高强混凝土湿扩散与火灾爆裂关系研究  

Study on relationship between moisture diffusivity and fire spalling of high strength concrete

作　　者：王珩[1] 钱春香[1] 李敏[1] 孙伟[1] 

机构地区：[1]东南大学材料科学与工程系,南京210096

出　　处：《东南大学学报（自然科学版）》2003年第4期454-457,共4页Journal of Southeast University：Natural Science Edition

基　　金：教育部骨干教师计划资助项目;江苏省自然科学基金资助项目 (BK990 16);国家自然科学基金重点资助项目 ( 5 993 8170 )

摘　　要：从爆裂机理研究出发 ,针对高强砂浆等试件 ,利用明火加热炉 ,开展了一系列试验 .发现爆裂与很多因素有关 ,例如随温度的升高和时间的延长 ,爆裂加剧 ;硅灰掺合料会使爆裂更易发生 ;而聚丙烯 (PP)纤维的加入可以抑制爆裂的发生 ,降低爆裂程度 .试验用PCK方法测试了胶砂试件的吸水性 ,并探讨了吸水性和试件爆裂的关系 。From spalling mechanism, a series of experiments with samples aiming at high strength mortar were performed utilizing fuel furnace. The results show that the spalling is related to many factors. For example, with temperature rising or time prolonged, spalling intensify; and spalling is prone to happen when silica fume is added; however, polypropylene (PP) fibre can constrict spalling and reduce the spalling degree. The PCK method was used to measure the water absorption of mortar specimen and the relationship between absorption and spalling was discussed. It is indicated that the specimen with PP fiber, therefore with high water absorption, is not prone to spalling.

关 键 词：高强混凝土 爆裂 湿扩散 吸水性 硅灰 聚丙烯纤维 

分 类 号：TU528.31[建筑科学—建筑技术科学]