早强型钢渣基胶凝材料的制备及其水化机理研究OA

Steel slag is the main waste produced in the process of steelmaking,which has the characteristics of single use,large production and environmental pollution.This article prepares early strength steel slag based cementing materials by mixing steel slag micro powder and 42.5 ordinary Portland cement with reinforcing agents Ⅰ and Ⅱ,respectively.By measuring the chemical composition and mineral composition of the raw materials,the mechanical properties of the cementing materials were tested,and their thermal stability and microstructure were analyzed to reveal the hydration mechanism of the cementing materials.The results showed that the early compressive strength of the gelled material is greatly improved,and the later compressive strength is good.This is because the reinforcer can promote the consumption of Ca(OH)2 and increase the hydration reaction rate,and the OH-hydrolyzed by Ca(OH)2 can promote the dissolution of silicate from the vitreous in the steel slag powder and form C-S-H gel with Ca2+.The sulfate contained in the reinforcer can form ettringite AFt with the cementing material and fill the gel pores to enhance the compactness of the material.The optimal ratio of early-strength steel slag based cementing material is 125 g steel slag powder and 10 g reinforcement agent Ⅱ.The research results provide the new idea for the preparation of early-strength steel slag based cementing materials,and can also provide reference for the comprehensive utilization research of steel slag.