钢渣复合矿粉对不同养护条件下混凝土性能的影响  

Influence of Steel Slag Composite Mineral Powder on the Performance of Concrete Under Different Curing Conditions

作　　者：蒋勇[1,2] 廖斌[3] 王小均 邓天宇 蒋俊 杨峰[1] 贾陆军[1] 苏姚彬[1] JIANG Yong;LIAO Bin;WANG Xiaojun;DENG Tianyu;JIANG Jun;YANG Feng;JIA Lujun;SU Yaobin(Mianyang Polytechnic,Mianyang 621000,China;School of Materials and Chemistry,Southwest University of Science and Technology,Mianyang 621000,China;Chongqing Xiangzhong Renewable Resources Co.,Ltd.,Chongqing 401319,China;Chengdu Jingzhun Concrete Co.,Ltd.,Chengdu 610041,China)

机构地区：[1]绵阳职业技术学院,四川绵阳621000 [2]西南科技大学材料与化学学院,四川绵阳621000 [3]重庆祥众再生资源有限公司,重庆401319 [4]成都精准混凝土有限公司,四川成都610041

出　　处：《金属矿山》2024年第5期311-317,共7页Metal Mine

基　　金：四川省自然科学基金项目(编号:2022NSFSC1135);绵阳职业技术学院自然科学重点项目(编号:MZ22ZD01,MZ22ZD02)。

摘　　要：为了探讨利用钢渣和矿渣制备复合掺合料的可行性,按质量比3∶7将钢渣与矿渣进行共同粉磨,制备复合矿粉,研究了复合矿粉对不同养护制度下混凝土的工作性和力学性能的影响,并对水化产物进行了表征。结果表明,复合矿粉使混凝土1 h的坍落度损失下降了6.9%,表现出了较好的保坍效果;在20℃标准养护和60℃蒸汽养护下,掺复合矿粉混凝土的立方抗压和轴向抗压强度与对照组相比均有所提高,但掺复合矿粉混凝土的劈裂抗拉强度均略低于对照组。微观分析发现,复合矿粉的掺入,使得生成的水化硅酸钙氧硅比降低,聚合度增加;水泥石总孔隙率由26.34%下降到23.99%;促进生成更多的水化产物。研究表明,在矿粉中掺入适量的钢渣粉制备复合矿粉具有较高的可行性,是同时实现钢渣和矿渣资源化利用的有效途径。In order to study the feasibility of preparing composite admixtures from steel slag and mineral slag,composite mineral powder was prepared by jointly grinding steel slag and blast furnace slag with mass ratio of 3∶7.The influence of composite mineral powder on the workability and mechanical properties of concrete under different curing conditions was studied,and the hydration products were characterized.The results indicated that the composite mineral powder reduced the loss of slump flow at 1 hour by 6.9%,indicating a good slump retention effect.Under standard curing at 20℃ and steam curing at 60℃,the cubic compressive strength and axial compressive strength of the mixed mineral powder concrete all exceeding the control group.However,the splitting tensile strength of the concrete with composite mineral powder was slightly lower than that of the control group at all temperature curing conditions.Microscopic analysis reveals that the addition of composite mineral powder reduces the O/Si ratio of the hydrated calcium silicate and increases its polymerization degree.Additionally,the overall porosity of the cement paste decreased from 26.34% to 23.99%.Furthermore,this process promotes the formation of more hydration products.The research results show that it is feasible to prepare composite mineral powder by adding appropriate amount of steel slag powder into mineral slag,and it is an effective way to realize resource utilization of steel slag and mineral slag at the same time.

关 键 词：钢渣 复合矿粉 力学性能 水化产物 

分 类 号：TU528[建筑科学—建筑技术科学]