Comparison of Mechanical and Durability Properties of Concretes Containing Copper Heap Leach Residue
Abstract
This paper presents comparative properties of concretes containing washed and un-washed copper heap leach residue (CHLR) as partial replacement of natural aggregates at 25 to 75%. The mechanical and durability properties of the concrete are evaluated with unwashed saturated surface dried (SSD) CHLR and these properties are compared with the 60 min rigorously washed-SSD CHLR concretes. The mechanical properties of control concrete containing natural aggregates showed 46.7 MPa of compressive strength, 3.61 MPa of indirect tensile strength, and 4.80 MPa of flexural strength at 28 days, while the durability properties of the specimen indicated 450 μɛ of drying shrinkage, 5.8% of volume of permeable voids, and 3x10-3 mm/sec0.5 of primary sorptivity at 90 days. The relative values of mechanical properties for unwashed 50% CHLR concretes were decreased by 21%, 21%, and 25%, while the relative values of durability properties were increased by 102%, 157%, and 183%, respectively. Nonetheless, the mechanical properties of washed 50% CHLR CA concrete specimen were decreased by -1.3%, 2.5%, and 27% compared to the control, however, the relative values of the durability properties of the specimen were increased by 47%, 41%, and 80%. Therefore, a 60 min rigorously washed CHLR graded CA reduced silt-clay, weak particles, highly soluble reactive ions and a 50% incorporation of these aggregates provided better mechanical and durability performance compared to the unwashed CHLR at the same replacement.
Keywords
copper heap leach residue, mechanical properties, durability properties, soluble salts, sustainability.
DOI
10.5703/1288284318110
Recommended Citation
Khair, S.; Shaikh, F.U.A.; and Sarker, P.K., "Comparison of Mechanical and Durability Properties of Concretes Containing Copper Heap Leach Residue" (2025). International Conference on Durability of Concrete Structures. 3.
https://docs.lib.purdue.edu/icdcs/2025/sce/3
Comparison of Mechanical and Durability Properties of Concretes Containing Copper Heap Leach Residue
This paper presents comparative properties of concretes containing washed and un-washed copper heap leach residue (CHLR) as partial replacement of natural aggregates at 25 to 75%. The mechanical and durability properties of the concrete are evaluated with unwashed saturated surface dried (SSD) CHLR and these properties are compared with the 60 min rigorously washed-SSD CHLR concretes. The mechanical properties of control concrete containing natural aggregates showed 46.7 MPa of compressive strength, 3.61 MPa of indirect tensile strength, and 4.80 MPa of flexural strength at 28 days, while the durability properties of the specimen indicated 450 μɛ of drying shrinkage, 5.8% of volume of permeable voids, and 3x10-3 mm/sec0.5 of primary sorptivity at 90 days. The relative values of mechanical properties for unwashed 50% CHLR concretes were decreased by 21%, 21%, and 25%, while the relative values of durability properties were increased by 102%, 157%, and 183%, respectively. Nonetheless, the mechanical properties of washed 50% CHLR CA concrete specimen were decreased by -1.3%, 2.5%, and 27% compared to the control, however, the relative values of the durability properties of the specimen were increased by 47%, 41%, and 80%. Therefore, a 60 min rigorously washed CHLR graded CA reduced silt-clay, weak particles, highly soluble reactive ions and a 50% incorporation of these aggregates provided better mechanical and durability performance compared to the unwashed CHLR at the same replacement.
