为研究环保材料对铅污染土固化/稳定化效果,以干旱半干旱地区重金属铅污染及固体废弃物资源化利用为研究背景,使用固体废弃物高炉矿渣协同水泥制备新型固化材料地质聚合物,探讨其固化重金属铅的宏观力学表现及微观机理变化.基于水泥基固化重金属铅污染土,探究不同比例下地聚物-水泥的强度表现及毒性浸出表现,对性能突出组进行微观试验表征.试验结果表明:80％的矿渣地聚物协同水泥相比水泥基及其他分组拥有更好的固化/稳定化重金属铅的表现,污染程度③下抗压强度及毒性浸出结果显著优于其他分组;X射线衍射(X-ray diffraction,XRD)、扫描电子显微镜(scanning electron microscope,SEM)、核磁共振(nuclear magnetic resonance,NMR)等试验显示80％矿渣地聚物内部结构完整且连结密实,水泥固化体内部变化剧烈,水化反应受到重金属抑制,整体结构松散,存在密度低且不连续.
Characteristics of Solidified/Stabilized Lead Contaminated Sandy by Slag Composite
In order to study the solidification/stabilization effect of environmental protection material geopolymer on lead contaminated soil,based on the research background of heavy metal lead pollution and solid waste resource utilization in arid and semi-arid areas,a new solidified material geopolymer was prepared by using blast furnace slag and cement,and the macroscopic mechanical performance and microscopic mechanism of solidified heavy metal lead were discussed.Based on the cement-based solidification of heavy metal lead-contaminated soil,the strength performance and toxicity leaching performance of geopolymer-cement under different proportions were explored,and the microscopic test characterization of the outstanding performance group was carried out.The test results show that compared with cement-based and other groups,80％slag geopolymer combined with cement has better performance of solidification/stabilization of heavy metal lead,and the compressive strength and toxicity leaching results under pollution degree ③ are significantly better than other groups.phase analysis of X-ray diffraction(XRD),scanning electron microscope(SEM),nuclear magnetic resonance(NMR)and other tests show that the internal structure of 80％slag geopolymer is complete and dense,the internal changes of cement solidified body are severe,the hydration reaction is inhibited by heavy metals,the overall structure is loose,and the density is low and discontinuous.
geopolymerscontaminated soilsolidification and stabilizationclean energy
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