養生過程で温度履歴を受けたセメント硬化体の力学的性質に対する推定法とその適合性

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タイトル別名
  • ESTIMATION METHOD FOR MECHANICAL PROPERTIES OF HARDENED CEMENT COMPOSITES CURED IN VARYING TEMPERATURES
  • ヨウジョウ カテイ デ オンド リレキ オ ウケタ セメント コウカタイ ノ リキガクテキ セイシツ ニ タイスル スイテイホウ ト ソノ テキゴウセイ

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While concrete properties are influenced by curing temperature history, their variation can be described by a unique function by introducing a concept of equivalent age if the activation energy is rationally determined. In this study, cement paste, mortar and concrete are made with two types of cement, ordinary Portland cement and low-heat Portland cement. They are cured at a constant temperature of 20℃, 40℃ or 60℃ until the test age. Compressive strength, static modulus of elasticity, dynamic modulus of elasticity and fracture energy are determined. Determined values are compared with estimated values by means of the equivalent age and the conformity is evaluated. The estimated values were obtained by activation energy determined with measured values until 28 day. Then estimated values for 91 days are compared with the corresponding measured values. Furthermore, it is shown that coefficients in the estimation formula described as a function of curing temperatures achieve a higher precision for the estimation.

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