METHOD FOR MANUFACTURING RAPID HARDENING CONCRETE

PROBLEM TO BE SOLVED: To provide rapid hardening concrete that assures a predetermined usable life and has a good initial strength development property even at ordinary temperature.SOLUTION: The method for manufacturing rapid hardening concrete including cement, an accelerating agent including calci...

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Bibliographische Detailangaben
Hauptverfasser:	KWAK DOYEON, YAMANAKA TOSHIYUKI
Format:	Patent
Sprache:	eng ; jpn
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 SLAG TRANSPORTING TREATMENT OF NATURAL STONE WORKING CEMENT, CLAY, OR STONE
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide rapid hardening concrete that assures a predetermined usable life and has a good initial strength development property even at ordinary temperature.SOLUTION: The method for manufacturing rapid hardening concrete including cement, an accelerating agent including calcium nitrite, an expansive material, a polycarboxylic acid-based water-reducing agent, an aggregate and water comprises: (A) a step of kneading the above-mentioned constitutional materials exclusive of the accelerating agent including calcium nitrite to produce base concrete, (B) a step of adding the accelerating agent including calcium nitrite to the base concrete and kneading the same; and (C) a step of further adding the polycarboxylic acid-based water-reducing agent after the step (B) and kneading the same.SELECTED DRAWING: None 【課題】所定の可使時間が確保され、常温においても、良好な初期強度発現性を有する速硬コンクリートを提供する。【解決手段】セメント、亜硝酸カルシウムを含む促進剤、膨張材、ポリカルボン酸系減水剤、骨材および水を含む速硬コンクリートの製造方法であって、（Ａ）前記構成材料のうち、亜硝酸カルシウムを含む促進剤を除く材料が混練され、ベースコンクリートが製造される工程と、（Ｂ）前記ベースコンクリートに亜硝酸カルシウムを含む促進剤が添加され混練される工程と、（Ｃ）工程（Ｂ）の後、さらにポリカルボン酸系減水剤が添加され混練される工程とを具備することを特徴とする速硬コンクリートの製造方法。【選択図】なし