| 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Cd2+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. |
| 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 |
| DOI：10.3969/j.issn.1007-9629.2022.01.009 |
| 分类号:TU528.01 |
| 基金项目: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 |
|
| Effects of OPC-GBFS-NS System Based Soil Stabilizer on Soil Stabilization |
|
ZHANG Guofang1,2, WANG Bo1,2, ZHANG Haixu1,2, ZHANG Shenyi3, KANG Ming3
|
|
1.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education， Tongji University， Shanghai 201804， China;2.School of Materials Science and Engineering， Tongji University， Shanghai 201804， China;3.Shanghai Baosteel New Building Materials Technology Co.， Ltd.， Shanghai 200942， China
|
| Abstract: |
| 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 Cd2+ in the soil， accordingly to significantly reduce the dissolution of Cd2+. 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. |
| Key words: soil stabilizer soil stabilization unconfined compressive strength consolidation of heavy metal ions mechanism |
