Liu Yiliang, Su Youpo, Xu Guoqiang, Chen Yanhua, You Gaoshuai
Deparment of Mining Engineering, North China University of Science and Technology, Tangshan 063210, China.
Department of Architectural Engineering, North China Institute of Aerospace Engineering, Langfang 065099, China.
Materials (Basel). 2022 Jan 19;15(3):727. doi: 10.3390/ma15030727.
Increasing global cement and steel consumption means that a significant amount of greenhouse gases and metallurgical wastes are discharged every year. Using metallurgical waste as supplementary cementitious materials (SCMs) shows promise as a strategy for reducing greenhouse gas emissions by reducing cement production. This strategy also contributes to the utilization and management of waste resources. Controlled low-strength materials (CLSMs) are a type of backfill material consisting of industrial by-products that do not meet specification requirements. The preparation of CLSMs using metallurgical waste slag as the auxiliary cementing material instead of cement itself is a key feature of the sustainable development of the construction industry. Therefore, this paper reviews the recent research progress on the use of metallurgical waste residues (including blast furnace slag, steel slag, red mud, and copper slag) as SCMs to partially replace cement, as well as the use of alkali-activated metallurgical waste residues as cementitious materials to completely replace cement for the production of CLSMs. The general background information, mechanical features, and properties of pozzolanic metallurgical slag are introduced, and the relationship and mechanism of metallurgical slag on the performance and mechanical properties of CLSMs are analyzed. The analysis and observations in this article offer a new resource for SCM development, describe a basis for using metallurgical waste slag as a cementitious material for CLSM preparation, and offer a strategy for reducing the environmental problems associated with the treatment of metallurgical waste.
全球水泥和钢铁消费量的不断增加意味着每年都会排放大量温室气体和冶金废物。将冶金废物用作辅助胶凝材料（SCMs），有望通过减少水泥生产来降低温室气体排放。该策略也有助于废物资源的利用和管理。受控低强度材料（CLSMs）是一种由不符合规格要求的工业副产品组成的回填材料。使用冶金废渣代替水泥本身作为辅助胶凝材料来制备CLSMs，是建筑业可持续发展的一个关键特征。因此，本文综述了利用冶金废渣（包括高炉矿渣、钢渣、赤泥和铜渣）作为SCMs部分替代水泥，以及利用碱激活冶金废渣作为胶凝材料完全替代水泥用于生产CLSMs的最新研究进展。介绍了火山灰性冶金矿渣的一般背景信息、力学特性和性能，并分析了冶金矿渣对CLSMs性能和力学性能的关系及作用机理。本文的分析和观察为SCMs的开发提供了一种新资源，阐述了将冶金废渣用作制备CLSMs的胶凝材料的依据，并提供了一种减少与冶金废物处理相关的环境问题的策略。
