EXPERIMENTAL STUDY ON THE COMPRESSION PERFORMANCE OF RECYCLED AGGREGATE CONCRETE COLUMNS

In this paper,the compression behaviors of 12 concrete columns with different replacement percentages of recycled coarse aggregate and 500 MPa grade reinforcement were experimentally investigated. Failure modes, component lateral deflection curve,concrete strain,steel strain and other features of recycled concrete columns were analyzed. The bearing capacity of experiment was compared with code for design of concrete structures. The results show that the failure process and mode,cross-lateral deflection curves,concrete strain,steel strain of the recycled concrete column and ordinary concrete are not different significantly,and the replacement rate has little effect on the bearing capacity of column. The compression bearing capacity calculated by code for Design of Concrete Structures (GB 500102010) is in good agreement with the experimental results. 500 MPa grade reinforcement in recycled concrete columns work with better performance,and its tensile and compressive strength can be fully realized. In the compression bearing capacity calculations, tensile and compressive strength design values of 500 MPa grade reinforcement in GB 500102010 values have provided a greater safety margin.