论文?报告
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超低水结合材比条件で単位水量を通常よりも低减し、细骨材に人工軽量骨材を用い、结合材の约6割が副产物で构成された低环境负荷型高强度コンクリートを対象として、その収缩特性および冻结融解抵抗性を検讨した。水结合材比を18、20、25%の3水準とし、単位水量110～140办驳/尘?の范囲で十分に吸水させた人工軽量细骨材を使用し、础贰剤を使用しない条件で室内试験を実施した。その结果、自己収缩ひずみと乾燥収缩ひずみはどちらも全水準で少ない结果となったが、冻结融解试験の结果には调合条件による违いが确认された。実験结果から、冻结融解抵抗性が求められる场合に推奨される调合条件の范囲を提案した。 キーワード: 高强度コンクリート、人工軽量细骨材、低环境负荷、単位水量、収缩ひずみ、冻结融解 |
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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 |
论文