Rotary shear failure performance determination test device of asphalt mixture

Abstract

The invention provides a rotary shear failure performance determination test device of an asphalt mixture and belongs to the technical field of mechanical property testing of the asphalt mixture. The rotary shear failure performance determination test device is composed of a testing platform, a loading system and a computer control system, wherein the loading system is used for carrying out rotary shearing loading on an asphalt mixture test piece according to a set shearing speed; the computer control system collects data information in real time; and a rotary shearing method is adopted to test a shear failure performance of the asphalt mixture. The rotary shear failure performance determination test device disclosed by the invention has the advantages that (1) a rotation torque acting on the test piece with an axially-symmetrical section only generates pure shearing deformation and a simple pure shearing stress state can be obtained, so as to be convenient for testing and controlling the maximum shearing stress and strain; (2) due to an axial symmetry property, the testing accuracy can be improved in theory; and (3) testing equipment and a testing process of rotary loading occupy a small testing space; and compared with pulling and pressing deformation, the rotary shearing deformation (angle displacement) can be infinitely great in theory and is basically not limited by the testing space, so that the rotary shear failure performance determination test device is particularly suitable for materials with great plastic failure deformation.

Description

technical field [0001] The invention belongs to the technical field of mechanical performance testing of asphalt mixture, in particular to a technique for measuring the rotational shear failure strain and failure stress index of asphalt mixture. Background technique [0002] Due to the surge in traffic volume and vehicle overloading, rutting has long been one of the main diseases of asphalt pavement. Relevant studies have shown that the shear strength of asphalt mixture at high temperature is not enough to resist the repeated action of wheel load, so that asphalt concrete produces plastic shear deformation, and is gradually squeezed to both sides, forming lateral rheology and rutting; In the process of asphalt pavement design, the shear resistance of asphalt mixture is not considered. Once the shear stress of the material is greater than or close to the shear strength, the pavement will be sheared. Therefore, it is of great significance to study the shear performance of asp...

AI Technical Summary

Problems solved by technology

[0009] In summary, the shear test methods mentioned above have the following common points: (1) The specimens generally undergo shear failure under complex stress state; (2) The shear failure surface is a plane, but the stress distribution on the plane is Inhomogeneous, and the distribution of maximum shear stress is also inhomogeneous

Although the complex stress state is closer to the actual working state of the pavement, the inhomogeneity, asymmetry and incompatibility of the shear stress distribution on the failure surface along the loading direction will affect the test accuracy

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