Properties of Steel Slag and Stainless Steel Slag as Cement Replacement Materials: A Comparative Study
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2018年第6期
论文作者：SALY Fathy GUO Liping MA Rui GU Chunping SUN Wei
文章页码：1444 - 1451
摘 要：To enhance the understanding about the utilization of steel slags as a cementitious material, we comparatively studied the chemical, mineralogical and morphological properties of two types of steel slag; basicoxygen-furnace carbon slag（BOF C） and electric-arc-furnace stainless steel slag（EAF S）. Moreover, we studied the standard consistency, setting time and the effect of the slag replacement ratios on the fluidity and compressive strength of blended cement mortar. The experimental results showed that BOF C had higher alkalinity, higher pH value and more hydraulic phases than EAF S. Both types of slag showed water reduction effect due to its high fineness. Neat BOF C paste showed flash set and acceleration in the initial setting time of blended cement especially at high slag proportions. However, EAF S prolonged the setting time of blended cement even at low slag proportions. The pH values for blended cement contained 50% BOF C or EAF S were lower than those of pure cement paste. Despite of slag type, compressive strength gradually decreased with increasing slags content. The strength of BOF C mortar was higher than that of EAF S mortar with the same replacement ratio for the same age. Slag activity index demonstrated that BOF C and EAF S conformed to the Chinese National Standard（GB/T 20491-2006） requirements for steel slag as grade one and grade two, respectively.
SALY Fathy1，GUO Liping1,2,3，MA Rui1，GU Chunping4，SUN Wei1,2,3
1. School of Material Science and Engineering, Southeast University3. Jiangsu Key Laboratory of Construction Materials4. College of Civil Engineering and Architecture, Zhejiang University of Technology
摘 要：To enhance the understanding about the utilization of steel slags as a cementitious material, we comparatively studied the chemical, mineralogical and morphological properties of two types of steel slag; basicoxygen-furnace carbon slag（BOF C） and electric-arc-furnace stainless steel slag（EAF S）. Moreover, we studied the standard consistency, setting time and the effect of the slag replacement ratios on the fluidity and compressive strength of blended cement mortar. The experimental results showed that BOF C had higher alkalinity, higher pH value and more hydraulic phases than EAF S. Both types of slag showed water reduction effect due to its high fineness. Neat BOF C paste showed flash set and acceleration in the initial setting time of blended cement especially at high slag proportions. However, EAF S prolonged the setting time of blended cement even at low slag proportions. The pH values for blended cement contained 50% BOF C or EAF S were lower than those of pure cement paste. Despite of slag type, compressive strength gradually decreased with increasing slags content. The strength of BOF C mortar was higher than that of EAF S mortar with the same replacement ratio for the same age. Slag activity index demonstrated that BOF C and EAF S conformed to the Chinese National Standard（GB/T 20491-2006） requirements for steel slag as grade one and grade two, respectively.
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