MANUFACTURE OF CONCRETE PRODUCT

PROBLEM TO BE SOLVED: To provide a method for manufacturing a concrete product wherein a high compressive strength can be achieved within a short curing period. SOLUTION: For manufacturing concrete products, under conditions that a high-early-strength portland cement and an inorganic accelerator are...

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Bibliographische Detailangaben
Hauptverfasser:	UCHIDA IKUO, MATSUDA SATORU, MIYATA YUKIO, OTAKE JUNICHIRO, HAYASHI SHISHO
Format:	Patent
Sprache:	eng
Schlagworte:	ARTIFICIAL STONE CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE LIME, MAGNESIA METALLURGY PERFORMING OPERATIONS PREPARING CLAY PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL,e.g. PLASTER REFRACTORIES SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG, OR MIXTURESCONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER SLAG TRANSPORTING TREATMENT OF NATURAL STONE WORKING CEMENT, CLAY, OR STONE
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for manufacturing a concrete product wherein a high compressive strength can be achieved within a short curing period. SOLUTION: For manufacturing concrete products, under conditions that a high-early-strength portland cement and an inorganic accelerator are used, the water-cement ratio of concrete is 30-45 wt.%, steam curing, during the time while forms are placed and removed, is performed at a temperature of 70 deg.C or lower and within a cumulative temperature (maturity factor) of 210-290 deg.C.hr. As the accelerator, 2-10 wt.% of at least one of materials such as calcined alum, hydraulic gypsum, lime, aluminate compound to the weight of cement is used.