碱激发高炉矿渣固化铅污染土酸缓能力、强度及微观特性研究

采用碱激发高炉矿渣对铅污染土进行固化稳定处理,并研究其固化稳定机理。结果表明:随着固化剂掺量提高,GGBS-MgO固化铅污染土酸缓能力的固化污染土酸缓冲系数β随之提高;铅能够抑制GGBS-MgO进行水化反应,致使GGBS-MgO固化铅污染土比表面积远低于同掺量的固化未污染土;GGBS-MgO固化铅污染土q_u均低于相同掺量下固化未污染土,且无侧限抗压强度与其比表面积间存在明显的线性关系;SEM和XRD结果显示,GGBS-MgO固化铅污染土和固化未污染土的试样,主要水化产物都为C-S-H与Ht;累积进汞量和孔径直径结果显示,GGBS-MgO固化未污染土累积进汞量高于固化铅污染土。

Acid neutralization capacity,strength properties and micro-mechanism of Pb-contaminated soils stabilized by alkali-activated GGBS

The Pb-contaminated soils stabilized by alkali-activated GGBS and the mechanism are researched. The results show that the acid capacity value ascended with the binder dosage increases for the contaminated-soils stabilized by GGBS-MgO. The specific surface area of soils stabilized by GGBS-MgO is higher than that of uncontaminated soil as the Pb inhibites the hydration reaction of GGBS-MgO. The strength of stabilized soils with GGBS-MgO is higher than that of uncontaminated ones, which has a liner relationship with the specific surface area. The SEM and XRD results indicate that the main hydration products of stabilized contaminated and uncontaminated soil are C-S-H and Ht and can be analyzed using the XRD methods. The accumulative mercury and pore diameter results show that the accumulative mercury mass of the stabilized uncontaminated soils is higher than that of the contaminated soils stabilized by GGBS-MgO.