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Title |
Effect of Aggregate on Mechanical Properties of Ultra-High Strength Concrete Exposed to High Temperature
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Authors |
김영선 ; 최형길 ; 大宮喜文(Yoshifumi Ohmiya) ; 김규용 |
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Keywords |
초고강도 콘크리트 ; 화재 ; 잔골재율 ; 굵은 골재 최대 치수 ; 잔존 역학적 특성 ultra-high strength concrete ; fire ; fine aggregate/aggregate ratio ; maximum size of coarse aggregate ; residual mechanicla properties |
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Abstract |
Concrete structures exposed to fire produce changes in their internal structure, resulting in their service life reduction due to the deterioration of its strength and performance capacity. The deterioration level are dependent on the temperature, exposure time, concrete mix proportions, aggregate property, and material properties. This study was performed to evaluate the thermal behavior of ultra-high strength concrete for the parameters of water to cement ratio (compressive strength), fine to total aggregate ratio, and maximum coarse aggregate size. At room temperature and 500oC, tests of ultrasonic pulse velocity, resonance frequency, static modulus of elasticity, and compressive strength are performed using ?100 × 200 mm cylindrical concrete specimens. The results showed that the residual mechanical properties of ultra-high strength concrete heated to 500oC is influenced by variation of a water to binder ratio, fine to total aggregate ratio, and maximum coarse aggregate size.
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