It is examined to be recycled by mixing the steel slag with dredged clay as base material of the tideland and the structure in shallow water. To confirm the possibility of application as a basic material of such a mixture material and the possibility of construction, the Field performance tests was executed. Dredged clay is mixed with steel slag and it is made to harden. Underwater mounds are made by using the one that the mixtured soil that had become hard was disturbed. To do adequate construction, the indoor examination was executed. The best mixture proportion of dredged clay and steel slag was decided. The effect of controlling the pH and the increase of SS of the mixture material in the sea was verified.
