含碎红砖再生混凝土基本力学性能及其应力-应变关系

It is almost impossible to exclude the waste brick from the waste concrete in the production of recycled coarse aggregates. The crushed clay bricks (CCB) has significant influence on the mechanical behavior of the RAC. Taking the CCB replacement ratio as the main test parameter, this paper quantified the influence of the CCB on the compressive strength, the elastic modulus, and other mechanical behaviours (e.g. the peak strain, the ductility, the dilation ratio, etc.) of the RAC based on the cubic and prism test results. Introducing the CCB replacement ratio as a key parameter, the available stress-strain equation for RAC had been modified to account for the influence of CCB. The model equations were benchmarked against available experimental results. It is found that the CCB would significantly increase the peak strain and the Poisson's ratio, decrease the strength, and cause significant increase of dilation ratio at a relatively lower load level.