Abstract

노후 콘크리트 구조물은 시간의 경과에 따라 노후화되고, 열악한 외부 환경에 노출되어 부재 및 재료자체의 성능이 저하된다. 콘크리트 구조물의 성능 향상을 위한 다양한 시도 중에서 긴장력을 도입한 CFRP 긴장재를 이용한 표면 매립(Near Surface Mounted, NSM) 공법을 적용하여 구조물을 보수보강하기 위한 연구가 진행 중이다. CFRP 긴장재를 이용한 표면 매립 공법은 기존 콘크리트와 충전재, CFRP 긴장재가 서로 물성이 다르기 때문에 이에 대한 역학적 특성을 고려하여야 한다. 본 연구는 기존 콘크리트와 CFRP 긴장재 사이에 무수축 모르타르, 에폭시 퍼티, 에폭시 모르타르의 3가지 충전재로 충진하고, 총 18개의 실험체를 제작하여 온도변화(<TEX>$-15^{\circ}C{\sim}55^{\circ}C$</TEX>) 환경에서의 인발실험을 통하여 부착특성 및 파괴형상을 분석하였다. Most of the tendons used in prestress concrete structures are made of steel which is vulnerable to corrosion in external environment. In order to solve strengthen efficiently the structure, active research has been widely conducted on the Near Surface Mounted (NSM) strengthening method using carbon fiber reinforced polymer (CFRP) tendon. This study is to investigate adhesive properties depending on the temperature variation(<TEX>$-15^{\circ}C{\sim}55^{\circ}C$</TEX>) of NSM method by filler. Total 18 cubic specimens were fabricated and pull-out tests were conducted. Bond behavior including bond strength under temperature variation and failure mode was analyzed and discussed.

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