マスコンクリート中の温度とひずみについて

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タイトル別名
  • Some Measurements of the Temparature and Strains in a Massive Concrete Structure
  • マス コンクリートチュウ ノ オンド ト ヒズミ ニ ツイテ

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Recently, relatively massive concrete has been placed in the construction of the reservoir for waterworks. It has been frequently reported that the cracks in the vertical direction occured in the mass concrete. The cracks may mainly be caused by the thermal stresses arising from the restraint of the contraction of concrete at the heat dissipation. The measurements of the temperature and strains in a massive concrete reservoir were carried out to reveal the effect of the temperature rise on the tensile stresse induced on the surface of the concrete structure, giving the fundamental data for the control of cracking in massive concrete. The major conclusions obtained are as follows: (1)The temperatures reach maxima 14 to 23 hours after placement of concrete, the maximum temperatures ranging from 20℃to 25℃in the massive concrete investigated here.(2)The extensometers embedded in the various positions show the ultimate tensile strains smaller than 50 x 10⁻⁶ in the concrete structure in which any crack does not occur.(3)It is found that the tensile stresses on the surface calculated using the strains measured were so small that the mass concrete did not crack.

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