Meso-fracture mechanical analysis method for high-volume rubber concrete

Abstract

The invention discloses a meso-fracture mechanical analysis method for high-volume rubber concrete. The method comprises the steps of preparing a test piece, pretreating the test piece, scanning a sample slice, simulating a meso-structure of the test piece, and analyzing and comparing a real test and a simulation experiment. Cubic test pieces with different rubber mixing amounts are prepared through reasonable raw material proportioning; the test piece is pretreated, so that the test piece can be conveniently scanned by a full-automatic panoramic fluorescence microscope; therefore, the porosity of the concrete is convenient to observe; the influence of the doping amount of the rubber on the mechanical property of the rubber concrete is analyzed based on the microstructure; the microstructure of the test piece is simulated according to the scanning image of the sample slice and a rubber concrete microstructure model is generated; the real test of the test piece is analyzed and comparedwith the simulation test of the time microstructure model, so as to analyze the influence of the doping amount of the rubber on the macroscopic fracture performance of the rubber concrete based on themicrostructure; and the method has better applicability and accuracy.

Description

technical field [0001] The invention relates to the technical field of material performance analysis, in particular to a method for analyzing mesoscopic fracture mechanics of large-volume rubber concrete. Background technique [0002] Rubber concrete is a concrete formed by mixing and curing rubber emulsion and auxiliary admixtures with cement when preparing cement mortar or concrete. It has excellent impact resistance and wear resistance, and can better solve the problem of recycling waste rubber products. Compared with ordinary concrete, rubber concrete has better performance in terms of abrasion resistance, crack resistance, seepage resistance, frost resistance, and earthquake resistance, and can effectively reduce the use of natural aggregates and the accumulation of waste rubber products. It has a good application prospect in engineering, but with the increase of rubber content, the strength of rubber concrete continues to decrease, which limits its engineering applicat...

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Problems solved by technology

[0002] Rubber concrete is a concrete formed by mixing and curing rubber emulsion and auxiliary admixtures with cement when preparing cement mortar or concrete. It has excellent impact resistance and wear resistance, and can better solve the problem of recycling waste rubber products. Compared with ordinary concrete, rubber concrete has better performance in terms of abrasion resistance, crack resistance, seepage resistance, frost resistance, and earthquake resistance, and can effectively reduce the use of natural aggregates and the accumulation of waste rubber products. It has good application prospects in engineering, but with the increase of rubber content, the strength of rubber concrete continues to decline, which limits its engineering application to a certain extent;

[0003] In order to promote the popularization and application of large-volume rubber concrete in water conservancy, civil engineering, transportation and other practical projects, it is necessary to analyze the fracture performance of rubber concrete to reveal the mechanism of rubber concrete fracture performance and prolong the service life of rubber concrete structures. There are few analyzes on the fracture process mechanism of large-volume rubber concrete, and most of the analysis results are not representative, because the macroscopic performance of material properties is often inseparable from its mesomechanics, and mesoscopic numerical simulation can effectively reflect the structure under load. Deformation and cracking state under action, therefore, the present invention proposes a kind of large-volume rubber concrete mesoscopic fracture mechanics analysis method to solve the problems existing in the prior art

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