Engineering and Technology Journal

Evaluation of the Performance of Steel Slag and Waste Glass as a Cement Replacement

Document Type : Research Paper

Authors

1 Material Engineering Dept., University of Technology-Iraq, Alsina’a street, 10066 Baghdad, Iraq.

2 Civil Engineering Dept., University of Technology-Iraq, Alsina’a street, 10066 Baghdad, Iraq.

Abstract

The industrial development and growth in population activity caused an annual increase in solid wastes over the past decades. The emissions of CO2 from the cement industry are the main source of air pollution. Recycling wastes as cementitious materials conserve the ecosystem in different aspects, e.g., reduction of CO2 footprint. Consequently, the pozzolanic activity of two solid wastes abundantly available in Iraq, steel slag (SS) and waste glass (WG), were evaluated. This study aimed to replace them with ordinary Portland cement. This will achieve a sustainable, eco-efficient, and environmentally friendly construction industry. The Chemical analysis of the wastes by XRF and XRD suggests a possible cementitious capability owing to the amorphous nature of WG and the presence of C3S and C2S in SS. Accordingly, due to international standards, cubic mortars were produced by replacing cement with SS at 50% and WG at 50% and 20%. The effects of such replacements on the compressive strength of mortars were evaluated by comparison with that of the control mortars. WG increases workability and results in a higher strength index (72.8%) than that of SS (48.7%) at similar replacement levels (50%). Subsequently, SS and WG replaced coarse aggregates (CA) and cement, respectively, in concrete. The results revealed positive effects of SS on compressive strength in contrast to WG influence. The compressive strength of concrete cured for 91d increased by about 20% compared to the control sample upon incorporation of 50% SS without any WG.

Graphical Abstract

Highlights

  • This work assessed the pozzolanic activity of locally available steel slag and waste glass in mortars.
  • Effects of steel slag and waste glass replacing cement on workability, density, and strength index are studied.
  • Unlike waste glass, steel slag decreased mortar strength and workability.
  • Steel slag improved compressive strength and mitigated the negative impact of waste glass in concrete.

Keywords

Main Subjects

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Engineering and Technology Journal
Volume 41, Issue 12
Production & Metallurgy Engineering
18 articles
December 2023
Page 1567-1577
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