EVALATION OF EFFCT OF SPECIMEN SIZE AND SLAG DISTRIBUTION ON UNCONFINED COMPRESSION STRENGTH OF SLAG-CLAY MIXTURES

Abstract

 Mixture of dredged clay generated during navigation channel maintenance and steel slag from steel mills (hereinafter referred to as "modified soil") is being utilized. In this study, as a basic investigation, the effects of specimen size and different maximum particle sizes of steel slag on the unconfined compression strength of the modified soil were investigated for two different addition rates, which are relatively low.

 As a result, the following properties were obtained. A linear approximation of the relationship between the ratio of the amount of slag to clay mass, which affects the strength of the modified soil, and the unconfined compression strength showed that the coefficient of determination, R², was about 0.53 for the total amount of slag added, but when the maximum grain sizes were matched and the ratio of the amount of slag below a certain maximum grain size to the clay mass was taken, the R² improved to about 0.9. Thus, it was found that the unconfined compression strength of the modified soil can be estimated by aligning the maximum grain size.