Study on the Early Strength Law of Alkaline Steel Slag Replacing Cement by Chemical Excitation
Alkaline steel slag as the research object,the change law of alkaline steel slag cementitious activity was investigated by chemical excitation methods.The effects of different kinds and dosage of chemical activators on the activity of steel slag were studied.Hydration products of cement replaced by steel slag were analyzed by XRD and SEM.The results show that mechanical grinding can effectively improve the content of coarse and fine particles in the steel slag particle size,and optimize the particle gradation.The optimal grinding time is 20 min Ininters Chemical excitation can further improve the cementitious activity of steel slag on the basis of mechanical stimulation,and the best effect is obtained when the self-made early-strengthening agent dosing is 2.0%,the dosage of mirabilite is 3.0%,the dosage of sodium hydroxide is 1.0%,and the dosage of steel slag is 25%.The main hydration products of cement replaced by steel slag are calcite(CaCO3),calcium hydroxide(Ca(OH)2),dicalcium silicate(Ca2 SiO4),and C-S-H gel.The microstructure presents a fiber network structure,which lays the foundation for the improvement of mechanical properties.
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