摘要
采用碱激发高炉矿渣对铅污染土进行固化稳定处理,并研究其固化稳定机理。结果表明:随着固化剂掺量提高,GGBS-MgO固化铅污染土酸缓能力的固化污染土酸缓冲系数β随之提高;铅能够抑制GGBS-MgO进行水化反应,致使GGBS-MgO固化铅污染土比表面积远低于同掺量的固化未污染土;GGBS-MgO固化铅污染土q_u均低于相同掺量下固化未污染土,且无侧限抗压强度与其比表面积间存在明显的线性关系;SEM和XRD结果显示,GGBS-MgO固化铅污染土和固化未污染土的试样,主要水化产物都为C-S-H与Ht;累积进汞量和孔径直径结果显示,GGBS-MgO固化未污染土累积进汞量高于固化铅污染土。
The Pb-contaminated soils stabilized by alkali-activated GGBS and the mechanism are researched.The results show that the acid capacity value ascended with the binder dosage increases for the contaminated-soils stabilized by GGBS-MgO.The specific surface area of soils stabilized by GGBS-MgO is higher than that of uncontaminated soil as the Pb inhibites the hydration reaction of GGBS-MgO.The strength of stabilized soils with GGBS-MgO is higher than that of uncontaminated ones,which has a liner relationship with the specific surface area.The SEM and XRD results indicate that the main hydration products of stabilized contaminated and uncontaminated soil are C-S-H and Ht and can be analyzed using the XRD methods.The accumulative mercury and pore diameter results show that the accumulative mercury mass of the stabilized uncontaminated soils is higher than that of the contaminated soils stabilized by GGBS-MgO.
作者
伍浩良
薄煜琳
杜延军
魏明俐
薛强
WU Hao-liang;BO Yu-ling;DU Yan-jun;WEI Ming-li;XUE Qiang(Jiangsu Key Laboratory of Urban Underground Engineering&Environmental Safety,Southeast University,Nanjing 210096,China;Institute of Geotechnical Engineering,Southeast University,Nanjing 210096,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2019年第A01期137-140,共4页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金重点项目(41330641)
国家自然科学基金项目(41472258)
“863”计划项目(2013AA06A206)
江苏省自然科学杰出青年基金项目(BK2012022)
江苏省研究生创新项目(KYLX16_0242)
东南大学优秀博士学位论文培育基金项目(YBJJ1735)
关键词
固化/稳定技术
碱激发高炉矿渣
酸缓冲能力
无侧限抗压强度
微观特性
solidification/stabilization
alkali-activated GGBS
acid neutralization capacity
strength property
micromechanism
