Utilization of Copper Slag in Cement and Concrete Applications

Copper slag, a plentiful by-product of the copper smelting process, has emerged as a versatile resource in cement and concrete technology. Traditionally considered a waste requiring disposal, it is now recognised for its potential to replace either cement or aggregates in concrete mixtures. As a supplementary cementitious material, finely ground copper slag contributes to strength gain and durability through pozzolanic reactions with calcium hydroxide, reducing reliance on clinker and lowering embodied carbon. When used as a fine aggregate substitute, its angular particles can enhance packing density and mechanical interlock, improving compressive strength and abrasion resistance. Variations in processing—such as mechanical activation, ultrafine milling or thermal treatment—further refine its reactivity and optimise its performance in both conventional Portland cement systems and advanced binders, including geopolymer formulations. Practical applications range from high-performance and self-compacting concretes to fibre-reinforced and alkali-activated systems. Life-cycle assessments indicate that substitution rates of up to 40–50 % deliver environmental benefits by reducing natural sand extraction, embodied energy and carbon emissions, without compromising structural performance. Challenges remain in ensuring consistent quality of the slag feedstock, managing potential heavy metal leaching and adapting mix designs to mitigate effects on setting times and workability. Nonetheless, global developments in circular economy frameworks and pressure on aggregate resources continue to drive innovation in the incorporation of copper slag as a sustainable component of modern concrete construction.

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Utilization of Copper Slag in Cement and Concrete Applications publication trend

The graph below shows the total number of articles in utilization of copper slag in cement and concrete applications across all publications each year (not limited to Nature Index journals).

Technical terms

Pozzolanic activity: the chemical reaction of siliceous or aluminous materials with calcium hydroxide, forming cementitious compounds that contribute to strength development.

Supplementary cementitious material (SCM): a material used in conjunction with Portland cement to enhance performance, durability and sustainability of concrete.

Geopolymer concrete: an inorganic polymer binder system in which aluminosilicate precursors are activated by alkaline solutions to produce a cement-free matrix.

Life cycle assessment (LCA): a methodology for evaluating the environmental impacts of a product throughout its life span, from raw material extraction to end-of-life.

Workability: the ease with which fresh concrete can be mixed, transported, placed and finished without segregation.

Compressive strength: the capacity of a material to withstand axial loads, measured as the maximum stress it can sustain before failure.

References

1. Waste copper slag in special concrete: Current research and future applications. Materials & Design (2025).
2. Mechanical Activation of Granulated Copper Slag and Its Influence on Hydration Heat and Compressive Strength of Blended Cement. Materials (2019).
3. Mechanical Properties and Durability of Concrete with Water Cooled Copper Slag Aggregate. Waste and Biomass Valorization (2017).
4. Hydration and strength development in blended cement with ultrafine granulated copper slag. PLOS ONE (2019).
5. Life‐Cycle Assessment of High‐Strength Concrete Mixtures with Copper Slag as Sand Replacement. Advances in Civil Engineering (2019).
6. Development of High-Strength Geopolymer Concrete Incorporating High-Volume Copper Slag and Micro Silica. Sustainability (2022).
7. Destructive and Non-Destructive Testing of the Performance of Copper Slag Fiber-Reinforced Concrete. Materials (2022).
8. Life Cycle Assessment of Concrete Using Copper Slag as a Partial Cement Substitute in Reinforced Concrete Buildings. Buildings (2023).