Feasibility Evaluation of Replacing River Sand with Copper Tailings

This study aims to realize the resource regeneration application of copper tailing (as fine aggregates for partial replacement natural aggregates), which avoid environmental pollution due many landfills tailings. The compressive strength and durability (dry shrinkage sulfate attack) tests were carried out evaluate effect tailings on performance mortar. results show that mortar with has higher than one sand. More 14% improvement in can be achieved by adding no more 40% level. dry was increased increase micro pores using Compared sand, reduced 20% attack resistance is improved tailings, when rate 20%. In fact, micro-aggregate filler effectively refines pore structure forms stable, uniform interface pores, vital significance resist external forces ion erosion. However, as a porous material, have water release characteristics cement characteristic not conducive effect, decreases filling later hydration, leading porosity importantly, solidify heavy metals prevents loss metal such Cu, Zn, Sr, Zr, As, Ga problems.