The effects of coarse aggregate grade on the strength and elastic modulus of rubber concrete members were studied based on the material properties test. The bending capacity and deflection of the composite aggregate beam were investigated by three different grades of coarse aggregate rubber concrete beams. The influence of the three rubber concrete beams on the fractal evolution of the damage evolution process under concentrated load. Fractal geometry is used to study the damage evolution process of rubber concrete beams, which provides a new method for health detection and safety assessment of rubber concrete structures.
Alternatively part of the aggregate with rubber granules formulated into rubber concrete (hereinafter referred to as CRC) could reasonably deal effectively with the problem of waste tires, reduce environmental pollution, to expand the application fields of rubber, it is important for the recycling of waste, protecting the environment of [1- 3] . Studies have shown that the mechanical properties of CRC are greatly affected by the particle size, shape and surface roughness of rubber powder [4-5] , but the study on the effect of coarse aggregate level on the mechanical properties of CRC is rarely reported. The coarse aggregate grade has a great influence on the performance of ordinary concrete [6-8] , and its influence on CRC is unknown. In this paper, we use fractal theory [9-13] to study the evolution law of CRC beam bending crack propagation under different loadings, and compare the fractal dimension of surface crack of test beam under different coarse aggregate gradation. The quantitative relationship between the fractal dimension of the surface crack of the test beam and the mid-span deflection of the test beam is investigated, which provides a theoretical basis for the detection, maintenance and nonlinear research of CRC components.
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