論文・報告
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超低水結合材比条件で単位水量を通常よりも低減し、細骨材に人工軽量骨材を用い、結合材の約6割が副産物で構成された低環境負荷型高強度コンクリートを対象として、その収縮特性および凍結融解抵抗性を検討した。水結合材比を18、20、25%の3水準とし、単位水量110～140kg/m³の範囲で十分に吸水させた人工軽量細骨材を使用し、AE剤を使用しない条件で室内試験を実施した。その結果、自己収縮ひずみと乾燥収縮ひずみはどちらも全水準で少ない結果となったが、凍結融解試験の結果には調合条件による違いが確認された。実験結果から、凍結融解抵抗性が求められる場合に推奨される調合条件の範囲を提案した。 キーワード: 高強度コンクリート、人工軽量細骨材、低環境負荷、単位水量、収縮ひずみ、凍結融解 |
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Shrinkage and freeze-thaw resistance properties were investigated on high-strength concrete with ultralow water binder ratio of which unit water content was reduced than conventional concrete. In particular, the studied concrete was with low environmental impact in which about 60% of the binder was composed of by-products and containing artificial lightweight aggregate. The water-binder condition is an ultra-low water binder ratio that has a reduced unit water amount than conventional concrete. Laboratory tests using saturated artificial lightweight fine aggregate were conducted under the condition that the water-binder ratio was set to three levels: 18, 20 and 25%. Unit water content was set around 110 to 140 kg / m³, and no AE agent was used. As a result, although both autogenous and drying shrinkage were small at all levels, some differences were confirmed from the results of the freeze-thaw test. From the experimental results, we proposed the range of recommended mix proportion when freeze-thaw resistance is required. Key Words: High-strength concrete, Artificial lightweight fine aggregate, Low environmental impact, Unit water content, Shrinkage, Freeze-thaw |
論文