In past studies, a powdery silica-based admixture was developed. It was obtained by applying the heat treatment to inorganic waste, such as waste glass and fly ash containing a large amount of silica. The silica-based admixture has also been recognized as an effective solidifying material when it is mixed with blast furnace slag. The colloidal silica and calcium silicate hydrates (CSHs) produced in the process exhibit not only a higher mechanical strength than cement- based solidification material, but also excellent properties such as the expectation of a delayed effect of the solidification time. Therefore, it is considered to be applicable to ground improvement works. In this study, in order to investigate the usefulness of a silica admixture and blast furnace slag solidifying material and the solidifying mechanism by means of a solidification material, an energy dispersive X-ray analysis (EDS analysis), a scanning electron microscope observation (SEM observation) and an X-ray diffraction analysis (XRD analysis) were implemented to examine soils improved by the solidification material.
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