Study on mechanical properties of recycled aggregate concrete (II)

Based on the study on the behaviour of recycled aggregate concrete under uniaxial compression, this paper deals with the following other mechanical properties: the uniaxial tensile strength, the splitting tensile strength and the correlationships between them, the flexural strength, the fracture energy and the bond strength between steel reinforcement and recycle aggregate concrete as well as the thermal expansion coefficient and the residual compressive strength after high temperature. It was found that the uniaxial tensile strength, the splitting tensile strength, the flexural strength, the fracture energy and the bond strength all increase with the increase of the cube compressive strength of recycled aggregate concrete. The formulations for the uniaxial tensile strength and the splitting tensile strength as well as the bond strength of normal concrete are also suitable for recycled aggregate concrete. However, the formulations for the flexural strength and fracture energy for normal concrete tend to be unsafe for recycled aggregate concrete. The thermal expansion coefficient of recycled aggregate concrete is about 1 × 10-5 K-1, which is the same as normal concrete. The residual compressive strengths after high temperature for recycled aggregate concrete are somewhat similar to that of light aggregate concrete.