실란 커플링제 적용을 통한 CFRP Rebar의 부착 강도 개선 연구
Study on Improving the Bond Strength of CFRP Rebar Through Application of Silane Coupling Agent
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초록
본 연구에서는 탄소 섬유 보강근 표면의 리브 역할을 하는 유리섬유의 부착강도를 증진시키기 위해 다양한 종류의 실란 커플링제를 적용한 뒤 그에 따른 물리적 특성 변화를 확인하였다. 유리섬유 복합체를 이용하여 실란 커플링제가 적용된 최적 배합비를 도출하였으며, 이를 이용하여 직경 10mm 탄소 섬유 보강근을 제작한 뒤 인장강도, 탄성계수, 콘크리트와의 부착강도 실험을 수행하였다. 먼저, 유리 섬유의사이징 제거 유무 및 실란 커플링제 종류에 따른 실험 결과 GS-3TPM 시편이 가장 높은 강도 개선율을 보여 최적 배합비로 선정되었다. GS-3TPM을 적용하여 제작된 탄소 섬유 보강근은 기존 탄소 섬유 보강근 대비 인장강도 및 탄성계수는 약 5% 높은 강도를 가졌으며, 콘크리트와의 부착강도는 약 20%의 개선율을 보였다. 이를 통해 실란 커플링제의 적용은 탄소 섬유 보강근과 콘크리트 간의 부착 강도를 개선시킨다는것을 확인할 수 있었다.
Abstract
In this study, various types of silane coupling agents were applied to enhance the bond strength of the glass fiber, which functions as ribs on the surface of carbon fiber reinforced polymer (CFRP) rebars, and the resulting changes in physical properties were investigated. Using glass fiber composites, the optimal composition ratio of silane coupling agents was derived. Subsequently, CFRP rebars with a diameter of 10 mm were fabricated, and tensile strength, elastic modulus, and bond strength with concrete were tested. Initially, based on experimental results regarding the presence or absence of sizing on glass fibers and the type of silane coupling agent, the GS-3TPM sample exhibited the highest improvement rate, making it the optimal composition. The CFRP rebars manufactured with GS-3TPM showed approximately 5% higher tensile strength and elastic modulus compared to conventional CFRP rebars, and the bond strength with concrete improved by about 20%. This study confirmed that the application of silane coupling agents effectively enhances the bond strength between CFRP rebars and concrete.
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