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This paper discusses the factors affecting the strength development of dredged soil stabilized with steel slag. Fifteen different soils and forty-five slags were tested, focusing on silica eluted from dredged soil as well as calcium eluted from slag. The higher unconfined compressive strengths were obtained according to the elution mass of silica from the dredged soil when the sufficient calcium was eluted from the steel slag. Similarly, the higher unconfined compressive strengths were obtained according to the elution mass of calcium from steel slag when the sufficient silica was provided from the soil. These results indicated that required elution masses of both silica and calcium exist to achieve the target strength. To obtain the strength of 100 kN/m 2 , calcium elution of 5.0 mg/g and silica elution of 60 mg/g are required.

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