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Title |
Analysis of Physical Properties and Microstructure of CFRP Rebars Manufactured according to Various Process Conditions
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Authors |
권도영(Do-Young Kwon) ; 김남일(Nam-Il Kim) ; 염우성(Woo Sung Yum) ; 추용식(Yong-Sik Chu) |
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DOI |
https://doi.org/10.4334/JKCI.2023.35.2.207 |
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Keywords |
탄소섬유 보강근; 기공율; 인장강도; 탄성계수; 미세구조분석 CFRP rebar; porosity; tensile strength; elastic modulus; microstructure analysis |
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Abstract |
In this study, carbon fiber reinforced plastic (CFRP) rebars were manufactured by varying with the different pilot process conditions, and subsequently the tensile strength, elastic modulus, and pore characteristics of the CFRP rebars were measured. X-ray CT and optical microscopy analysis showed that the presence of pores in all CFRP rebars, and most pores were observed between the carbon fibers. The porosity varied depending on conditions such as the resin bath immersion temperature, curing temperature, and other factors, and thus the pilot process conditions had a close correlation with the porosity. The tensile strength of the CFRP rebars manufactured in this study ranged from 2,979 to 3,430 MPa, and the elastic modulus ranged from 165 to 195 GPa. The maximum tensile strength was 3,430 MPa, and the elastic modulus was 172 GPa. The maximum values obtained in this study showed an increase in tensile strength of approximately 56 % and an increase in elastic modulus of approximately 43 % compared to existing CFRP rebars.
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