OPC-GBFS-NS体系土体硬化剂固化土壤的作用效果研究  

Effects of OPC-GBFS-NS System Based Soil Stabilizer on Soil Stabilization

作　　者：张国防[1,2] 王博[1,2] 张海旭 张沈裔 康明 ZHANG Guofang;WANG Bo;ZHANG Haixu;ZHANG Shenyi;KANG Ming(Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education,Tongji University,Shanghai 201804,China;School of Materials Science and Engineering,Tongji University,Shanghai 201804,China;Shanghai Baosteel New Building Materials Technology Co.,Ltd.,Shanghai 200942,China)

机构地区：[1]同济大学先进土木工程材料教育部重点实验室,上海201804 [2]同济大学材料科学与工程学院,上海201804 [3]上海宝钢新型建材科技有限公司,上海200942

出　　处：《建筑材料学报》2022年第1期61-67,共7页Journal of Building Materials

基　　金：国家重点研发计划项目(2016YFC0700905,2018YFD1101003);上海市住房与城乡建设委员会科研项目(2020-001-009);固废资源化利用与节能建材国家重点实验室开放基金。

摘　　要：研究了以普通硅酸盐水泥(OPC)-矿渣微粉(GBFS)-硫酸钠(NS)体系制备的土体硬化剂对普通地表土壤和海滩淤泥这2种土壤的固化效果及其固化机理.研究表明,OPC-GBFS-NS土体硬化剂对2种土壤均具有良好的固化效果,使得固化土具有较高的无侧限抗压强度,对土壤中重金属离子Cd^(2+)也有较好的固结作用,能显著降低Cd2+的溶出.该土体硬化剂对土壤的固化效果主要源于其在土壤中能快速水化生成大量细长的水化产物钙矾石,并对土壤颗粒起到较紧密的胶结作用.The stabilization effect and mechanism of the soil stabilizer based on the ternary system of ordinary Portland cement,granulated blast furnace slag and sodium sulfate(OPC-GBFS-NS)on two different soils were studied.The results show that the soil stabilizer has good stabilization effects on both common surface soil and seaside silt to bring high unconfined compressive strength of the stabilized soil,and assumes good consolidation effects on the heavy metal ion Cd^(2+) in the soil,accordingly to significantly reduce the dissolution of Cd^(2+).The stabilization effect of the soil stabilizer is mainly due to its rapid hydration in the soil to generate a large number of slender ettringite crystals,which tightly connect with soil particles.

关 键 词：土体硬化剂 土壤固化 无侧限抗压强度 重金属离子固结 机理 

分 类 号：TU528.01[建筑科学—建筑技术科学]