State of the art: long-term performance of cement-based solidfied soil under the acid/alkaline/salinity attacking environment

Soil and groundwater are often affected by industry, agriculture, sea water, and municipal sewage, and have different kinds of corrosive ions. When cement-based materials are used to reclaim the heavy-metal-contaminated sites by the solidification/stabilization method, these corrosive ions will attack the solidified soils, leading to the performance deterioration and the re-release of the heavy-metal cations. This re-release will result in the challenge of the secondary pollution under the long-term services. Presently, the research on soil solidification mainly focuses on the development of new composite solidified agent and the short-term performance, and more attention to the long-term performance under acid/alkaline/salinity attacking environment should be paid. In the study, the engineering performance and leaching characteristics are first summarized, and the interaction mechanism among the soil, binder, heavy metal and attacking environment was systematically elaborated, so as to provide a reference for the improvement of the solidified remediation quality and durability of heavy metal contaminated soil.