Abstract
C의 고온에 2시간 동안 노출한 후 충격반향기법의 응답스펙트럼을 이용하여시편의 탄성파 속도를 측정하였으며, 이를 이용하여 동탄성계수를 산출하였다. 이후 직접 압축강도 실험을 통해 시편의잔존압축강도와 정탄성계수를 측정하였다. 실험결과, 노출되는 온도가 높을수록 탄성파의 속도, 동탄성계수, 잔존압축강도, 정탄성계수가 저하되는 경향을 나타냈으며, 탄성파 속도와 압축강도, 동탄성계수와 정탄성계수는 선형적인 상관관계를 나타냈다. 따라서 충격반향기법을 이용하여 화해를 입은 고강도 콘크리트의 화재손상정도를 평가하는 것이 가능하다고 판단된다.ABSTRACTIn this study, the damages of high strength concrete exposed to high temperature have been evaluated by the impactecho method. Elastic wave velocity and dynamic modulus of elasticity were measured by the impact echo method, and thecompressive strength and the static modulus of elasticity were measured by the compression testing method after expo-sure to high temperature. The results showed that elastic wave velocity has a linear correlation with the compressivestrength and dynamic modulus of elasticity has a linear correlation with static modulus of elasticity. Based on results, it isconcluded that the impact echo method can be effectively applied to evaluate the mechanical properties of fire damagedhigh strength concrete.Keywords : Impact echo method, Fire damage, Elastic wave velocity, Dynamic modulus of elasticity
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