干湿循环下铁尾矿砂再生混凝土耐久性研究

试验主要研究了不同掺量铁尾矿砂对再生骨料混凝土在硫酸盐干湿循环作用下质量损失率、抗压耐腐蚀系数、超声声速等性能变化的影响。研究结果表明:基于再生粗骨料替代率为30%的情况下,当掺量30%铁尾矿砂等量替代细骨料时,在硫酸盐干湿循环50次时可以使再生骨料混凝土质量损失大大减少,抗压耐腐蚀系数达到最大。当掺量10%铁尾矿砂等量替代细骨料时,其超声声速值高于其他掺量铁尾矿再生混凝土的超声声速值。

Durability of recycled concrete with iron tailings sand under dry-wet cycling

The experiment mainly studied the effects of different iron ore tailings on the mass loss rate,compressive corrosion resistance coefficient and ultrasonic sound velocity of recycled aggregate concrete under the dry and wet cycle of sulfate.The results show that based on the replacement ratio of recycled coarse aggregate is 30%,when the amount of 30%iron tailings is substituted for the fine aggregate,the quality of recycled aggregate concrete can be made in the dry and wet cycle of sulfate 50 times.The loss is greatly reduced and the compressive and corrosion resistance coefficient is maximized.When the amount of 10%iron tailings is substituted for the fine aggregate,the ultrasonic sound velocity is higher than the ultrasonic sound velocity of other iron ore tailings recycled concrete.