钢渣尾泥制备超高性能混凝土  

Preparation of Ultra-High Performance Concrete with Steel Slag Mud

作　　者：于洋 倪文[1,2] 牟欣丽[1,2] 陈志远 YU Yang;NI Wen;MU Xin-li;CHEN Zhi-yuan(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants(University of Science and Technology Beijing),Beijing 100083,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]工业典型污染物资源化处理北京重点实验室(北京科技大学),北京100083

出　　处：《有色金属（冶炼部分）》2023年第5期92-99,144,共9页Nonferrous Metals（Extractive Metallurgy)

基　　金：河北省科技重大专项项目(21283801Z)。

摘　　要：采用机械活化与多固废协同反应技术,利用钢渣尾泥的胶凝性质与细集料特性,协同其他工业固废制备超高性能混凝土(简称UHPC),实现钢渣尾泥的高掺量、高附加值利用。探讨了钢渣尾泥掺量、矿渣与石膏质量比、单方用水量、养护温度等对超高性能混凝土强度性能的影响。结果表明,在钢渣尾泥掺量60%、矿渣和脱硫石膏的质量比4、单方用水量210 kg、养护温度50℃、钢纤维体积掺量5%时,UHPC试块28 d抗压强度可达140 MPa以上,抗折强度可达35 MPa以上。借助X射线衍射(XRD)、傅里叶红外光谱(FT-IR)、热重-差热分析(TG-DSC)测试方法,研究了钢渣尾泥-矿渣-脱硫石膏体系的水化硬化特性,随着反应的不断进行,水化产物钙矾石和C-S-H凝胶强度物质的生成数量不断增长。The technology of mechanical activation and multi-solid waste synergistic reaction is adopted to make use of the cementing properties and fine aggregate properties of steel slag mud and cooperate with other industrial solid waste to prepare ultra-high performance concrete(UHPC),so as to realize the utilization of high dosage and high added value of steel slag mud.Effects of steel slag tailing mud content,mass ratio of slag to gypsum,water consumption,and curing temperature on compressive and flexural strength of ultra-high performance concrete were studied.The results show that the 28 d compressive strength of UHPC test block is 140 MPa above,and the flexural strength is 35 MPa under the conditions including steel slag mud content of 60%,mass ratio of blast furnace slag to desulfurization gypsum of 4,water consumption per cubic meter of 210 kg,curing temperature of 50℃,and the volume content of steel fiber of 5%.By means of X-ray diffraction(XRD),Fourier-infrared spectroscopy(FT-IR)and TG-DSC testing methods,the hydration hardening characteristics of steel slag mud-blast furnace slag-desulfurization gypsum system have been studied.With the continuous development of the reaction,the amount of hydration products ettringite and C-S-H gel strength substance is increasing.

关 键 词：钢渣尾泥 UHPC 正交试验 钙矾石 C-S-H凝胶 

分 类 号：X757[环境科学与工程—环境工程]