To provide an underwater back filling material enabling addition of a large volume of soil to be treated and having a high underwater separated resistance and such an underwater back filling method capable of solving the problem that a large volume of soil produced at a site is difficult to effectively use as the underwater back filling material since the water content per unit volume is high in the conventional underwater back filling work even though an underwater back filling work to the back of a revetment or the like is required for the ground subsidence prevention or the hollow filling when a wharf or the revetment is formed.
A hardener liquid containing cement and soil to be treated is mixed with a plasticizer containing attapulgite and a phosphate dispersant to use as a plastic back filling material, and the back filling material is poured into an underwater construction site.
KAWAKAMI AKITA
YOSHIHARA MASAHIRO
TAKAHASHI HIDEO
ESUTEKKU KK
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