硅灰与再生钢纤维增强自密实混凝土性能研究  

Study on Properties of Self⁃compacting Concrete Reinforced with Silica Fume and Recycled Steel Fibers

作　　者：苗季朋 王庆智 鹿松 王玉全 曾辉 MIAO Jipeng;WANG Qingzhi;LU Song;WANG Yuquan;ZENG Hui(Fourth Engineering Branch of China Communications Third Highway Engineering Bureau Co.,Ltd.,Chongqing401147,China)

机构地区：[1]中交第三公路工程局有限公司第四工程分公司,重庆401147

出　　处：《施工技术（中英文）》2024年第22期55-59,共5页Construction Technology

摘　　要：为研究硅灰与再生钢纤维增强自密实混凝土的力学性能,制备了12组混凝土试样。其中用硅灰替代部分水泥,替代率分别为0,8%和16%(质量比),再生钢纤维按0,0.3%,0.6%和0.9%(体积比)的比例加入到混合料中。通过抗压强度、劈裂抗拉强度、抗弯强度和冲击强度测试混凝土的力学性能。研究结果表明:与未添加硅灰和再生钢纤维的混凝土相比,引入硅灰和再生钢纤维能减少新拌混凝土的流动性,同时提升硬化混凝土的抗压、抗拉、抗弯和抗冲击性能;硅灰和再生钢纤维在自密实混凝土中表现出良好的协同效应,对比硅灰和钢纤维对混凝土的提升效果,硅灰显著增强了混凝土的抗压强度,再生钢纤维则在提升混凝土的抗拉和抗冲击强度方面更有效。To investigate the mechanical properties of self-compacting concrete reinforced with silica fume and recycled steel fibers,12 concrete specimens were prepared.Silica fume was used to partially replace cement at replacement rates of 0,8%,and 16%(by mass),and recycled steel fibers were added at proportions of 0,03%,06%,and 09%(by volume)to the mixture.The mechanical properties of the concrete were tested through compressive strength,splitting tensile strength,flexural strength,and impact strength.The results indicated that the introduction of silica fume and recycled steel fibers reduced the fluidity of fresh concrete while enhancing the compressive,tensile,flexural,and impact resistance of hardened concrete.Silica fume and recycled steel fibers exhibited a good synergistic effect in self-compacting concrete.Compared to the enhancement effects of silica fume and steel fibers on concrete,silica fume significantly improved the compressive strength of concrete,while recycled steel fibers were more effective in enhancing the tensile and impact resistance of concrete.

关 键 词：混凝土 硅灰 再生钢纤维 和易性 力学性能 

分 类 号：TU528[建筑科学—建筑技术科学]