GYPSUM-BASED SOLIDIFICATION MATERIAL AND ADDITIVE FOR GYPSUM-BASED SOLIDIFICATION MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a solidification material for reusing construction sludge generated from cast-in-place pile work, shield tunneling work or the like, surplus soil generated in construction such as digging surplus soil, or dredge soil of bottom mud in streams, lakes and sea area by solidifying them in a neutral zone so as to be able to be carried out, as a subsoil material, and to provide an additive for gypsum-based solidification material.;SOLUTION: The solidification material is obtained by adding an aluminum compound and a calcium compound to hemihydrate gypsum. The solidification material obtained by adding the hemihydrate gypsum in the excessive amount than the formed amount of ettringite is obtained by adding the excessive amount of the hemihydrate gypsum than the formed amount of the ettringite to an ettringite precursor material of the compound thereof.;COPYRIGHT: (C)2009,JPO&INPIT