石灰石煅烧煤矸石水泥处理镍污染土的固化特性  

Solidification Characteristics of Limestone Calcined Coal Gangue Cement for Nickel-contaminated Soil

作　　者：侯世伟[1] 张飞[1] 张皓[1] 刘军 丁兆洋[3] HOU Shiwei;ZHANG Fei;ZHANG Hao;LIU Jun;DING Zhaoyang(School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China;School of Environmental Engineering,Shenyang Jianzhu University,Shenyang 110168,China;Engineering Material Testing Center of Shenyang Jianzhu University,Shenyang 110168,China)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]沈阳建筑大学环境工程学院,辽宁沈阳110168 [3]沈阳建筑大学工程材料检测中心,辽宁沈阳110168

出　　处：《防灾减灾工程学报》2022年第5期986-992,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家重点研发计划(2018YFD1100404);辽宁省教育厅项目(LJKZ0564)资助。

摘　　要：随着碳排放量的增加,使用可持续且有效的低碳低成本胶结材料在污染土壤的稳定/固化方面受到了广泛关注。本研究通过无侧限抗压强度、毒性浸出、X射线衍射、扫描电镜等试验来确定新型低碳低成本石灰石煅烧煤矸石水泥对重金属镍污染土的固化特性。结果表明:强度随着养护龄期的增长而增加,随着镍离子浓度的增加而降低;镍离子浸出浓度随着养护龄期的增长而降低,随着镍离子浓度的增加而增大;pH较大(碱性环境),有利于促进水泥对重金属污染土壤的固化效率;X射线衍射和扫描电镜试验表明,生成水化硅酸盐、钙矾石等水化产物及不溶性金属氢氧化物是稳定镍的主要方式。石灰石煅烧煤矸石水泥可以为重金属镍污染土提供环保且可持续的固化修复,处理后的固化土可作为建筑材料循环使用。With the increase of carbon emissions,the use of sustainable and effective low-carbon and low-cost cementitious materials has attracted extensive attention in the stabilization/solidification of contaminated soil. In this study,unconfined compressive strength,toxicity characteristic leaching procedure,X-ray diffraction,scanning electron microscopy and other tests were carried out to determine the solidification characteristics of a new type of coal gangue cement calcined with low carbon and low cost limestone for heavy metal nickel contaminated soil. The results show that the strength increases with the curing age and decreases with the increase of nickel ion concentration. The leaching concentration of nickel ion decreases with the increase of curing age and increases with the increase of nickel ion concentration. The higher pH value(alkaline environment)is beneficial to promote the solidification efficiency of cement to heavy metal contaminated soil;X-ray diffraction and scanning electron microscopy show that the formation of hydration products,such as silicate hydrate and ettringite and insoluble metal hydroxide,were the main ways to stabilize nickel. Limestone calcined coal gangue cement can provide environmentally friendly and sustainable solidification and repair for heavy metal nickelcontaminated soil,and the treated solidified soil can be recycled as building materials.

关 键 词：低碳材料 重金属 固化 无侧限抗压强度 毒性浸出 

分 类 号：TU443[建筑科学—岩土工程]