Dynamic compressive behavior of ceramic fiber reinforced concrete under impact load

摘要

Dynamic properties of ceramic fiber reinforced concrete (CRFRC) are investigated using a 100-mm-diam-eter split Hopkinson pressure bar (SHPB) system. Different ways of choosing strain rate were adopted to express the strain rate effects on dynamic compressive stress, elastic modulus and impact toughness of CRFRC. The results show that the dynamic compressive strength and impact toughness increase with strain rate, while the elastic modulus decrease with strain rate. The addition of ceramic fiber can significantly improve the dynamic strength and elastic modulus of concrete. 0.1% and 0.2% volume fraction of ceramic fiber improve the impact toughness at higher strain rate. And the optimum volume fraction of ceramic fiber is 0.2%. The dynamic damage model was established based on the improved parallel bar system (IPBS) model. The result reveals that the model can well describe the relation between stress and strain of CRFRC.