超高強度コンクリートを用いたRC柱の膨張材と収縮低減剤による初期応力・初期欠陥低減に関する研究

概要

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According to former research, surface crack, crack around rebar, and internal crack were observed in a reinforced concrete column with ultra high-strength concrete (UHSC) placed in winter. Following this result, effect of temperature due to hydration heat on shrinkage strain, as well as effects of dosage of expansive additive (EX) and shrinkage reducing agent (SRA) on shrinkage behavior of concrete was investigated experimentally, secondly restrained stress and resultant cracking behavior in reinforced concrete columns with ultra UHSC containing EX and SRA, as well as UHSC without EX and SRA placed in winter were investigated. As a result, 1) lower temperature of fresh concrete and higher temperature due to heat hydration enlarge the autogenous shrinkage of concrete, 2) regardless of temperature of fresh concrete and concrete history, the combined dosage of expansive additive and shrinkage reducing agent was effective in reducing shrinkage and restrained stress of concrete, 3) internal crack can not be observed in the reinforced concrete column with EX and SRA.
社団法人日本建築学会の論文
2009-01-30