石灰基矿渣-钢渣复合胶凝材料性能及水化机理
Properties and Hydration Mechanism of Lime-Based Slag-Steel Slag Composite Cementitious Materials
王营 1顾晓薇 1王青 1胥孝川1
作者信息
- 1. 东北大学 资源与土木工程学院,辽宁 沈阳 110819;辽宁省固废产业技术创新研究院,辽宁 沈阳 110819;东北大学 智慧水利与资源环境科技创新中心,辽宁 沈阳 110819
- 折叠
摘要
为分析石灰基矿渣-钢渣复合胶凝材料的性能及水化机理,对不同质量分数的钢渣、石灰复合胶凝材料的力学性能和工作性能进行讨论,并通过XRD等检测手段探究复合胶凝材料的水化产物、化学结构以及微观形貌.研究结果表明:石灰基矿渣-钢渣复合胶凝材料中钢渣最佳质量分数为30%,养护28 d抗压强度达到32.3 MPa;复合胶凝材料水化产物主要为C-(A)-S-H凝胶、水化碳铝酸钙、Ca(OH)2、方解石,其中C-(A)-S-H凝胶相互交错搭接为复合胶凝材料提供主要抗压强度;石灰基矿渣-钢渣复合胶凝材料中钢渣质量分数在20%～30%时不会对胶凝材料中C-(A)-S-H凝胶生成量产生较大影响且可以促进矿渣水化;适量钢渣具有充填效应使复合胶凝材料中微裂缝减少,基体更加致密,提高复合胶凝材料的力学性能.
Abstract
To analyze the properties and hydration mechanism of lime-based slag-steel slag composite cementitious materials,discussions are conducted on the mechanical properties and working performance of the composite cementitious materials with different steel slag and lime mass fraction.Furthermore,detection methods such as XRD are employed to explore the hydration mechanism of the composite cementitious materials.The research results indicate that the optimal steel slag content in lime-based slag-steel slag composite cementitious materials is 30%.The compressive strength is 32.3 MPa after 28 d of maintenance.The primary hydration products of the composite cementitious materials are C-(A)-S-H gel,hydrocalumite,Ca(OH)2,and calcite,among which the interlocking C-(A)-S-H gel provides the primary compressive strength for the composite cementitious materials.When the steel slag content in the composite cementitious materials ranges from 20%to 30%,it does not significantly affect the formation of C-(A)-S-H gel in the cementitious materials and can promote the hydration of slag.An appropriate amount of steel slag exhibits a filling effect,reducing microcracks in the composite cementitious materials,making the matrix more compact,and enhancing the mechanical properties of the composite cementitious materials.
关键词
石灰/矿渣-钢渣复合胶凝材料/力学性能/工作性能/水化机理Key words
lime/slag-steel slag composite cementitious material/mechanical property/working performance/hydration mechanism引用本文复制引用
出版年
2024
NETL
NSTL
万方数据