EXPERIMENTAL STUDIES OF FLEXURAL STRENGTH AND MECHANICS PERFORMANCE FOR RECYCLED CONCRETE BEAM

摘要

The intent of this paper is to investigate the flexural behavior of 4 recycled concrete simply-supported beams with same percentage of reinforcement and axial compressive strength but different replacement ratio of recycled aggregates. Besides the flexural capacity of normal section, the characteristics of both deflection and cracking are analyzed. Based on the experimental results, the following conclusions are drawn. In bending, the recycled concrete beam also has elastic, cracking, yield and ultimate point. The average strain measured on cross-section obliges to the plane section assumption. Under the same conditions, the cracking and ultimate moment of recycled concrete beam are similar to conventional concrete beam. After verifying the formula suggested by present code for Design of Concrete Structures(GB50010-2002) for recycled concrete beams, a conclusion can be drawn that the ultimate moment of recycled concrete beam can be estimated by the formula suggested by present code, whereas the cracking moment, the deflection and the width of crack can not.