Analysis of Correlation Between Flexural Strength and Pore Characteristics on CFRP Rebar by Fabrication Method
Keywords:
Flexural strength, Porosity, Resin temperature, Rib, Correlation coefficientAbstract
In this study, the fabrication conditions of carbon fiber reinforced polymer (CFRP) rebar were controlled to derive the correlation between flexural strength and pore characteristics. The fabrication conditions of CFRP rebar were adjusted for presence or absence of rib, resin temperature, and curing furnace temperature. Flexural strength and pore characteristics of fabricated CFRP rebar were analyzed. The flexural strength of CFRP rebar was changed depending on the fabrication condition, such as the presence or absence of rib, the resin temperature, and the curing furnace temperature. It was confirmed that the flexural strength of CFRP rebar was significantly lowered when the rib was not wound. As a result of Nano X-ray computed tomography (CT) analysis, the maximum pore diameter was shown in CFRP rebar prepared at a resin temperature of 60°C. According to optical microscopic analysis, the maximum porosity was 6.89% in No. 1, and the minimum porosity was 2.88% in No. 7. The correlation coefficient between porosity and flexural strength using optical microscopy was -0.64, which was higher than the correlation coefficient between porosity and pore size using Nano X-ray CT.
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