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镍渣对超高性能混凝土力学性能的影响研究
作者：杨腾宇1，舒本安1，任彦飞1，郑礼尚1，丁庆军2，解鹏洋3
（1.佛山市交通科技有限公司，广东 佛山 528315；2.武汉理工大学，湖北 武汉 430070；
3.中国新型建材设计研究院有限公司，浙江 杭州 310022）
摘要：利用球磨与气流磨对镍渣进行细化处理，制得镍渣粉QFS和LFS，分别采用QFS等质量取代粉煤灰、LFS等质量取代硅灰制备超高性能混凝土，研究了细化镍渣对超高性能混凝土工作性能、力学性能、干燥收缩、孔结构及微观结构的影响。结果表明：LFS取代硅灰在一定程度上改善了混凝土工作性能，但不利于力学性能；相比LFS体系，QFS取代粉煤灰表现出相反的性能趋势；LFS和QFS复合使用全部取代硅灰和粉煤灰的情况下，超高性能混凝土的28 d抗压强度可达148.8 MPa，表现出优良的性能。
关键词：超高性能混凝土；镍渣；干燥收缩；孔结构
中图分类号：TU528.041 文献标识码：A 文章编号：1001-702X（2022）08-0121-04
Effect of nickel slag on mechanical properties of ultra-high-performance concrete
YANG Tengyu1，SHU Benan1，REN Yanfei1，ZHENG Shangli1，DING Qingjun2，XIE Pengyang3
（1.Foshan Transportation Technology Co. Ltd.，Foshan 528315，China；2.Wuhan University of Technology，Wuhan 430070，China；
3.China New Building Materials Design and Research Institute Co. Ltd.，Hangzhou 310022，China）
Abstract：Nickel slag powder QFS and LFS was refined by ball mill and jet mill，respectively. Ultra-high performance concrete（UHPC） was prepared by replacing fly ash with QFS and silica fume with LFS with the same mass，respectively. The effects of refined nickel slag on workability，mechanical properties，drying shrinkage，pore structure and microstructure of UHPC were studied. The results show that LFS can improve concrete workability to a certain extent，but it is not good for mechanical properties. The performance of UHPC with QFS exhibited opposite trend compared to LFS system. When LFS and QFS are used to fully replace silica fume and fly ash，the compressive strength of ultra-high performance concrete can reach 148.8 MPa at 28 d，showing excellent performance.
Key words：ultra-high-performance concrete，nickel slag，dry shrinkage，pore structure