Preparation device and preparation method for DSR (Dynamic Shear Rheometer) biplate test piece and damage-healing assessment method for bituminous material

Abstract

The invention discloses a preparation device and a preparation method for a DSR (Dynamic Shear Rheometer) biplate test piece and a damage-healing assessment method for a bituminous material. The preparation device comprises a knockout rod, an upper test die and a lower test die, wherein the upper test die comprises an upper die body and an upper bottom die; the lower test die comprises a lower diebody and a lower bottom die; a first circular boss is arranged on the lower surface of the upper bottom die; a second circular boss is arranged on the upper surface of the lower bottom die. The preparation device and the preparation method can realize preparation of the DSR biplate test piece; the preparation device is simple in structure and is convenient to operate; the assessment method can effectively assess the interfacial healing effect between different bituminous materials and can reflect the influence of healing time on healing effect.

Description

technical field [0001] The invention belongs to the field of asphalt material performance detection, and relates to a DSR double-sheet test piece preparation device and method and an asphalt material damage-healing evaluation method. Background technique [0002] The damage self-healing ability of asphalt materials refers to the ability of the materials to partially or completely restore the strength and stiffness of the materials and prolong the fatigue life of asphalt pavement under certain conditions. It is considered to be an important factor for asphalt materials to resist fatigue cracking. At present, the test methods and indicators used to evaluate the damage-healing ability of asphalt materials are insufficient, and it is difficult to directly reflect the damage-healing ability of asphalt materials. [0003] Dynamic Shear Rheometer (DSR) is a basic instrument for studying viscoelastic materials. Because the US Strategic Highway Research Program (SHRP) used DSR for th...

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Problems solved by technology

[0005] 1. The preparation of DSR double-piece specimens is cumbersome and the preparation equipment is relatively complicated;

[0006] 2. In the prior art, the recovery of the stiffness modulus of the specimen is generally used to evaluate the damage healing level of the asphalt mixture, but some studies have shown that the recovery of the material stiffness modulus does not mean that the strength of the mixture is increased and the fatigue life is extended to the same extent. , so the evaluation of the damage-healing ability of asphalt materials remains to be verified

[0007] 3. The existing technology does not reflect the influence of different healing times on the healing effect in the evaluation index of injury-healing ability

[0008] 4. The existing technology does not consider the interface healing effect between different materials

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