Abstract:In order to improve the strength and toughness of high strength lightweight aggregate concrete(HLAC), 05% to 20% volume fraction of micro fine, end hook and corrugated steel fibers were mixed into HLAC respectively. The mechanical properties of steel fiber reinforced high strength lightweight aggregate concrete(SFHLAC) such as compression, splitting tensile, flexural and shear strength were studied. The characteristics of material toughness such as toughness factor and bearing capacity variation coefficient of SFHLAC were also analyzed. The results show that except for the corrugated steel fiber reinforced high strength lightweight aggregate concrete with 20% volume fraction of corrugated steel fiber, the strength and toughness of SFHLAC increase with the increase of the steel fiber volume fraction; the micro fine steel fiber has the best reinforcement and toughening effect on HLAC; the improvement effect of the end hook steel fiber and the micro fine steel fiber on flexural strength of the HLAC is similar, but the improvement of other mechanical strength and toughness is not as good as that of micro fine steel fiber; the effect of corrugated steel fiber on the strength and toughness of HLAC is poor; after comprehensively considering the working performance of the fresh mixture, the recommended volume fraction for engineering applications of three typical steel fibers are given.