|
Title |
Bond Strength Properties of CFRP Bars according to W/C Ratios and Diameters of the CFRP
|
|
Authors |
김주성(Ju-Sung Kim) ; 정수미(Su-Mi Jeong) ; 김호진(Ho-Jin Kim) ; 김영진(Young-Jin Kim) ; 박선규(Sun-Gyu Park) |
|
DOI |
https://doi.org/10.4334/JKCI.2022.34.6.675 |
|
Keywords |
이형철근; 철근부식; 섬유보강근; 탄소섬유보강근; 부착강도 deformed bar; corrosion; FRP; CFRP; bond strength |
|
Abstract |
Reinforced concrete structures, which are often used in the construction industry, have excellent bonding between the deformed bar and concrete. Reinforced concrete structures have the disadvantage that deteriorating factors permeate into the concrete through cracks on the surface created by various environmental conditions, resulting in corrosion of the deformed bar. To prevent rebar corrosion, many researchers have carried out research on FRP (fiber reinforced polymer). However, FRP has reported problems, including low elastic modulus and limited rebar diameter. CFRP (carbon fiber reinforced plastic), which is a product that complements FRP to address such problems, has been developed. CFRP has excellent chemical and corrosion resistance and are being considered as a solution for deformed bar corrosion. In this study, to confirm the bond strength of CFRP and concrete performance, the bond strength of CFRP and concrete were examined based on concrete strength. The results showed that when the water/cement ratio was low, the bond strength of the CFRP was high. Slip showed maximum bond strength at approximately 3.5 mm. In addition, regarding CFRP diameter, as the diameter increased, the friction area with the concrete also increased, so the bond strength increased. In the future, it will be necessary to study CFRP bond strength properties according to concrete quality, such as unit water content and fine aggregate ratio.
|