活性粉末混凝土在多次冲击荷载下的力学行为

采用60％的超细工业废渣取代水泥制备了抗压强度达200 MPa的生态型活性粉末混凝土（RPC），采用分离式霍普金森压杆装置对不同纤维掺量的RPC材料进行了4种方式的多次冲击压缩实验。定义了材料多次冲击压缩标准化强度，揭示了冲击次数、冲击方式、纤维掺量对材料抗多次冲击性能的影响规律。研究表明随着纤维掺量的提高，材料抗多次冲击的能力不断提高。随着冲击次数的增加，材料的损伤程度不断增大，标准化强度不断下降。随着冲击方式的改变，材料首次冲击的损伤增加，第2次和第3次冲击下材料峰值应力下降速度提高。

Dynamic mechanical behaviour of reactive powder concretesubjected to repeated impact

Reactive powder concrete (RPC) with a compressive strength of 200MPa was prepared by substitution of ultra-fine industrial waste powders for 60% cement by weight. The dynamic mechanical behaviour of RPC with different fiber volume fraction was researched on repeated compressive impact in four kinds of impact modes with the split Hopkinson pressure bar. Standard strength of repeated impact was defined. The effects of impact times, impact modes and fiber volume fraction on the properties of RPC subjected to repeated impact were explored. Results show that the ability of repeated impact resistance of RPC is increases with fiber volume fraction. With the increase of impact times, the damage of material increases and the standard strength decreases. With the change of impact modes, the damage of material on the first impact and the reduction rates of the peak stresses on the second and third impact increase.