Rheology, strength and durability properties of mortars containing copper tailings as a cement replacement material

This paper investigates the suitability of copper tailings as a cement replacement material in mortars. The impact of copper tailings at 0%, 5%, 10% and 15% cement replacement level by mass on the rheology, mechanical and durability properties of mortars was evaluated. Results revealed higher yield stress and flow loss in mixtures incorporating copper tailings. High mortar compressive strength, flexural strength and abrasion resistance were determined at 5% cement replacement level. Furthermore, despite increased rate of water absorption, higher resistance to acid attack and chloride penetrations were also observed in samples containing copper tailings. These improved properties were more pronounced in samples containing pre-wetted tailings at 5% cement substitution level. The use of copper tailings in mortars could bring about significant environmental conservation and sustainability gains.