INHOMOGENEOUS DISTRIBUTION OF THE MOISTURE CONTENT AND POROSITY FROM THE SURFACE LAYER TO INTERNAL PARTS OF DRIED CONCRETE

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  • YUASA Noboru
    Dept. of Architecture and Architectural Eng., College of Industrial Technology, Nihon Univ.
  • KASAI Yoshio
    Dept. of Architecture and Architectural Eng., College of Industrial Technology, Nihon Univ.
  • MATSUI Isamu
    Dept. of Architecture and Architectural Eng., College of Industrial Technology, Nihon Univ.

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  • 乾燥を受けたコンクリートの表層から内部にわたる含水率,細孔構造の不均質性
  • カンソウ オ ウケタ コンクリート ノ ヒョウソウ カラ ナイブ ニ ワタル

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Abstract

Inhomogeneity at the surface layer of structural concretes was studied in terms of pore structures and moisture distributions associated with a drying immediately after the demolding. (1) Weight losses became larger when the drying started earlier, and became smaller when the water-cement ratio became smaller particularly at 30 %. (2) The decrease of moisture content began with the surface layer after the demolding, which was observed, at the age of 28 days, within 5 cm from the surface without regards to the difference in the water-cement ratio. (3) When the drying started earlier, the surface layer has less bound water content than the internal parts. It became conspicuous when the water-cement ratio became smaller. (4) When the drying started earlier and the portion was located closer to the drying front, total pore volume and partial pore volume larger than a radius of 180 or 320 A increased and the volume smaller than the radius decreased, which can be attributed to an interruption of hydration reactions. (5) The porosity of concrete subjected to drying is reflected the pore structure at the demolding age for a long term. When the drying started earlier and the portion was located closer to the drying front, coarser pores were likely to remain. At a temperature of 20 °C , it is preferable for concrete with a water-cement ratio of 60% to be cured in a wet condition until the age of 7-day.

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