酸雨对碱激发材料固化细铁尾矿砂干湿性影响

Effect on Drying and Wetting Cycles Resistance of Fine Iron Tailings Solidified by Alkali-Activated Materials under Acid Rain Corrosion

通过测试碱激发固化剂改良铁尾矿砂在两种循环结束后的无侧限抗压强度、在各级循环下的质量、浸泡液的pH值和累计电导率,对比了模拟液分别为酸雨和自来水的干湿循环对固化体的侵蚀机理。结果表明:两种干湿循环对结构的破坏性侵蚀开端都发生在第6个循环,相较于浸泡液为自来水的干湿循环,除B外酸雨模拟液干湿循环下碱激发固化剂改良体的强度更低;碱激发材料固化体质量损失较小;各级循环下碱激发材料固化体的浸泡液pH值变化更明显,且数值偏低;碱激发材料胶凝体在各级循环中浸泡液的累计电导率数值更高。

By testing the unconfined compressive strength after end of two cycles,mass,pH and cumulative conductivity of sample soak solution at all levels of circulation,the corrosion mechanism of fine iron tailings solidified by alkali-activated materials under two drying and wetting cycles with simulated solution acid rain or tap water were compared The results showed that,destructive erosion beginning of structure by both drying and wetting cycles occurs at the sixth cycle,compared with the drying and wetting cycles with tap water soaking solution,besides B,the strength of the sample modified by alkali-activated curing agent was lower,the quality loss of each specimen is smaller,pH of soaking solution of alkali-excited material solidified body at every cycle has a lower value and more obvious changes,the cumulative conductivity of the soaking solution of the alkaliexcited material gel in each cycle is higher under the circulation with acid rain simulated solution.