To provide a cement-based composition which can sufficiently develop functions of a thickening admixture composed of the combination of two kinds of water-soluble low-molecular compounds.
The cement-based composition is manufactured by using first powder obtained by adsorbing a first water-soluble low-molecular compound selected from cationic surfactants onto the surface of a fumed silica and by drying it and second powder composed of a second water-soluble low-molecular compound selected from anionic aromatic compounds as a thickening admixture, and by blending and kneading the first powder, the second powder, cement, fine aggregate, expanding agent powder and carboxyl group-based polyether-based water reducing agent powder in addition of water. Wherein the water content is in a range of 370-420 kg/m3, the ratio of water to the binding material is in a range of 36.0-45.0%, the sum of the blending amounts of the first powder and the second powder is in a range of 35.0-46.5 kg/m3, and the blending amount of the carboxyl group-based polyether-based water reducing agent is in a range of 1.65-2.5 kg/m3.
KANAMORI SEIJI
NONAKA SUGURU
| JP2007321064A | 2007-12-13 |