钢纤维对超高性能混凝土性能的影响  

Effect of steel fiber on properties of ultra high performance concrete

作　　者：王成启[1] 郭玉林 梁远博[1] WANG Cheng-qi;GUO Yu-lin;LIANG Yuan-bo(CCCC Shanghai Third Harbor Engineering Science and Technology Research Institute Co.,Ltd.,Shanghai 200032,China)

机构地区：[1]中交上海三航科学研究院有限公司,上海200032

出　　处：《水运工程》2022年第9期22-26,34,共6页Port & Waterway Engineering

摘　　要：钢纤维的几何尺寸是超高性能混凝土(UHPC)的增强和增韧的关键因素。采用不同长径比的钢纤维,通过试验研究钢纤维长径比对UHPC的工作性能和力学性能,并分析钢纤维长径比对UHPC的影响机理。结果表明,随着钢纤维长径比的增加,UHPC的坍落度和扩展度均不断降低,含气量增大;随着钢纤维长径比的增加,UHPC的抗压强度、抗折强度、弯曲韧性系数和抗冲击性能均不断增加,但增加幅度呈现不断降低趋势;钢纤维的长径比宜控制在60~100,可配制出工作性和力学性能优异的UHPC。该UHPC在某码头工程桩基修复加固中获得应用,取得了良好的应用效果。The geometric dimension of steel fiber is a key factor for the reinforcement and toughening of ultra high performance concrete(UHPC).In this paper,the working and mechanical properties of UHPC with different length diameter ratio are experimentally studied,and the influence mechanism of steel fiber length diameter ratio on UHPC is analyzed.The results show that with the increase of the length diameter ratio of steel fiber,the slump and expansion of UHPC continue to decrease and the gas content increases.With the increase of steel fiber aspect ratio,the compressive strength,flexural strength,flexural toughness coefficient and impact resistance of UHPC are increasing,but the increasing range shows a decreasing trend.The length diameter ratio of steel fiber should be controlled at 60~100,and UHPC with excellent construction and mechanical properties can be prepared.The developed UHPC has been applied in the repair and reinforcement of pile foundation of a wharf project and achieved good application results.

关 键 词：超高性能混凝土(UHPC) 钢纤维 长径比 工作性能 力学性能 

分 类 号：TU528[建筑科学—建筑技术科学] U654[交通运输工程—港口、海岸及近海工程]