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Comparison of hydration properties of cement carbon steel slag and cement stainless steel slag mixed cementitious materials

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Document pages: 9 pages

Abstract: The effects of carbon steel slag (CS) and stainless steel slag (SS) on cement hydration were studied in this paper. Two types of slag were used to replace cement, with replacement rates of 15 (CS15 and SS15) and 30 (cs30 and SS30) of the weight of binder, respectively. The results show that the hydration rate of opc-cs binder is similar to that of opc-ss binder on the third day, but higher than that of opc-ss binder in the later stage. When the substitution rate of steel slag does not exceed 15 , the negative effect of steel slag on the strength of cement mortar can be ignored. X-ray diffraction (XRD) and thermogravimetric analysis (TG) show that adding SS can reduce the content of calcium hydroxide (CH) in cement matrix more than adding CS. BSE (backscattered electron) EDX (energy dispersion)X-ray spectroscopy) analyses estimate the average Si Ca ratio of CS30 and SS30 at 90 days to be 0.41(Ca Si = 2.44) and 0.45(Ca Si = 2.22), respectively, compared to 0.43 (Ca Si = 2.33) for pure cement.

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