初期コンクリートに関する圧縮強度と処女応力ひずみ関係式について

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タイトル別名
  • RELATION BETWEEN THE COMPRESSIVE STRENGTH AND THE STRESS-STRAIN CURVE OF CONCRETE BEFORE 28 DAYS
  • ショキ コンクリート ニ カンスル アッシュク キョウド ト ショジョ オウリョクヒズミ カンケイシキ ニ ツイテ

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This paper is a report on behaviers of stress-strain curves and elastic moduli of concrete specimens (150×300mm cylinders)-331 normal and 87 press-treated concrete, which were tested on 1 day, 3 days, 7 days and 28 days. The water cement ratio ranged from 40 to 65%, and the compressive strength 20 to 500kg/cm^2 for the normal and 40 to 600kg/cm^2 for the press-treated. The stress-strain curve was self-recorded by X-Y Recorder. The results are as follows: (1) The stress-strain curve and elastic modulus of early concrete are not concerned with ages and water-cement ratio. (2) The strain values corresponding to the same stress-compressive strength ratio (σ/σ_B) have a linear correlation to the stress values (σ or σ_B), that is δ(n)=P(n)+Q(n) (1) where, δ: strain. σ_B σ: stress. σ_B: compressive strength. n: σ/σ_B. P, Q: coefficients determined by the least square method when σ/σ_B value is fixed, for example, σ/σ_B=0.1, 0.2,……1.0 This linear correlation is concluded not only for the normal, but for the press-treated concrete, though the strength behavier in failure of normal concrete differs from that of press-treated one. (3) The empirical formula of elastic (secant) modulus and stress-strain curve that we propose are as follows: [numerical formula] (2) [numerical formula] (3) where, E(n): secant modulus when σ/σ_B=n. x:σ/σ_B when σ takes an arbitrary value. α, β, γ; α', β', γ': coefficients which are determined by the least square method for P or Q. (4) We can draw stress-strain curve graphically for a certain compressive stregth, if we replace σ_B with σ/n at the formula (1) and draw some linear lines corresponding to σ/σ_B value; i, e, 0.1, 0.2……1.0.

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