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

  • Fathy SalyEmail author
  • Liping Guo
  • Rui Ma
  • Chunping Gu
  • Wei Sun
Cementitious Materials
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Abstract

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; basic-oxygen-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.

Key words

steel slag stainless steel slag fluidity setting time compressive strength activity index 

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Copyright information

© Wuhan University of Technology and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Fathy Saly
    • 1
    Email author
  • Liping Guo
    • 1
    • 2
    • 3
  • Rui Ma
    • 1
  • Chunping Gu
    • 4
  • Wei Sun
    • 1
    • 2
    • 3
  1. 1.School of Material Science and EngineeringSoutheast UniversityNanjingChina
  2. 2.Collaborative Innovation Center for Advanced Civil Engineering MaterialsNanjingChina
  3. 3.Jiangsu Key Laboratory of Construction MaterialsNanjingChina
  4. 4.College of Civil Engineering and ArchitectureZhejiang University of TechnologyHangzhouChina

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