Fire Sci. Eng. Search

CLOSE


Fire Sci. Eng. > Volume 29(1); 2015 > Article
Fire Science and Engineering 2015;29(1):1-6.
DOI: https://doi.org/10.7731/KIFSE.2015.29.1.001    Published online February 28, 2015.
충격반향기법을 이용한 화해를 입은 고강도 콘크리트의 탄성파 특성
이준철, 이창준, 김화중, 이지희
1경북대학교 건축토목공학부
2충북대학교 건축공학과
3경북대학교 건축토목공학부
4경북대학교 건축토목공학부
Characteristics of Elastic Wave in Fire damaged High Strength Concrete using Impact-echo Method
Lee Jun Cheol, Lee Chang Joon, Kim Wha Jung, Lee Ji Hee
1School of Architecture and Civil Engineering, Kyungpook National Univ.
2Dept. of Architectural Engineering, Chungbuk National Univ.
3School of Architecture and Civil Engineering, Kyungpook National Univ.
4School of Architecture and Civil Engineering, Kyungpook National Univ.
요약
본 연구에서는 충격반향기법을 이용하여 화해를 입은 고강도 콘크리트의 화재손상정도를 평가하였다. 100 MPa급의 고강도 콘크리트 시편을 제조하여 $100{sim}800^{circ}C$의 고온에 2시간 동안 노출한 후 충격반향기법의 응답스펙트럼을 이용하여 시편의 탄성파 속도를 측정하였으며, 이를 이용하여 동탄성계수를 산출하였다. 이후 직접 압축강도 실험을 통해 시편의 잔존압축강도와 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.
Abstract
In this study, the damages of high strength concrete exposed to high temperature have been evaluated by the impact echo method. Elastic wave velocity and dynamic modulus of elasticity were measured by the impact echo method, and the compressive strength and the static modulus of elasticity were measured by the compression testing method after exposure to high temperature. The results showed that elastic wave velocity has a linear correlation with the compressive strength and dynamic modulus of elasticity has a linear correlation with static modulus of elasticity. Based on results, it is concluded that the impact echo method can be effectively applied to evaluate the mechanical properties of fire damaged high strength concrete.
Key Words: Impact echo method, Fire damage, Elastic wave velocity, Dynamic modulus of elasticity


ABOUT
BROWSE ARTICLES
EDITORIAL POLICY
AUTHOR INFORMATION
Editorial Office
Room 906, The Korea Science Technology Center The first building, 22, Teheran-ro 7 Gil, Gangnam-gu, Seoul, Republic of Korea
Tel: +82-2-555-2450/+82-2-555-2452    Fax: +82-2-3453-5855    E-mail: kifse@hanmail.net                

Copyright © 2024 by Korean Institute of Fire Science and Engineering.

Developed in M2PI

Close layer
prev next