低碳超高强石渣混凝土的抗火性能研究  

Experimental studies on the fire behavior of green super high strength concrete used stone-chip at elevated temperature

作　　者：陈国灿[1,2] 

机构地区：[1]中南大学防灾科学与安全技术研究所,长沙410075 [2]莆田学院土木建筑工程学系,福建莆田351100

出　　处：《武汉工程大学学报》2010年第11期36-41,共6页Journal of Wuhan Institute of Technology

基　　金：福建省自然科学基金计划资助项目(基金项目编号:2007J0163);莆田市科技计划资助项目(2007G26);莆田学院资助项目(JG200721)

摘　　要：为了研究纤维类型、高温对超高强石渣混凝土抗火性能的影响,以温度、纤维类型为试验参数,进行了低碳超高强石渣混凝土的抗火性能试验.试验结果表明,超高强石渣混凝土、掺入钢纤维的超高强石渣混凝土的抗火性能均较差,400℃高温下爆裂;而掺入聚丙烯纤维的超高强石渣混凝土显示较好的抗爆裂性能;无论掺入纤维与否,高温后超高强石渣混凝土均显示出与普通混凝土、高强混凝土、高性能混凝土迥然不同的力学特性:温度低于360℃时,超高强石渣混凝土的抗压强度随温度的上升而增大,360℃时抗压强度达到常温时的1.47倍;掺钢纤维的超高强石渣混凝土的抗压强度在320℃之前随着温度的升高而增长,320℃时抗压强度达到常温时的1.33倍,之后呈现下降的趋势;而掺聚丙烯纤维的超高强石渣混凝土的抗压强度在400℃之前随温度的升高而略有提高,400℃时抗压强度为常温时的1.07倍,之后便随温度的升高而降低;最后分析了高温后超高强石渣混凝土抗压强度随温度变化的机理.In order to study the influence of temperature and fiber type on the fire behavior of green super high strength concrete used stone-chip（abbreviated to GSHSCUS） at elevated temperature,a series of experiments on the fire behavior of GSHSCUS with the two different parameters including temperature and fiber type were carried out in the laboratory.Experimental results show that,GSHSCUS has a weak refractory performance as well as GSHSCUS mixed with the steel fiber,with about 400 ℃ of cracking temperature,and that GSHSCUS mixed with polypropylene fiber exhibits excellent resistance to high temperature,and that after the high temperature all of them show distinguished characteristic different from that of ordinary concrete.HSC or HPC,namely the strength of GSHSCUS increases with the elevated temperature under 360 ℃ at which strength is as high as 1.47 times of that at room temperature,and that of GSHSCUS mixed with the steel fiber also appears the same trend by 320 ℃ at which strength is 1.33 times of that at room temperature,then on the decrease,and GSHSCUS mixed with the polypropylene fiber show slowing growth of strength by 400 ℃ at which strength is 1.07 times of that at room temperature,then keeps declining.The mechanism of the strength changing with elevated temperature is also analyzed.

关 键 词：低碳超高性能石渣混凝土 高温性能 抗压强度 抗爆裂性能 

分 类 号：TU528.31[建筑科学—建筑技术科学]