陶瓷纤维对普通硅酸盐混凝土的强韧化效应

Strengthening and Toughening Effect of Ceramic Fiber on Plain Concrete

采用液压试验机和100mm分离式霍普金森压杆实验装置,研究了体积分数为0.1%、0.2%和0.3%的陶瓷纤维混凝土的准静态和动态力学性能,分析了陶瓷纤维的增强机理,并将其与相同纤维体积分数的碳纤维混凝土进行对比。结果表明:陶瓷纤维改善了普通硅酸盐混凝土的准静态力学性能;纤维体积分数为0.3%时,抗压强度提高15.0%,劈裂抗拉强度提高8.5%,抗折强度提高12.7%。冲击荷载作用下,陶瓷纤维混凝土的动态抗压强度和比能量吸收随平均应变率的增加近似线性增长;体积分数为0.2%时,陶瓷纤维的增强、增韧效果最佳。陶瓷纤维对普通硅酸盐混凝土的增强、增韧效果总体上优于碳纤维。

A hydraulic pressure testing machine and a 100 ram-diameter split Hopkinson pressure bar （SHPB） apparatus are used to investigate the quasi-static and dynamic mechanical properties of ceramic fiber reinforced concrete （CRFRC）,which are compared to those of carbon fiber reinforced concrete （CFRC） at the same vol- ume fractions of 0. 1%,0.2 % and 0.3 %. The strengthening mechanism of ceramic fiber is analyzed. The ex- perimental results show that the ceramic fiber improves the quasi-static mechanical property of plain concrete effectively. When the volume fraction is 0.3 ~, the compressive strength, splitting tensile strength and flexural strength enhance by 15.0% ,8. 5% and 12.7% respectively. The dynamic compressive strength and specific energy absorption of CRFRC are strain rate-dependent under impact load,and the effect can be expressed by linear approximations. The strength and toughness of CRFRC come to the best at the volume fraction of 0.2%. The strength and energy absorption properties of CRFRC are superior to those of CFRC as a whole.