| Summary: | The soil and vegetation on the ground surface are affected when the zinc content in the soil is excessively high. It is of great importance to choose suitable additives for the solidification/stabilization treatment of zinc-contaminated silt soil. Research focus on the stress–strain, shear strength, and durability of dry–wet cycle for solidified soil contaminated with different contents of zinc is scarce. In this study, the strength, microscopic, and stability of solidified silt are examined and analyzed, and the solidification agent with the best effect is identified. The silt near the mouth of the Pearl River in China is collected, the different contents of zinc are added, and then 15% cement and 15% cement + 5% slag or 15% cement + 10% slag are added to the mixture for curing. The effects of solidification with different additives at the different zinc contents are determined through test, for example, unconfined compressive strength, leaching, scanning electron microscopy, triaxial undrained solidification, X-ray diffraction, and dry–wet cycling experiments. The results show that the admixture that contained 15% cement + 10% slag has a better effect on solidification/stabilization of zinc-contaminated silt. Thus, this study provides a reference for the treatment of zinc-contaminated soft soil.
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