钢-聚丙烯混杂纤维增强超高性能混凝土强度试验研究  

Experimental Investigation on Strength of Steel-Polypropylene Hybrid Fiber Reinforced Ultra High Performance Concrete

作　　者：陈倩 徐礼华[1] 吴方红 曾彦钦 梁旭宇 CHEN Qian;XU Lihua;WU Fanghong;ZENG Yanqin;LIANG Xuyu(School of Civil Engineering, Wuhan University, Wuhan 430072, China)

机构地区：[1]武汉大学土木建筑工程学院,武汉430072

出　　处：《硅酸盐通报》2020年第3期740-748,755,共10页Bulletin of the Chinese Ceramic Society

摘　　要：考虑钢纤维体积率、聚丙烯纤维体积率和长径比三种因素,设计并制作了171个超高性能混凝土试块,进行立方体抗压强度、轴心抗压强度和劈裂抗拉强度试验,分析纤维特征参数对超高性能混凝土强度的影响规律。结果表明,掺入钢-聚丙烯混杂纤维后,超高性能混凝土的立方体抗压强度可提高36.3%,轴心抗压强度可提高31.9%,劈裂抗拉强度可提高539%;混杂纤维最佳配比为,钢纤维体积率1.50%、聚丙烯纤维长径比167、体积率0.10%;基于试验结果建立了考虑纤维参数的超高性能混凝土立方体抗压强度预测模型,提出了超高性能混凝土轴心抗压强度、劈裂抗拉强度与立方体抗压强度的关系式。In consideration of three major factors of volume fraction of steel fiber,aspect ratio and volume fraction of polypropylene fiber,171 batches specimens of UHPC were poured.Cubic compressive test,axial compressive test and splitting tensile test were conducted to study compressive and tensile strengths of steel fiber and polypropylene fiber reinforced ultra-high performance concrete,focusing on the effect of fiber parameters on the strengths.Results of the test manifest that cubic compressive strength,axial compressive strength and splitting tensile strength of hybrid fiber reinforced UHPC are significantly improved compared to matrix concrete with the same mixing proportion.The largest increasing amplitudes are as follows:for cubic compressive strength is 36.3%;for axial compressive strength is 31.9%;for splitting tensile strength is 539%.In the studied range,the optimum fiber proportion is steel fiber with a volume fraction of 1.50%and polypropylene fiber with an aspect ratio of 167 and a volume fraction of 0.10%.Strength prediction models of cubic compressive strength and the relations between axial compressive strength,splitting tensile strength and cubic compressive strength of hybrid fiber reinforced UHPC are presented.

关 键 词：超高性能混凝土(UHPC) 钢-聚丙烯混杂纤维 强度试验 强度预测模型 强度转换式 

分 类 号：TU528.572[建筑科学—建筑技术科学]