钢渣尾泥-矿渣-脱硫石膏三元体系水化硬化特性

为促进大宗化利用钢渣尾泥,以河北迁安的钢渣尾泥为研究对象,借助X射线衍射(XRD)、场发射扫描电镜(FE-SEM)、傅里叶红外光谱(FT-IR)、热重-差热分析(TG-DTA)测试方法,研究了钢渣尾泥在矿渣-脱硫石膏体系中的水化硬化特性。研究表明,经机械粉磨后的钢渣尾泥仍表现出较好的水硬胶凝特性,与普通钢渣-矿渣-脱硫石膏体系相比具有早期强度高的优势,其水化产物主要为钙矾石(AFt)和水化硅酸钙(C-S-H)凝胶。在水化反应过程中:钢渣尾泥为体系提供碱性环境,促使矿渣中玻璃体解离;矿渣水化不断消耗羟基,进一步促进了钢渣尾泥的水化;脱硫石膏为体系提供大量的Ca²⁺和SO^2-₄,这些离子与体系中的凝胶反应生成AFt。三者相互渗透协同反应推动了水化反应持续进行。

Characteristics of Hydration and Hardening of Steel Slag Mud-Blast Furnace Slag-Desulphurization Gypsum System

In order to promote large quantity and high value-added utilization of steel slag mud,the hydration and hardening characteristics of steel slag mud from Qian’an of Hebei under blast furnace slag and desulphurization gypsum were investigated with XRD,FE-SEM,FT-IR and TG-DTA.The results indicate that the steel slag mud still shows good hydrated cementitious property after mechanical grinding.Compared with ordinary steel slag-blast furnace slagdesulphurization,the compressive strength of cementitious materials has the advantage of high early strength.Its hydration products are mainly AFt and C-S-H gel.During the hydration reaction process,the steel slag mud provides an alkaline environment for the system and promotes the dissociation of the vitreous in the slag.The slag hydration continuously consumes hydroxyl groups to further promote the hydration of the steel slag mud.The desulfurized gypsum provides a large amount of Ca²⁺ and SO₄^2-,which react with gel in the system to produce AFt.The three materials interact with each other to synergistic reaction and promote the continuous hydration reaction.