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Open AccessArticle

Enhancement of Mechanical Properties and Porosity of Concrete Using Steel Slag Coarse Aggregate

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Department of Civil Engineering, University of Asia Pacific, Dhaka 1205, Bangladesh
2
Department of Civil Engineering, International University of Business Agriculture and Technology, Dhaka 1230, Bangladesh
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Department of Civil Engineering, Stellenbosch University, Private Bag X1, Matieland 7602, Stellenbosch, South Africa
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Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Assam 781039, India
*
Author to whom correspondence should be addressed.
Materials 2020, 13(12), 2865; https://doi.org/10.3390/ma13122865
Received: 31 May 2020 / Revised: 20 June 2020 / Accepted: 22 June 2020 / Published: 26 June 2020
(This article belongs to the Special Issue Recycled Materials for Concrete and Other Composites)
This paper investigates the possibility of utilizing steel slags produced in the steelmaking industry as an alternative to burnt clay brick aggregate (BA) in concrete. Within this context, physical, mechanical (i.e., compressive and splitting tensile strength), length change, and durability (porosity) tests were conducted on concrete made with nine different percentage replacements (0%, 10%, 20%, 30%, 40%, 50%, 60%, 80%, and 100% by volume of BA) of BA by induction of furnace steel slag aggregate (SSA). In addition, the chemical composition of aggregate through X-ray fluorescence (XRF) analysis and microstructural analysis through scanning electron microscopy (SEM) of aggregates and concrete were performed. The experimental results show that the physical and mechanical properties of concrete made with SSA were significantly higher than that of concrete made with BA. The compressive and tensile strength increased by 73% when SSA fully replaced BA. The expansion of concrete made with SSA was a bit higher than the concrete made with BA. Furthermore, a significant lower porosity was observed for concrete made with SSA than BA, which decreased by 40% for 100% SSA concrete than 100% BA concrete. The relation between compressive and tensile strength with the porosity of concrete mixes are in agreement with the relationships presented in the literature. This study demonstrates that SSA can be used as a full replacement of BA, which is economical, conserves the natural aggregate, and is sustainable building material since burning brick produces a lot of CO2. View Full-Text
Keywords: steel slag aggregate; concrete; compressive and tensile strength; length change; porosity steel slag aggregate; concrete; compressive and tensile strength; length change; porosity
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Miah, M.J.; Patoary, M.M.H.; Paul, S.C.; Babafemi, A.J.; Panda, B. Enhancement of Mechanical Properties and Porosity of Concrete Using Steel Slag Coarse Aggregate. Materials 2020, 13, 2865.

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