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Comparison of properties of traditional and accelerated carbonated solidified/stabilized contaminated soils

Journal of Environmental Sciences 2008年第5期20卷 593-598页

作者： LIU Jiangying XU Dimin XIONG Lan Colin HILLS paula carey Kevin GARDNER State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai 200092 China Department of Civil Engineering University of Birmingham Edgbaston Birmingham B15 2TTUnited Kingdom Centre for Contaminated Land Remediation Department of Earth and Environmental Sciences University of Greenwich Chatham Maritime Kent ME4 4TB United Kingdom Department of Civil Engineering University of New Hampshire Durham NH03824 USA

The investigation of the long-term performance of solidified/stabilized （S/S） contaminated soils was carried out in a trial site in southeast UK. The soils were exposed to the maximum natural weathering for four years and sampled at various depths in a controlled manner. The chemical properties （e.g., degree of carbonation （DOC）, pH, electrical conductivity （EC）） and physical properties （e.g., moisture content （MC）, liquid limit CLL）, plastic limit （PL）, plasticity index （PI）） of the samples untreated and treated with the traditional and accelerated carbonated S/S processes were analyzed. Their variations on the depths of the soils were also studied. The result showed that the broad geotechnical properties of the soils, manifested in their PIs, were related to the concentration of the water soluble ions and in particular the free calcium ions. The samples treated with the accelerated carbonation technology （ACT）, and the untreated samples contained limited number of free calcium ions in solutions and consequently interacted with waters in a similar way. Compared with the traditional cement-based S/S technology, e.g., treatment with ordinary portland cement （OPC） or EnvirOceM, ACT caused the increase of the PI of the treated soil and made it more stable during long-term weathering. The PI values for the four soils ascended according to the order： the EnvirOceM soil, the OPC soil, the ACT soil, and the untreated soil while their pH and EC values descended according to the same order.

关键词： solidified/stabilized accelerated carbonation contaminated soil electrical conductivity liquid limit plastic limit plasticity index

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