CONCRETE COMPOSITION, METHOD FOR MANUFACTURING CONCRETE STRUCTURE, AND CONCRETE STRUCTURE: Fid-Bau Portal

CONCRETE COMPOSITION, METHOD FOR MANUFACTURING CONCRETE STRUCTURE, AND CONCRETE STRUCTURE

KOJIMA MASAO / SASA YOSHINOBU / HONMA DAISUKE

To provide a concrete composition in which cracking is prevented from being caused by inflation and constriction due to heat deformation during hardening of a high-strength concrete hardened body, by constriction due to internal drying, and the like, to provide a method for manufacturing a concrete structure, and to provide the concrete structure.SOLUTION: A concrete composition comprises a binder, water, a fine aggregate, a coarse aggregate, and an additive, wherein: the binder comprises a Portland cement and a silica fume; a content of the silica fume to the whole binder is 5 mass% or more and 25 mass% or less; the additive contains at least one saccharide having a molecular weight of less than 500; and a ratio of (the water)/(the binder) is 8 mass% to 28 mass%. A method for manufacturing a concrete structure, and the concrete structure are also provided.SELECTED DRAWING: None

【課題】高強度コンクリート硬化体の硬化時の熱変形による膨張及び収縮、内部乾燥による収縮などに起因するひび割れが抑制されたコンクリート組成物、コンクリート構造体の製造方法及びコンクリート構造体を提供する。【解決手段】結合材、水、細骨材、粗骨材及び混和剤を含み、結合材は、ポルトランドセメント及びシリカフュームを含み、全結合材に対するシリカフュームの含有量が５質量％以上２５質量％以下であり、混和剤は、少なくとも１種の分子量５００未満の糖類を含み、水／結合材比が８質量％〜２８質量％であるコンクリート組成物、コンクリート構造体の製造方法及びコンクリート構造体。【選択図】なし

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