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      • KCI등재후보

        Bond and durability investigation of basalt fiber and PEN fiber reinforced composites for concrete applications

        최동욱,김영호,Batzaya Baasankuu,CHINZORIGT GOMBOSUREN 아시아콘크리트학회 2020 Journal of Asian Concrete Federation Vol.6 No.1

        Bond and durability characteristics of basalt fiber reinforced polymer (BFRP) and polyethylene naphthalate (PEN) fiber/PEN FRP were investigated. Magnitude and distribution of the bond stress between BFRP/PEN FRP and concrete were investigated by double lap shear test. Four different types of durability test were performed: (1) Beam bond test following accelerated conditioning protocols by ACI 440.9R using plain concrete beams strengthened with BFRP or PEN FRP; (2) tensile test of PEN fiber/PEN FRP after immersion in 1N NaOH, 3% NaCl solutions, and water up to 6 months; (3) tensile test of PEN fiber/PEN FRP after immersion in 5% and 10% diluted solutions of HCl; and (4) exposure to natural outdoor environment. Bond test results indicated high bond stress developing over relatively short distance for BFRP that has high elastic modulus (EBF = 68.4 GPa) while relatively low bond stress developing over longer length for PEN FRP that has low elastic modulus (EPEN = 17.4 GPa). In the beam bond test, very good behavior was shown by PEN FRP after 4 month’s exposure to wet and alkaline conditions while moderate behavior was shown by BFRP. Overall, the performance of PEN fiber/FRP was satisfactory in all durability tests conducted in this study.

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