SELF-DEGRADATION TYPE CEMENT COMPOSITION AND ITS CONCRETE PRODUCT

PROBLEM TO BE SOLVED: To provide a self-degradation type cement composition and its concrete product, which can self-degrade after service period and whose self-degradation time can be controlled. SOLUTION: The self-degradation type cement composition contains a retardation-type expansive material h...

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Hauptverfasser:	HAYASHI SHISHO, TOCHIGI TAKASHI
Format:	Patent
Sprache:	eng
Schlagworte:	AGRICULTURE ANIMAL HUSBANDRY ARTIFICIAL STONE CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPSOR SEAWEED FISHING FORESTRY HORTICULTURE HUMAN NECESSITIES HUNTING LIME, MAGNESIA METALLURGY REFRACTORIES SLAG TRAPPING TREATMENT OF NATURAL STONE WATERING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a self-degradation type cement composition and its concrete product, which can self-degrade after service period and whose self-degradation time can be controlled. SOLUTION: The self-degradation type cement composition contains a retardation-type expansive material having slow expansion action in a cement composition. Preferably, the self-degradation type cement composition contains, as the retardation-type expansive material, dead-burned magnesia fired at a high temperature of ≥1,200°C so that the degradation time can be controlled. A concrete product obtained by using the self-degradation type cement composition is also provided. COPYRIGHT: (C)2006,JPO&NCIPI