STUDY TO EXPAND THE APPLIABLE RANGE OF ON-SITE REFORMING METHOD IMPROVNG DREDGED SOIL BY STEELMAKING SLAG

We have devised the on-site reforming method to improve a seabed clay ground by mixing with a steelmaking slag at the original position. In the research, we have considered to apply the method to plastic state clay ground. A series of 1/5 scale model experiments was carried out to verify the effectiveness of the improved mixing machine and the method of adding water to clay before supplying the slag. As the result, plastic state clay was found to be mixed with the slag more homogeneously in the machine. It was also found the mixability of the improved soil was enhanced by pouring water simultaneously with the fine granulation process of clay. While it should be noted that the lack of mixing time of clay and water increases the variation in the strength of the modified soil, the on-site reforming method could be applied sufficiently to improve a seabed clay ground in a plastic state.