Abstract
This paper examines gel of grout by using powder X-ray diffraction. As a result, it was clarified that the silicate gel of all grouts used in this experiment is amorphous. Further, colloidal silica sol grout, that increases in strength with age, was examined for the gel material changes over a period of 7 years. As a result, silicate gel of colloidal silica sol grout remained amorphous material regardless of age. Also, the relationships between chemical structure of gel and freezing and freezing-thawing behaviear of grouted sand strength was examined. Freezing-thawing grouted sand with organic grouts had almost the same strength as before freezing.
