玄武岩纤维活性粉末混凝土动态力学性能试验研究OA北大核心CSTPCD

To investigate the dynamic mechanical properties of basalt fiber reinforced reactive powder concrete(BFRPC),specimens with fiber volume fractions of 0.1%,0.15%,0.20%,0.25%,and 0.30%were prepared using basalt fibers with lengths of 6 mm and 12 mm,respectively.BFRPC impact compression tests were conducted using a 50 mm diameter split Hopkinson pressure bar(SHPB)device to obtain the stress-strain curves of BFRPC.Meanwhile,the effects of basalt fiber volume fraction and impact strain rate on the dynamic compressive strength,critical strain,dynamic strength growth factor,dynamic elastic modulus,and toughness of BFRPC were studied.Based on the BFRPC dynamic stress-strain curves and the Z-W-T model,a dynamic damage constitutive model for BFRPC was established.The results show that the inclusion of basalt fibers can significantly improve the deformation resistance and energy absorption capacity of reactive powder concrete(RPC).Dynamic mechanical properties such as dynamic compressive strength of BFRPC increase approximately linearly with increasing average strain rate;the length of the fibers of 6 mm is better for the improvement of the impact resistance of the BFRPC,and the optimal mixing amount of basalt fibers is 0.2%;the stress-strain curve calculated by the dynamic damage model is consistent with the experimental results,which is suitable for the design of BFRPC impact resistance.The research conclusions provide a theoretical reference for the application of basalt fiber reactive powder concrete.