Use of copper slag flotation tailings in concrete
DOI:
https://doi.org/10.21703/0718-2813.2025.38.3629Keywords:
Copper slag flotation tailings, Concrete, Cement replacement, Compressive strength, Waste recycling, Sustainable constructionAbstract
This preliminary study explores the potential of copper slag flotation tailings (CSFW), a byproduct of the copper mining industry in Chile, as a partial replacement for Portland cement in concrete. A CSFW sample from a Chilean smelter was characterized, and concrete mixtures with CSFW substitutions ranging from 0% to 20% (in 5% increments) were tested to evaluate compressive strength at 7, 28, and 60 days. X-ray diffraction (XRD) revealed that CSFW is primarily composed of hedenbergite, magnetite, fayalite, and albite. Although compressive strength decreased with higher levels of CSFW substitution, the mixture with 5% replacement achieved approximately 80% of the control concrete’s strength at 60 days. Plasticity increased significantly with CSFW content, with slump tripling in the 20% mixture compared to the control, which indicates an increase in workability but also an excess of water in the mix. These results suggest that CSFW is a viable alternative for low-level cement replacements, promoting the valorization of mining waste and environmental sustainability in the construction sector in Chile.
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