To determine the softening intrinsic model of rubber concrete,wedge splitting test studies and theoretical analyses were performed on concrete specimens with two seam height ratios and five rubber ad-mixtures.Based on the test results,the fracture toughness and fracture energy of concrete specimens were calculated using the canonical formula and the law of energy conservation,and the relevant parameters of the three softening curves of PETERSSON,Euroconcrete Code,XU and REINHARDT were solved.The theoretical values of cohesive toughness were obtained based on the three softening instantonal relation-ships and compared with the calculated values of cohesive toughness tests.The results show that the soften-ing instability and fracture energy of concrete can be improved by incorporating appropriate amounts of rubber aggregate;the three typical concrete softening models cannot describe the cohesive toughness of rubber concrete well;the softening intrinsic structure model of rubber concrete is obtained by modifying the softening relations of XU and REINHARDT,which can be used to study the cracking resistance of rub-ber concrete materials.
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