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Title |
Effects of Atmospheric Pressure Plasma and Nano-Silica Deposition on Bond Performance of Surface-Modified Carbon Fabrics with UHPC
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Authors |
염현수(Hyun-Soo Youm) ; 홍성걸(Sung-Gul Hong) |
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DOI |
https://doi.org/10.4334/JKCI.2022.34.5.475 |
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Keywords |
대기압 플라스마; 부착; 탄소섬유 직물; 나노실리카; 초고성능 콘크리트 atmospheric pressure plasma (APP); bond; carbon fabric; nano-silica; ultra-high-performance concrete (UHPC) |
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Abstract |
In this study, polarity, nano-silica deposition degree, and bond performance of surface-modified carbon fabrics with ultra-high-performance concrete (UHPC) were evaluated. The carbon fabrics were pre-treated by atmospheric pressure plasma (APP) with varying oxygen flow rates to improve their surfacial hydrophilicity as well as bond compatibility with cementitious composites. Test results revealed that the APP treatment significantly changed the carbon fabric’s surfaces, making them hydrophilic. By the way, its degree was shown to be negatively correlated with the oxygen flow rate. Nano-silica deposition degree showed a clear correlation with the improved hydrophilicity of the surfaces, except for the case of high amount of oxygen flow rate. Based on these results from several surface analysis techniques, along with the observed morphological features, the removal scenario of technical sizing agent (SBR) could be considered as a reasonable explanation for these phenomena, which was also consistently demonstrated by the bond test results. These findings can be used to determine the optimal flow rate of oxygen for generating APP, and in a comprehensive manner, it is suggested that the oxygen flow rate should be less than 20 sccm.
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