石灰石煅烧煤矸石水泥固化镍污染土特性研究  

Characteristics of Nickel-Contaminated Soil Solidified by Limestone Calcined Coal Gangue Cement

作　　者：侯世伟[1] 张飞[1] 陈昕[1] 张皓[1] 丁兆洋[2] HOU Shiwei;ZHANG Fei;CHEN Xin;ZHANG Hao;DING Zhaoyang(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168;Engineering Material Testing Center,Shenyang Jianzhu University,Shenyang,China,110168)

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

出　　处：《沈阳建筑大学学报（自然科学版）》2022年第4期618-626,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家重点研发计划项目(2018YFD1100404);辽宁省教育厅项目(LJKZ0564,LNQN201906)。

摘　　要：目的研究新型低碳石灰石煅烧煤矸石水泥材料在重金属污染土壤中的固化性能,探究其在固化污染土壤方面的潜在用途。方法通过无侧限抗压强度、电阻率、扫描电镜试验分析石灰石煅烧煤矸石水泥对重金属镍污染土的固化特性。结果无侧限抗压强度随养护龄期的增长而增加,随镍离子污染质量比的增加而降低;电阻率随养护龄期的增长而降低,随镍离子质量比的增加而增大;不溶性絮状物与针状结晶物是水泥水化的主要产物。结论石灰石煅烧煤矸石水泥的掺加提高了重金属镍污染土的强度性能,改善了水泥土的微观结构。The solidification performance of a new type of low-carbon limestone calcined coal gangue cement in heavy metal contaminated soil is studied to explore its potential use in solidifying contaminated soil.The solidification characteristics of limestone calcined coal gangue cement on heavy metal nickel contaminated soil are determined by the unconfined compressive strength,electrical resistivity,and scanning electron microscope tests.The unconfined compressive strength increases with the increase of the curing age,and decreases with the increase of the mass ratio of nickel ion pollution in the soil;the resistivity decreases with the increase of the curing age,and increases with the increase of the nickel ion mass ratio;insoluble flocs and needle-like crystals are the main products of cement hydration.The addition of limestone calcined coal gangue cement improves the strength performance of heavy metal nickel contaminated soil and improves the microstructure of cement soil.

关 键 词：低碳 重金属 固化 无侧限抗压强度 电阻率 扫描电镜 

分 类 号：TU398.1[建筑科学—结构工程]