文章编号：1007-2993（2023）04-0455-06湖底淤泥固化土的环境耐久性研究王矿山1庞龙1戴振鑫1章晖1张新军2（1.中国电建集团华东勘测设计研究院有限公司，浙江杭州310000；2.中铁一局集团有限公司，陕西西安710000）【摘要】为了评价淤泥固化土的环境耐久性，采用矿渣体系的碱激发胶凝材料（矿渣粉、偏高岭土、石灰和水玻璃）和普通硅酸盐水泥为固化剂，通过开展无侧限抗压、冻融循环、Na2SO4及NaCl浸泡侵蚀、扫描电镜和EDS-Mapping试验，分析了侵蚀环境下固化淤泥土的典型水化产物、强度演变规律、质量损失率和微观结构特征，结果表明，碱激发固化淤泥内部生成的水化硅铝酸钠凝胶（N-A-S-H）能有效提高强度，但是冻融循环和浸泡侵蚀均会导致固化土强度劣化；水泥固化淤泥受硫酸盐侵蚀后，钙矾石会呈现簇状发展而产生膨胀开裂，导致强度下降；碱激发固化剂的抗氯离子能力优于硫酸根离子，综合环境耐久性优于普通硅酸盐水泥。【关键词】固化淤泥；强度；冻融循环；侵蚀；耐久性【中图分类号】TU411【文献标识码】Adoi:10.3969/j.issn.1007-2993.2023.04.014StudyonEnvironmentalDurabilityofSolidifiedLake-bottomSedimentWangKuangshan1PangLong1DaiZhenxin1ZhangHui1ZhangXinjun2(1.PowerChinaHuadongSurvey,DesignandResearchInstituteCo.,Ltd.,Hangzhou310000,Zhejiang,China；2.ChinaRailwayFirstBureauGroupCo.,Ltd.,Xi’an710000,Shaanxi,China)【Abstract】Inordertoevaluatetheenvironmentaldurabilityofsolidifiedlake-bottomsediment,alkaliactivatedcementingma-terialofslagsystem(slagpowder,metakaolin,limeandsodiumsilicate)andtraditionalcementwereusedascuringagent.Throughun-confinedcompression,freezing-thawingcycle,Na2SO4andNaClerosionleaching,scanningelectronmicroscopyandEDS-Map-pingtests,thetypicalhydrates,strengthevolution,masslossrateandmicrostructurecharacteristicsofsolidifiedsedimentinerosionen-vironmentwereanalyzed.Theresultsshowthatalargeamountofhydratedsodiumsilicatealuminategel（N-A-S-H）wasformedinthealkali-excitedsolidifiedsediment.Thefreezing-thawingcycleanderosionleachingcanleadtothedeteriorationofthestrengthofsolid-ifiedsediment.Thedevelopmentofettringiteledtoexpansionandcrackingwhenthecement-solidifiedsedimentwaserodedbysulfate,whichresultedinthedecrease...
