Abstract:In order to reveal the mechanical properties of short age recycled coarse aggregate concrete under tri axial compression, 14 cylinder specimens were designed for tri axial compression test. Aging time and lateral confinement were considered as variables in the test. Failure patterns of specimens were observed, peak stress, peak strain, elastic modulus and stress strain curves were obtained. Based on the experimental data, the influence of aging time and lateral confinement on the mechanical properties of short age recycled coarse aggregate concrete under tri axial compression were analyzed; the strength calculation methods were discussed; the formulas of elastic modulus, peak strain, peak stress and stress strain constitutive equation were put forward. Results show that: aging time has a great influence on peak strain and elastic modulus; on the other hand, peak stress, peak strain and elastic modulus of recycled coarse aggregate concrete are significantly influenced by lateral confinement. The calculated results by CEB FIP(1990) are in good agreement with experimental data.