摘要
为探究黄金尾矿掺量对混凝土力学性能及在冻融循环和硫酸盐侵蚀联合作用下的抗劣化性,利用电液伺服压力机对细黄金尾矿机制砂掺量为 0%、5%、10%、15%、20%、25%、30%的试件静态力学性能进行了测试分析,并研究了素混凝土及细黄金尾矿机制砂混凝土在冻融循环及硫酸盐侵蚀联合作用下的抗压强度劣化规律.试验结果表明:① 黄金尾矿机制砂的掺入能够极大改善混凝土材料的延展性,对提升建筑物的安全性具有重要意义;② 相较于未掺尾矿机制砂试件,掺量为 5%、10%、15%、20%、25%、30%时试件抗压强度增幅为 8.04%、10.87%、21.04%、17.73%、3.31%、-9.22%,抗拉强度增幅为 15.04%、20.70%、31.25%、36.72%、29.10%、14.06%,适量黄金尾矿的掺入能够有效提高混凝土材料的力学性能,且最佳掺为 20%;③ 冻融循环及硫酸盐侵蚀联合作用对 2 种混凝土试件均存在劣化作用,且随着冻融循环次数增加及硫酸盐浓度增大试件劣化程度不断增加;④ 黄金尾矿机制砂混凝土试件在浓度为 0%的硫酸盐溶液下冻融循环 50、100、150、200、250 次时,试件抗压强度降幅仅为素混凝土的 43%、44%、47%、45%、47%,尾矿在试件内部与骨料间良好的黏结作用提高了试件抗外荷载能力以及抗盐侵蚀、抗冻融能力.
Abstract
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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