Highly accelerated lifetime for externally applied bond critical fiber-reinforced polymer (FRP) infrastructure materials.
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2014-03-01
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Abstract:This report describes a research project to investigate accelerated aging protocols for fiber-reinforced
polymer (FRP) reinforcement of concrete. This research was conducted in three stages. In the first
stage, various spectroscopic techniques were used to investigate the chemical bonding between epoxy
and cement. Evidence suggests that hydrogen bonding may occur at the epoxy-cement interface. Next,
degradation of epoxy properties and the corresponding degradation mechanisms during accelerated
aging were examined. Low temperature water immersion resulted in loss of properties due to water
absorption, while high immersion temperatures or low immersion temperatures in combination with UV
exposure resulted in loss of properties due to chemical changes in the epoxy resin. Finally, the aging
protocols identified for the epoxies were used to examine durability of concrete beams reinforced with
FRP. Loss in beam strength due to aging from this study was combined with data from a published
NCHRP project to determine bond durability factors for use in design. These factors were determined to
be 0.4 for wet layup without putty and 0.6 for wet layup with putty.
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