Properties of Steel Slag and Stainless Steel Slag as Cement Replacement Materials:A Comparative Study  

作　　者：SALY Fathy GUO Liping MA Rui GU Chunping SUN Wei 

机构地区：[1]School of Material Science and Engineering,Southeast University,Nanjing 211189,China [2]Collaborative Innovation Center for Ad-vanced Civil Engineering Materials,Nanjing 211189,China [3]Jiangsu Key Laboratory of Construction Materials,Nanjing 211189,China [4]College of Civil Engineering and Architecture,Zhejiang University of Technology,Hangzhou 310014,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2018年第6期1444-1451,共8页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundations of China(Nos.51378113 and 51438003);the Plan of Six Peak Talents in Jiangsu Province(No.JZ-004);Partly Supported by the National Basic Research Program of China(973 Program,No.2015CB655102)

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.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.

关 键 词：steel slag stainless steel slag FLUIDITY setting time compressive strength activity index 

分 类 号：TB[一般工业技术]