Study on the Effect of Nano-SiO2 Synergistic Acid Pretreatment on the Alkali Efflorescence Behavior of Alkali-Activated Steel Slag-Slag
In order to reduce the impact of alkali efflorescence behavior on alkali-activated steel slag-slag materials,this paper adopts a pretreatment method combining sulfuric acid pretreatment of steel slag with different dosages of nano-silica dioxide. The study investigates the influence of nano-SiO2 synergistic acid pretreatment on the alkali efflorescence behavior of alkali-activated steel slag-slag materials in alkaline environments with different moduli,while measuring the mortar strength of steel slag-based composite materials. Scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) are used to analyze the mechanism of the composite system. The results indicate that sulfuric acid pretreatment of steel slag and nano-SiO2 have a synergistic effect on improving the alkali efflorescence behavior of alkali-activated steel slag-slag materials. When the modulus of water glass is 1,with sulfuric acid pretreatment of steel slag and the addition of 2％ nano-SiO2 by mass fraction,the microstructure is smooth,the pore structure is optimized,the compressive strength is the highest,and the alkali efflorescence behavior is improved to the greatest extent.
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