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

作　　者：魏明俐[1,2] 张智 李媛媛 贾世波 Wei Mingli;Zhang Zhi;Li Yuanyuan;Jia Shibo(Hubei Key Laboratory of Contaminated Clay Science and Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Science,Wuhan,Hubei 430071;Jiangsu Institute of Ecological Soil should Ltd,Yixing,Jiangsu 214200;College of Civil Engineering,Liaoning Technical University,Fuxin,Liaoning 123000;School of Civil Engineering,Qingdao University of Technology,Qingdao,Shandong 266033)

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]江苏中宜生态土研究院有限公司,江苏宜兴214200 [3]辽宁工程技术大学土木工程学院,辽宁阜新123000 [4]青岛理工大学土木工程学院,山东青岛266033

出　　处：《非金属矿》2019年第5期76-78,共3页Non-Metallic Mines

基　　金：国家自然科学基金(51774163);国家自然科学基金青年基金(41702349)

摘　　要：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.

关 键 词：碱激发固化剂 酸雨 干湿循环 侵蚀机理 铁尾矿砂 

分 类 号：X753[环境科学与工程—环境工程]