Environmental protection by using waste copper slag as a coarse aggregate in self-compacting concrete

Abstract

© 2020 The copper production process causes waste and by-products called waste copper slag (WCS). A considerable amount of WCS is produced globally. This research aims to utilise WCS as an alternative to natural coarse aggregate in self-compacting concrete (SCC). To achieve this goal, WCS was utilised in different percentages (0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100%) as a natural coarse aggregate replacement in SCC production. Following this, the fresh, mechanical, and durability characteristics of SCCs incorporating WCS as a partial replacement of coarse aggregates were investigated in-depth. Incorporating 100% WCS as coarse aggregates in SCCs showed 27%, 29%, and 26% growth in compressive, split, and flexural strengths in 28 days, respectively. The reduction of free drying shrinkage of the mixture containing 100% WCS compared to the control mixture was approximately 36%, and the water absorption of all the specimens was less than 6%. Further, the increase in weight for the mixture containing 100% WCS as coarse aggregates was less than 15% compared to the control mixture. A cost analysis of the SCCs showed that incorporating WCS for all coarse aggregates reduced production costs by 19%. Investigating the economic index of concrete containing WCS as a coarse aggregate showed that utilising the WCS in green SCC was feasible.

Document Type

Journal Article

Date of Publication

10-1-2020

ISSN

03014797

Volume

271

PubMed ID

32778296

Publication Title

Journal of Environmental Management

Publisher

Elsevier

School

School of Engineering

RAS ID

32014

Comments

Sharifi, Y., Afshoon, I., Asad-Abadi, S., & Aslani, F. (2020). Environmental protection by using waste copper slag as a coarse aggregate in self-compacting concrete. Journal of Environmental Management, 271, article 111013. https://doi.org/10.1016/j.jenvman.2020.111013

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Link to publisher version (DOI)

10.1016/j.jenvman.2020.111013