Study on the Stabilization/Solidification of Lead-Contaminated Soil Using Alkali-Activated Cementing Materials with Rich-Silicon Materials

Abstract:

In this study, the stabilization/solidification of lead in soils using alkali-activated cementing materials with rich-silicon materials was investigated. The artificial Pb-polluted soil with 500mg/kg lead was treated using fly ash-, silica fume-and rice husk ash-based cementitious materials, respectively, at the dosages 25%. The effectiveness of treatment was assessed with unconfined compressive strength (UCS) and the toxicity characteristic leaching procedure (TCLP) after curing for 14 and 28 days. Overall, the UCS results showed that the UCS values are above the USA EPA’s recommended value of 0.35 MPa. The TCLP results indicated that the Pb concentrations extracted from soils amended with 25% cementitious materials after 14 and 28 days are near 0.25mg/L, far below 5mg/L (the TCLP regulatory limit). And the XRD results showed the immobilization of lead were due to the formation of PbSiO₃, the sorption of C-S-H.

• Periodical: Advanced Materials Research (Volume 1142)
• Pages: 291-295
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1142.291
• Online since: January 2017
• Authors: Min Zhou, Shu Yan Wu, Yi Lv, Wei Xin Wang, Hao Bo Hou
• Keywords: Lead, Rich-Silicon Materials, Soil Remediation, Solidification/Stabilization

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