中文摘要：

制备了纤维率为0、1%和2%三种钢纤维掺量的活性粉末混凝土（RPC）试件,利用自行设计的加温装置测试了高温条件下RPC试件的爆裂行为。试验结果表明：在试验条件下,当试件中心温度为250℃左右时,活性粉末混凝土会发生爆裂,与素RPC试件以及高强混凝土相比,掺加钢纤维未能显著提高试件的爆裂温度,但可以降低试件爆裂的破坏程度,钢纤维掺量2%时,这种降低作用更加明显。表明高温条件下钢纤维较好发挥了增韧作用,有效抑制了裂纹的扩展和试件的开裂。

英文摘要：

An experimental study was conducted to investigate the explosive spalling behavior of Reactive Powder Concrete（RPC） at elevated temperature by using self-designed heating device.Three types of RPC specimens were prepared with steel fiber ratio of 0,1%,and 2%,respectively.Results of this paper showed that explosive spalling of RPC occurred when the center temperature was about 250 ℃.Compared with plain concrete or high-strength concrete,the presence of steel fiber had little influence on spalling temperature,but reduced the damage to a certain degree,especially at the fiber ratio of 2%.It was demonstrated that steel fiber helps in increasing ductility by limiting crack growth and propagation.