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A platform for research: civil engineering, architecture and urbanism
Durability of glass fiber-reinforced polymer reinforcing bars in concrete environment
Glass fiber-reinforced polymer (GFRP) materials have emerged as a practical alternative material for producing reinforcing bars for nonprestressed concrete structures. However, their durability in an alkaline environment is still of concern. The study reported in this paper is to evaluate degradation mechanisms of GFRP bars in three types of alkaline environments (NaOH solution, simulated pore-water solution, and embedded in moist concrete) and subject to sustained axial tensile load (22 to 68 % of ultimate tensile strength) in order to identify the critical durability influencing factors, that is, the effect of fiber type, resin type, manufacturing parameters, surface coatings, and suitable combinations of these factors. The following conclusions and recommendations can be drawn: Alkaline ions and moisture could penetrate or diffuse through the resin (or through cracks and voids) to the interphase and fibers and damage the FRP rebars through many mechanisms. It has been shown that Advantex and AR glass fibers have a better resistance to alkaline environments than normal E-glass. The GFRP bars with undercured resins present an increase in moisture and ion penetration compared to fully cured products. Vinyl ester resin (or epoxy) shows low diffusibility and high resistance to alkaline attack and is quite tough in resisting microcrack development.
Durability of glass fiber-reinforced polymer reinforcing bars in concrete environment
Glass fiber-reinforced polymer (GFRP) materials have emerged as a practical alternative material for producing reinforcing bars for nonprestressed concrete structures. However, their durability in an alkaline environment is still of concern. The study reported in this paper is to evaluate degradation mechanisms of GFRP bars in three types of alkaline environments (NaOH solution, simulated pore-water solution, and embedded in moist concrete) and subject to sustained axial tensile load (22 to 68 % of ultimate tensile strength) in order to identify the critical durability influencing factors, that is, the effect of fiber type, resin type, manufacturing parameters, surface coatings, and suitable combinations of these factors. The following conclusions and recommendations can be drawn: Alkaline ions and moisture could penetrate or diffuse through the resin (or through cracks and voids) to the interphase and fibers and damage the FRP rebars through many mechanisms. It has been shown that Advantex and AR glass fibers have a better resistance to alkaline environments than normal E-glass. The GFRP bars with undercured resins present an increase in moisture and ion penetration compared to fully cured products. Vinyl ester resin (or epoxy) shows low diffusibility and high resistance to alkaline attack and is quite tough in resisting microcrack development.
Durability of glass fiber-reinforced polymer reinforcing bars in concrete environment
Haltbarkeit von Verstärkungsstäben aus glasfaservestärktem Kunststoff in einer Betonumgebung
Benmokrane, B. (author) / Wang, P. (author) / Tan Minh Ton-That (author) / Rahman, H. (author) / Robert, J.F. (author)
Journal of Composites for Construction ; 6 ; 143-153
2002
11 Seiten, 14 Bilder, 6 Tabellen, 16 Quellen
Article (Journal)
English
Durability of Glass Fiber-Reinforced Polymer Reinforcing Bars in Concrete Environment
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