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The property of concrete surface which influences the durability of concrete structure will be greatly affected on curing conditions. In this study, the effects of mix proportions, demolding timing and curing methods on concrete surface were investigated. As a result, it was better to delay the demolding timing, when atmospheric curing or membrane curing was carried out. When the atmospheric curing was carried out at the early age, it allowed the concrete strength to reach only 70% of the strength demolding at the age of 7 days in case the water-cement ratio of 53.5%. However, it was better to be earlier the demolding timing, when the wet curing was carried out. Then, the wet curing was carried out at the early age, it could allow the concrete strength to reach 150% of the strength demolding at the age of 7 days after in air, in case the water-cement ratio of 45%. Furthermore, the coefficient of air permeability could become small, it was between 2×10⁻¹⁶m² and 0.1×10⁻¹⁶m².本研究では水セメント比が7031のコンクリートについて、表層品質に及ぼす配合、脱型時期および養生方法の影響を検討した。その結果、材齢1日で脱型し湿布養生を1ヶ月間行うと、水セメント比45の配合においてかぶりコンクリートの圧縮強度は最も増加し、材齢7日で脱型後に気中養生を行った場合の1.5倍となった。一方、材齢1日で脱型し気中養生を行うと、水セメント比53.5の配合においてかぶりコンクリートの圧縮強度は最も低下し、材齢7日で脱型後に気中養生を行った場合の0.7倍となった。また、コンクリートの圧縮強度が大きくなるほど表層透気係数は小さくなる傾向にはあるが、水セメント比を小さくすることによる強度増加よりも養生の影響が大きく、湿布養生を1ヶ月間行うといずれの配合においても表層透気係数は2×10⁻¹⁶m²0.1×10⁻¹⁶m²と小さくなった。

EFFECTS OF MIX PROPORTIONS AND CURING METHODS ON SURFACE PROPERTIES OF CONCRETE