| 摘要 |
PROBLEM TO BE SOLVED: To provide an expansive additive for cement in which a sufficient shrinkage compensation effect and strength developability can be obtained even when the amount of moisture supply is small. SOLUTION: The expansive additive composition for cement includes (A) an amorphous aluminosilicate derived from a clay mineral, (B) a modified starch, (C) anhydrous gypsum, (D) an alkali metal sulfate, and (E) an organic acid calcium salt represented by the formula: (RCOO)<SB>2</SB>Ca, wherein R represents a hydrogen atom or a 1C-3C alkyl group which may be substituted with a hydroxy group. COPYRIGHT: (C)2010,JPO&INPIT |
