钢纤维活性粉末混凝土的高温爆裂试验研究  

Explosive spalling of steel fiber reinforced reactive powder concrete subject to high temperature

作　　者：刘红彬[1] 李康乐[1] 鞠杨[1] 王会杰[1] 王金波[1] 田开培[1] 危松[1] 

机构地区：[1]中国矿业大学煤炭资源与安全开采国家重点实验室北京市岩石混凝土破坏力学重点实验室,北京100083

出　　处：《混凝土》2010年第8期6-8,共3页Concrete

基　　金：国家自然科学基金(50974125);北京市教委共建项目;新世纪优秀人才计划(NCET-05-0215);煤炭资源与安全开采国家重点实验室自主课题

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。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.

关 键 词：活性粉末混凝土 高温 爆裂 

分 类 号：TU528.041[建筑科学—建筑技术科学]