钢渣粉对全固废混凝土强度的影响

摘要

Solid waste concrete was prepared using slag,steel slag,desulfurization gypsum cementing materials entirely replace cement clinker as binding material,influence of steel slag specific surface area and steel slag proportion on the compre-hensive strength of the concrete was researched. The results showed that:increasing the specific surface area of steel slag,the compressive strength of concrete increases gradually. Steel slag powder on the early time comprehensive strength of concrete is less than that of slag powder. When the specific surface area of steel slag is 640 m2/kg,proportion of steel slag powder,slag powder,desulfurization gypsum accounted for 25%, 63%, 12% cementing materials respectively, the concrete compressive strength is the highest. Steel slag,slag and desulfurization gypsum interact with each other,promoting the formation and growth of ettringite and C-S-H gel;Ettringite formation is the main source of solid waste concrete early strength,in the late hydration reaction,ettringite and C-S-H gel intertwined and form a compact structure,which can increase the strength of the concrete with industrial solid wastes.%以钢渣粉、矿渣、脱硫石膏为胶凝材料完全替代水泥熟料制备全固废混凝土,考察钢渣粉比表面积和掺量对全固废混凝土抗压强度的影响。结果表明：随着钢渣比表面积的增加,混凝土抗压强度逐渐提高；水化早期钢渣粉对混凝土抗压强度增长贡献小于矿渣粉；在钢渣比表面积为640 m2/kg,钢渣粉、矿渣粉、脱硫石膏粉分别占胶凝材料总质量的25%、63%、12%时,制备的全固废混凝土抗压强度最高。钢渣、矿渣、脱硫石膏相互作用,促进了钙矾石和C-S-H凝胶的形成和生长；钙矾石的生成是混凝土早期强度的主要来源,在水化反应后期,钙矾石和C-S-H凝胶相互交织,形成致密结构有利于混凝土抗压强度提高。