METHOD FOR MANUFACTURING CEMENTITIOUS HARDENED ARTICLE

PROBLEM TO BE SOLVED: To provide a method for manufacturing a cementitious hardened article which is produced by secondary curing, which has ultrahigh strength and where the occurrence of color shading on its surface can be prevented. SOLUTION: The method for manufacturing the cementitious hardened...

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Hauptverfasser:	ICHIKAWA KATSUTOSHI, KATAGIRI MAKOTO, SAKASHITA MASASHI, SATO MASAMI
Format:	Patent
Sprache:	eng
Schlagworte:	ARTIFICIAL STONE CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE LIME, MAGNESIA METALLURGY REFRACTORIES SLAG TREATMENT OF NATURAL STONE
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for manufacturing a cementitious hardened article which is produced by secondary curing, which has ultrahigh strength and where the occurrence of color shading on its surface can be prevented. SOLUTION: The method for manufacturing the cementitious hardened body comprises (A) a forming step of forming form an unhardened formed body by kneading a blended material containing at least cement, fine powders and water and having a water/cement ratio of 24 mass% or less and by pouring the kneaded blended material into a mold, (B) a primary curing step of primarily curing the unhardened formed body and obtain a hardened formed body and (C) a secondary curing step of preparing the cementitious hardened article by secondarily curing the hardened formed body after demolding. A part or the whole of the secondary curing step in the method is performed in carbon dioxide gas atmosphere having a carbon dioxide concentration of 0.1-10%. COPYRIGHT: (C)2009,JPO&INPIT