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플로린화에 의한 표면 개질된 폴리프로필렌 섬유보강 모르타르의 역학적 특성
윤현도(Yun Hyun-Do),이병기(Lee Byouug-Ky),김도수(Kim Do-Su),길배수(Khil Bae-Su),남재현(Nam Jae-Hyun),노재성(Rho Jae-Seong) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.10
Concrete, as the most commonly used construction material, is developing towards high performance, i.e, high strength, high toughness, high durability, and good workability. Shrinkage and permeability resistance of concrete are two Important properties relating to durability. An important measure of improving concrete impermeability is to improve the capability of resisting shrinkage and cracking. Reinforcement of concrete wIth randomly distributed short fibers may Improve the toughness of cementitious matrices by preventing or controlling the initiation, propagation, or coalescence of cracks. The fibers used are mainly steel fibers, carbon fibers, and polymer fibers. Among the polymer fibers, polypropylene fibers have attracted most attention due to the outstanding toughness of concrete reinforced with them. In order to improve the bond strength of polypropylene, various fluorination methods were applied to modify the surfaces of polypropylene fibers.<br/> The effect of the modification of polypropylene fiber surface on the shrinkage and mechanical properties was investigated. Test results indicated that with use of fluorinated polypropylene fiber, it promotes stability strength or flexural strength rather than the specimen added the general mortar and polypropylene fiber. The results showed that resisting on the crack is 97% in the mortar and over 50% than the general polypropylene fiber fluorinated polypropylene fiber mortar wIll be used to construct in contacting with outsides like external wall finish and it will promote workability and durability or crack resIitance.
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