Experimental device for asphalt rotational shear failure

Abstract

The invention discloses a pitch rotation shear failure experimental device and belongs to the test field of material mechanics properties. The pitch rotation shear failure experimental device comprises an experimental platform, a temperature control system and a computer control system. The computer control system is capable of automatically controlling loading facilities to carrying out rotating shear loading to experimental test specimen and controlling an experimental process. The temperature control system is capable of controlling temperatures of the experiment. The pitch rotation shear failure experimental device can be suitable for determining low-temperature brittle failures and middle-high-temperature viscoplasticity failures of asphalt cements such as ordinary pitch, SBS modified asphalt, rubber asphalt and other polymer modified asphalt under different shear rates and tests of cementation interface mechanical property of materials such as bitumen mastic materials, stones, steels and plastic under the low-temperature conditions.

Description

technical field [0001] The invention belongs to the field of testing mechanical properties of asphalt, and in particular relates to an experimental measurement technology for asphalt rotational shear failure strain, failure stress index and bonding interface failure performance. Background technique [0002] The main equipment for testing the failure performance of asphalt binder is the direct tensile tester (DDT), which measures the failure strain and failure stress of the asphalt specimen under direct tension. Asphalt is often damaged by shearing. [0003] The only equipment that applies shear to asphalt binder to test its mechanical properties is the dynamic shear rheometer (DSR), which measures the complex shear modulus of asphalt binder in the linear viscoelastic range at a given temperature and loading frequency. Quantity (G * ) and phase angle (δ), which are used to evaluate the high temperature resistance to permanent deformation and medium temperature fatigue resi...

AI Technical Summary

Problems solved by technology

The above-mentioned torsion test equipment is not suitable for the test of the rotational (ie torsion) shear failure performance of asphalt binder. The main reasons are: (1) The mechanical properties of asphalt binder are not only significantly affected by the loading rate, but also very sensitive to the test temperature , therefore, the testing process for the destructive performance of asphalt binder must strictly control the loading rate and test temperature; (2) The shear modulus and destructive strength of asphalt binder are much smaller than that of metal materials, and the torque of the existing material torsion testing machine The measurement range of the sensor is relatively too large, which makes it difficult to guarantee the accuracy of the experiment; (3) Due to the low hardness of the asphalt material, a special fixture must be used to carry out the shear loading test; (4) In order to reflect the damage performance of the bonding interface between asphalt and different materials, it is necessary to Special trial molds made of different materials and matched with the clamping system

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