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Numerical simulation of recycled concrete based on convex aggregate model and base force element method

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Document pages: 10 pages

Abstract: Based on the basic force element method (BFEM) based on the principle of potential energy, a new concrete numerical model, random convex aggregate model, is proposed to simulate the uniaxial compression test of recycled concrete (RAC). The model is regarded as a heterogeneous composite composed of five media: natural coarse aggregate, old mortar, new mortar, new interface transition zone (ITZ) and old interface transition zone (ITZ). In order to simulate the damage process of Rac, the curve damage model is used as the damage constitutive model, and the maximum tensile strain strength theory is used as the failure criterion of micromechanics BFEM. The numerical results obtained in this paper included the uniaxial compressive strengths, size effects on strength, and damage processes of RAC are in agreement with experimental observations. The research works show that the random convex aggregate model and the BFEM with the curve damage model can be used for simulating the relationship between microstructure and mechanical properties of RAC.

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