高温度における普通強度コンクリートの力学的特性

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  • MECHANICAL PROPERTIES OF MODERATE STRENGTH CONCRETE AT HIGH TEMPERATURES
  • コウオンド ニ オケル フツウ キョウド コンクリート ノ リキガクテキ トクセイ

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The effects of high temperature on the mechanical properties of moderate strength concrete (MSC) have been studied experimentally at various temperatures that covered the 20℃ and the 100 to 800℃ temperature range at 100℃ increments. Concrete specimens of MSC were tested under compression at ages about 14 years. The stress-strain curve under compression test shows that MSC exhibits brittle properties below 500℃, and ductile properties above 500℃. The compressive strength decreases below 100℃ during heating, increases up to about the same strength of room temperature below 200℃ and gradually decreases with further increase of temperature. From these test results (including Ref.9 test results), mathematical expressions of the compressive strength, the strain at compressive strength, the stress-strain relationship and the modulus of elasticity were proposed. The comparatively good correlation between predicted and experimental results indicates the adequacy of the expression of stress-strain relationship.

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