聚丙烯纤维对超高强混凝土断裂特性的影响  

Effects of Polypropylene Fibres on Fracture Energy Properties of Ultra High Strength Concrete

作　　者：漆贵海[1,2] 彭小芹 叶浩文[3] 董艺 

机构地区：[1]重庆大学材料科学与工程学院,重庆400045 [2]贵州中建建筑科研设计院有限公司,贵州贵阳550006 [3]中国建筑第四工程局有限公司,广东广州510665

出　　处：《建筑材料学报》2015年第3期487-492,共6页Journal of Building Materials

基　　金："十二五"国家科技支撑计划项目(2011BAJ03B10);贵州省重大科技专项项目(黔科合重大专项字[2012]6024号)

摘　　要：通过三点弯曲梁试验研究了聚丙烯纤维掺量和种类对抗压强度>100MPa的超高强混凝土断裂性能的影响.结果表明:超高强混凝土裂缝破坏过程分为3个阶段.聚丙烯纤维对延缓超高强混凝土第1阶段和第2阶段裂缝破坏发展有一定的效果,但效果不明显.聚丙烯纤维对延缓超高强混凝土第3阶段裂缝破坏发展效果明显.与未掺聚丙烯纤维超高强混凝土相比,掺2kg·m-3长度19mm聚丙烯纤维的超高强混凝土断裂能增加50.8%,韧性提高54.5%,各龄期抗压强度增大,而掺2kg·m-3长度9mm聚丙烯纤维的超高强混凝土断裂能增加45.5%,韧性提高29.4%,各龄期抗压强度降低.The effect of polypropylene fibres（PP fibres）on fracture properties of ultra high strength concrete（UHSC）,which has compressive strength of more than 100 MPa,were studied by the method of three-point bending beam test.The results show that the development of crack in UHSC can be defined in three stages,and PP fibres are more effective to prevent the development of crack in third stage than in first and second stages.Compared to the UHSC without PP fibres added,the fracture energy and toughness of UHSC with 2kg·m-3 PP fibres of length of 19 mm added are increased by 50.8% and 54.5%respectively,the compressive strengths at different ages are also increased,and the fracture energy and toughness of UHSC with 2kg·m-3 PP fibres of length of 9mm added are increased by 45.5%and 29.4%respectively,but the compressive strengths at different ages are decreased.

关 键 词：聚丙烯纤维 断裂能 脆性 裂缝破坏发展 超高强混凝土 

分 类 号：TU528.572[建筑科学—建筑技术科学]