打設直後からの乾燥途中におけるコンクリートの含水状態 : 仕上げ材下地としてのコンクリートの含水状態の検討その1

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  • DRYING OF CONCRETE FROM JUST AFTER CAST : Study on moisture behavior in concrete substrate for finishing layers : Part 1
  • 仕上げ材下地としてのコンクリートの含水状態の検討-1-打設直後からの乾燥途中におけるコンクリートの含水状態
  • シアゲザイ シタジ トシテノ コンクリート ノ ガンスイ ジョウタイ ノ ケン

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Premature failures, such as blistering or exfoliation, of finishing layers applied directly on concrete substrate are mainly attributed to excessive moisture in concrete. It is thus important to investigate moisture behavior in concrete before and after layers are applied on it. Moisture distribution in concrete with normal slab thickness is experimentally observed during drying from just after cast in this paper, part 1. The moisture distribution is observed by two measuring methods ; one is done by measuring pore humidity in concrete and the other is weighing broken pieces of concrete for the determination of moisture content. Then the drying behavior is estimated by the numerical calculation based on the theory according to Bazant et al., and the drying model at early age of concrete proposed by the authors. Drying of concrete proceeds very slowly, and much moisture exists in concrete for a very long period. It is basically concluded that drying for longer period in less humid ambience is more desirable for application of layers. It is also found that calculated values, both pore humidity and moisture content agree well with experimental results at early period up to a few months.

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