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Title |
Bond Strength Properties of Cement Mortar and Fiber Interfaces according to Nano-Silica Particles Modification of Basalt Fiber
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Authors |
서동주(Dong-Ju Seo) ; 박종건(Jong-Gun Park) ; 권호찬(Ho-Chan Kwon) ; 송기창(Ki-Chang Song) ; 허광희(Gwang-Hee Heo) |
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DOI |
https://doi.org/10.4334/JKCI.2024.36.2.111 |
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Keywords |
현무암 섬유; 나노실리카; 표면개질; 부착강도; 현무암 섬유 시멘트 모르타르(BFCM) basalt fiber; nano-silica; surface modification; bond strength; basalt fiber cement mortar (BFCM) |
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Abstract |
Basalt fiber exhibits notably low bonding performance with cement-based composites, limiting its application as a construction material. We aimed to enhance the interfacial bond properties of basalt fibers in cement mortar by modifying their surface with nano-silica particles through chemical bonding of GPTMS (glycidoxypropyl trimethoxysilane) and TEOS (tetraethyl orthosilicate), a silane coupling agent. The composition and microstructure of the basalt fiber were characterized and analyzed using SEM, EDS, and FT-IR imaging techniques. The resulting nano-silica particles were completely covered and uniformly distributed on the surface of the basalt fibers, forming a thin layer. In addition, a single fiber pull-out test was performed to verify the effect of the new surface modification method on the interfacial bond strength of basalt fibers embedded in cement mortar. The experimental results showed that the interfacial bond strength of basalt fiber cement mortar (BFCM) modified with nano-silica was significantly enhanced compared to unmodified BFCM. Single fiber pull-out experiments and SEM analysis revealed that nano-silica particles on the surface of basalt fibers increased the interfacial bond strength between the fibers and the cement matrix. This enhancement facilitated the bridging effect of basalt fibers in the cement mortar, ultimately improving the interfacial bond strength of the cement mortar.
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