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The cemented soil technique is defined as a method of improving soil properties by mixing cements with in-situ soils. Cemented soils can be used in structure retaining and seepage control of small-scale irrigation in hydraulic engineering by using a form of cushion material on large channels, roads and compound pile foundation of dam slope and other projects. They can be applied in unpolluted and polluted conditions, such as industrial land and seawater. MgCl2 is one of the commonest causes resulting in pollution of cemented soils. The corrosive environment may cause the change in mechanical and engineering properties of cemented soils. Much research attention has been focused on the influence of corrosive environment on cemented soil. Iorliam1 and Moses2 recommended using CKD as a modifier for stabilizing BCS with cement or other additives. Kolias studied the effectiveness of high calcium fly ash and cement in stabilizing fine-grained clayey soils in the laboratory and the results obviously presented the technical benefits of stabilizing clayey soils using fly ash and cement.3 Ning et al. investigated the behaviour of cemented soil under various environmental conditions and concluded that the environmental corrosion had little effect on the fracture process in contrast to the evident influence on mechanical strength.4 Xing et al. showed that Mg2+, Cl− and SO4 not only caused a change in the microstructure of salt-rich soil-cements, but also reduced the strength of the soil-cement composite.5–7 To evaluate this adverse effect on the behaviour of soil-cement composite, Yang analysed the factors contributing to cement-based solidification/stabilization of the polluted soil and the optimum parameters.8 Bai and Dong tested mechanical properties and electrical resistivity of cement-soil polluted by H2SO4. Yang et al. studied the strength of soil stabilized by cement in the corrosive environment of seawater and measured the strength distribution by using micro cone-penetration tests.11 Liu and Qu studied the durability of cemented soil under brine corrosion.12 However, the studies of the influence of MgCl2 on properties of cemented soil are limited. To understand MgCl2 corrosion, a series of laboratory tests were conducted in this study on the cemented-soil blocks cured in MgCl2 solutions of different concentrations.

Corrosion Mechanism of Cemented Soil in MgCl2 Solution