冻融疲劳作用下LHFRC损伤演变规律  

Research on the Damage Evolution for LHFRC Subjected to Freeze-thaw Cycles

作　　者：贺东青[1] 卢哲安[2] 任志刚[2] 张宇 

机构地区：[1]河南大学土木建筑学院,开封475001 [2]武汉理工大学湖北省道路桥梁与结构工程重点实验室,武汉430070 [3]湖北省黄冈市建设工程质量监督站,黄冈437000

出　　处：《武汉理工大学学报》2007年第7期92-94,129,共4页Journal of Wuhan University of Technology

基　　金：国家<纤维混凝土结构技术规程>资助项目(建标协字第15号)

摘　　要：为了研究层布式混杂纤维混凝土(LHFRC)在冻融疲劳作用下的损伤演变规律,提出了混凝土抗冻劣化的损伤演变数学模型,同时进行了普通混凝土(OC)与层布式混杂纤维混凝土的冻融试验,并在试验的基础上,回归出它们的冻融损伤演变方程。结果表明,LHFRC和OC的初劣点值相同,且在劣化初始阶段具体相同的损伤演变方程;在劣化扩展阶段,LHFRC和OC均具有幂函数形式的损伤演变方程,但LHFRF损伤变量小于同期的OC,钢纤维和聚丙烯纤维有效地抑制了其内部损伤发展。In order to study the damage evolution law for LHFRC subjected to freeze-thaw cycles, the damage evolution mathematic model for the frost resistance degradation of concrete was offered in this paper, and based on freeze-thaw experiments for original concrete OC and layer hybrid fiber reinforced concrete, the freeze-thaw damage evolution equation for original concrete and layer hybrid fiber reinforced concrete were regressed. It was concluded that OC and LHFRC had the same initialdegenerate point as well as the damage evolution regression equation in the degradation preliminary stage, and they had the power function damage evolution regression equation but the LHFRC＇s damage variable was smaller than the OC＇s at the same time, Furthermore, layer steel fibers and polypropylene fibers had effectively retarded the degradation of concrete.

关 键 词：损伤演变 层布式混杂纤维混凝土 冻融试验 

分 类 号：TU528.57[建筑科学—建筑技术科学]