固废基胶凝材料混凝土的生产应用技术与低碳发展  

THE PRODUCTION AND APPLICATION OF SOLID WASTE-BASED CEMENTING MATERIAL CONCRETE AND ITS LOW-CARBON DEVELOPMENT

作　　者：倪文[1] 李倩 琚永健 NI Wen;LI Qian;JU Yongjian(School of Civil and Resource Engineering,University of Science and Technology,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

出　　处：《矿物岩石》2025年第1期31-41,共11页Mineralogy and Petrology

基　　金：国家高技术研究发展计划(863计划)项目:《尾矿制备绿色环保新型建筑材料关键技术与示范》(编号:2012AA062405)。

摘　　要：本文旨在研究钢渣、矿渣和脱硫石膏制备固废基胶凝材料的水化机理,以“复盐效应”和“硅的四配位同构化效应”两个理论作为相互协同的支撑点,以“被动水化动力学”作为技术基础进行进一步深入研究。通过对钢渣理化性质分析,固废基胶凝材料生产工艺调整,解决钢渣工业生产应用所面临的易磨性差、安定性不良、活性差的问题,实现立磨生产的固废基胶凝材料混磨40 min,通用胶砂3 d抗压强度可达22.15 MPa,28 d抗压强度可达44.17 MPa,专用胶砂3d抗压强度可达32.98 MPa,28 d抗压强度可达57.43 MPa。通过钢渣、矿渣、脱硫石膏制备固废基胶凝材料,以尾砂废石为骨料制备的全固废混凝土,3 d抗压强度可达18.67 MPa,28 d抗压强度可达49.0 MPa,并进一步验证了钢渣掺量为60%的固废基胶凝材料制备全固废混凝土的可行性,其3d抗压强度可达24.1 MPa,35 d抗压强度可达45.5 MPa。通过模拟固废基胶凝材料水化环境下,尾矿废石单矿物水化实验,证明尾矿和废石的硅酸盐属性表面有大量的硅氧和铝氧断键,在较低钙硅比和较低水胶比的胶凝材料体系中能够重新键合,形成硅氧四面体的重新链接。本次研究对多固废协同的低碳胶凝材料CO_(2)减排潜力进行了分析展望,本领域预期可以减排CO_(2)总量为11.93亿吨。This paper aims to study the hydration mechanism of solid waste-based cementing materials prepared from steel slag,slag,and desulfurization gypsum.It applies two key theories:the‘compound salt effect'and the‘four-coordinate isomerization effect of silicon'leveraging their synergy,with‘passive hydration kinetics'as the foundation for deeper exploration.Through analyzing the physicochemical property of steel slag and optimizing the production process of solid waste-based cementing materials,this study addresses challenges encountered in industrial production,such as poor abrasiveness,instability,and low reactivity of steel slag.Cementing materials produced through vertical mill grinding for 40 minutes results in the following compressive strengths:3-day strength of 22.15 MPa,28-day strength of 44.17 MPa for general-purpose mortar,and 3-day strength of 32.98 MPa,28-day strength of 57.43 MPa for specialized mortar.Using steel slag,slag,and desulfurization gypsum to prepare solid waste-based cementing materials,and incorporating tailings waste rock as aggregate,results in fully solid waste concrete with the 3-day compressive strength reaching 18.67 MPa and the 28-day compressive strength reaching 49.0 MPa.Furthermore,the feasibility of preparing fully solid waste concrete using solid waste-based cementing materials with 60%steel slag content is confirmed,achieving compressive strength of the concrete of 24.1 MPa at 3 days and 45.5 MPa at 35 days.Simulations of the hydration environment of solid waste-based cementing materials and single-mineral hydration experiments on tailings waste rock,reveal numerous silicon-oxygen and aluminum-oxygen bond breaks on the silicate surfaces of tailings and waste rocks.These bonds can re-form in a cementing material system with a low calcium-silicon ratio and low water-to-binder ratio,leading to reconnections of silicon-oxygen tetrahedra.This paper also evaluates the CO_(2) emission reduction potential of low-carbon cementing materials based on multiple solid wastes,projecting a

关 键 词：固废基胶凝材料 多固废协同作用 钢渣 低碳 矿渣 脱硫石膏 

分 类 号：TU526[建筑科学—建筑技术科学]