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Title |
Effect of Mechanical Properties of SiO2 Coated Carbon Fiber Reinforced Mortar Composites
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Authors |
허광희(Gwang-Hee Heo) ; 송기창(Ki-Chang Song) ; 박종건(Jong-Gun Park) ; 박종호(Jong-Ho Park) ; 전형민(Hyung-Min Jun) |
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DOI |
https://doi.org/10.4334/JKCI.2020.32.1.065 |
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Keywords |
탄소섬유 보강 모르타르(CFRM); 실리카; 섬유혼입률; 휨강도; 칼슘실리케이트 수화물(C-S-H) carbon fiber reinforced mortar (CFRM); SiO2; fiber volume fractions; flexural strength; calcium silicate hydrate (C-S-H) |
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Abstract |
This study presented a method of coating SiO2 on the surface of carbon fiber as it produces calcium silicate hydrate (C-S-H) when reacted with Ca(OH)2 to improve the adhesion performance of carbon fiber in cement matrix. Using this, the mechanical properties of SiO2 coated carbon fiber reinforced mortar (CFRM) composites and uncoated CFRM composites with silica fume substitution and different fiber volume fractions were compared and analyzed. After the strength test, the interfacial bonding state (IBS) between the fiber and the cement matrix was observed through SEM and FR-IR. CFRM composites and plain mortar were carried out a flow value, flexural and compressive strength tests, respectively. At this time, the content of silica fume is 5 wt% and the fiber volume fractions is 0.5~2.0 vol% with 0.5 vol% variation. Results showed that regardless of the coating of the fibers, the flow value and compressive strength of the CFRM composites gradually decreased with increasing fiber volume fractions compared to plain mortar. On the other hand, the flexural strength of CFRM composites was confirmed that the flexural strength increased with increasing fiber volume fractions, except for CFRM composites 2.0 vol% fibers without silica fume substitution. In particular, SiO2 coated CFRM composites with 5 wt% substituted silica fume and 2.0 vol% fibers simultaneously, which were CCS5-2.0 specimens showed the highest flexural strength. Therefore, the CCS5-2.0 specimens manufactured in this study were confirmed to have the greatest flexural strength, and this method was found to be very effective for the improvement of flexural strength.
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