature and humidity are adjusted through the environmental box, and the composite test piece is loaded by the pressure head; stress data and strain data of the testing process are processed through the control system, and finallycompression-shear testing of the composite test piece can be realized. The device can accurately simulate damage mode and mechanism of a composite pavement structure under traffic load and is of important practical significance and engineering value in guiding design and construction of the composite pavement structure.

Description

technical field [0001] The invention belongs to the field of road engineering and relates to a compression-shear test device for composite road surface structural strength and fatigue. Background technique [0002] There are many combinations of pavement structures, which can be divided into three categories according to the difference in stiffness of the road materials of each layer: fully flexible (full thickness) pavement structure, semi-rigid pavement structure and rigid-flexible composite pavement structure. Among them, semi-rigid pavement structure and rigid-flexible composite pavement structure are collectively referred to as composite pavement structure. Due to the limitation of natural resources and economic conditions in our country, most expressways, urban roads and roads at all levels are composite structures. [0003] Referring to the current regulations in my country, strength and fatigue life are two important indicators of pavement design. There are many test...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/24G01N1/28
CPCG01N1/286G01N3/08G01N3/24G01N2203/0073G01N2203/0026Y02T90/00
Inventor 刘朝晖黄优刘靖宇柳力刘俊豪杨程程许博廖美婕
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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