Analysis of Compressive Strength and Activity of Steel Slag Based Solid Waste Admixture
In order to promote the resource utilization of solid waste and solve the problems of low activity index of steel slag,steel slag,slag and ceramic powder(SGC)were used as admixtures to replace part of the cement to prepare composite cementitious materials.Through mechanical property testing,scanning electron microscopy,DTA-TG and XRD analysis,the effects of SGC admixture systems on the strength and hydration products of mortar under different ratios and dosages were explored,and the hydration mechanism of composite cementitious materials was analyzed to find the best activation scheme.The results showed that the single doped steel slag exhibited low activity.The performance of steel slaGslag double doping group was better than that of steel slaGceramic powder.In the three-doping system,the steel slag and slag in the early stage of hydration produced Ca(OH)2 and a small amount of C-S-H and C-A-H gel,which provided early strength,and the secondary hydration reaction of active SiO2 and Al2O3 with Ca(OH)2 produced a large number of hydration products such as C-S-H and C-A-H gel.Moreover,the unreacted particles of the three-doping system were filled with each other,so there was a coupling synergy in the SGC ternary admixture system,which jointly promoted the increase of the strength of the system and had the potential to prepare admixture.When the mix ratio of steel slag,slag and ceramic powder was 2∶1∶1,and 3%SGC was used to instead of cement,the compressive strength of the mortar was the highest,which was 45.6 MPa in 28 d,and its activity index reached 93.08%.
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