Effect of Gold Tailings Content on the Deterioration Resistance of Concrete under the Combined Effect of Freeze-thaw Cycle and Sulfate Attack
In order to investigate the mechanical properties of concrete and the resistance to deterioration under the com-bined effect of freeze-thaw cycle and sulfate attack,the static mechanical properties of fine gold tailing mechanism sand with 0%,5%,10%,15%,20%,25%,30%specimens were measured by electro-hydraulic servo press,and the deterioration of com-pressive strength of plain concrete and fine gold tailing mechanism sand concrete under the combined effect of freeze-thaw cycle and sulfate attack were studied.The results show that:① The incorporation of gold tailing mechanism sand can greatly improve the ductility of concrete materials,which is important to enhance the safety of buildings.② Compared with the specimens with-out tailing,the increase of compressive strength was 8.04%,10.87%,21.04%,17.73%,3.31%,-9.22%and tensile strength was 15.04%,20.70%,31.25%,36.72%,29.10%,14.06%for 5%,10%,15%,20%,25%and 30%of the specimens,the appropriate amount of gold tailing can effectively improve the mechanical properties of concrete materials,and the best blend of 20%.③ The combined effect of freeze-thaw cycles and sulfate erosion on both concrete specimens have deterioration effect,and with the increase in the number of freeze-thaw cycles and sulfate concentration increases the degree of deterioration of the specimens.④ The compressive strength of the concrete specimens with gold tailing in 0%sulfate solution was only 43%、44%、47%、45%、47%of plain concrete when the specimens were subjected to freeze-thaw cycles of 50,100,150,200 and 250 times,and the good adhesion between the tailing and the aggregates inside the specimens improved the resistance of the speci-mens to external loading as well as the resistance to salt erosion and resistance to freeze-thaw resistance.
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