Effect of Ca/Al Ratio on Stabilization/Solidification of Lead-Contaminated Soil by Ettringite
作者： Lian Xiang , Huamei Zhu , Ruoyun Zhou
DOI: 10.1155/2018/3612962
关键词:
摘要: Ettringite is commonly used for the stabilization/solidification heavy metal-contaminated soils, and its treatment effect will be influenced by Ca/Al mole ratio. Lead-contaminated soil samples were solidified using ettringite with different ratios. The pH value, unconfined compressive strength of samples, leaching concentration investigated to understand influence ratio on properties ettringite-solidified contaminated soils. microstructural characteristics soils also explored. results show that lead decreases dramatically increasing content lime curing time. Lead drops from 49.89 mg/L 0.19 mg/L when increases 4 : 3 10 : 3 at 28 days 36.57 mg/L near 0 mg/L 90 days. In addition, first then increase Besides, values leachate rise lime. 9.68 11.34, there little difference between However, 5.56 8.59 days, 90-day 5.65 9.44. SEM, XRD, EDS tests indicate affects shape ettringite, effectiveness soil, pore soil. When equals 8 : 3, has a substantial increase, lower than 5 mg/L.
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