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MnO2掺杂对重构钢渣矿物形成及水化性能影响
作者：韦锦璨1，陈平1，2，3，赵艳荣1，2，3，刘荣进1，2，3
（1.桂林理工大学 材料科学与工程学院，广西 桂林 541004；
2.广西有色金属隐伏矿床勘查及材料开发协同创新中心，广西 桂林 541004；
3.广西工业废渣建材资源利用工程技术研究中心，广西 桂林 541004）
摘要：针对钢渣胶凝活性低、稳定性差等问题，引入钙、铝等调节组分对钢渣进行重构，并添加不同比例的MnO2，利用XRD、EDS、水化热以及活性指数等方法分析，研究MnO2掺杂对重构钢渣矿物形成及力学性能的影响。结果表明：在高温时，掺入MnO2可改善重构钢渣的易烧性，增加掺量效果显著；MnO2的掺入促进了C4AF矿物的形成，降低f-MgO的含量，对C2S的形成影响较小，Mn3+易取代C4AF中的Fe3+形成固溶；MnO2对重构钢渣水化有明显的促进作用，表现为加速期提前，诱导期缩短；胶凝活性指数随着MnO2掺量的增加呈先增大后减小的趋势，当掺量为2.0%时胶凝活性最好，90 d抗压强度为104.95 MPa，活性指数接近100%。
关键词：钢渣；MnO2掺杂；物相重构；水化活性
中图分类号：TU521.4；TU528 文献标识码：A 文章编号：1001-702X（2022）09-0144-05
Effect of MnO2 doping on mineral formation and hydration properties of restructured steel slag
WEI Jincan1，CHEN Ping1，2，3，ZHAO Yanrong1，2，3，LIU Rongjin1，2，3
（1.College of Materials Science and Engineering，Guilin University of Technology，Guilin 541004，China；2.Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi，Guilin 541004，China；3.Guangxi Engineering and Technology Center for Utilization of Industrial Waste Residue in Building Materials，Guilin 541004，China）
Abstract：In this paper，addressing issues of the steel slag cementing，such as low activity and poor stability problem，calcium，aluminum and other components were introduced to reconstruct the steel slag with adding different proportions of MnO2 and analyzed using XRD，EDS，heat of hydration and activity index. And the study focuses on the effect of MnO2 doping on mineral formation and mechanical properties of reconstructed steel slag. The results show that at high temperatures，the doping of MnO2 can improve the ease of burning of reconstituted steel slag，and the effect of increasing the doping is significant. The incorporation of MnO2 promotes the formation of C4AF minerals，reduces the content of MgO，and has little influence on the formation of C2S. Mn3+ is easy to replace Fe3+ in C4AF to form solid solution. MnO2 can obviously promote the hydration of reconstructed steel slag，which shows that the acceleration period is advanced and the induction period is shortened. The gelling activity index increased firstly and then decreased with the increase of MnO2 dosage. When the dosage was 2.0%，the gelling activity was the best，the 90 d compressive strength was 104.95 MPa，and the activity index was about 100%.
Key words：steel slag，MnO2 doping，physical phase reconstruction，hydration activity