Study on the Effect of Hot-stewed Steel Slag on the Properties of Cementitious Materials
Steel slag has certain gelling properties and can be used as concrete admixture,but the treat-ment process has an important effect on it.At present,most of the research is aimed at the non-hot-steaming process steel slag,and there are fewer studies on hot-steaming steel slag.Based on the test method of ce-mentitious sand,the basic mechanical properties of cementitious sand after partially replacing cement by hot-steaming steel slag were comparatively studied under standard curing and pressure-steaming conditions,and microanalysis was carried out by XRD,FESEM and EDS.The results show that,under the standard condi-tion,the hot-steamed steel slag can hydrate to generate C3AH6 and C-S-H,and the activity index reaches 76％at 28 d.Under the pressure steaming condition,Tobermorite and Xonotlite minerals are generated,and the activity index is as high as 92％,and with the increase in the dosage of steel slag(the total amount of steel slag is ≤70％),the flexural strength of the mastic sand has a tendency to increase and the compressive strength has a tendency to decrease,and the compressive strength shows a decreasing trend and is signifi-cantly lower at 70％.
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