2019 CSCE Annual Conference - Laval (Greater Montreal)

2019 CSCE Annual Conference - Laval (Greater Montreal) Conference


Title
Impact of elevated temperature, chemical and workmanship on performance of beams with near surface mounted FRP bars

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Author(s)
Mr. Mahmoud Metwally, The American University in Cairo
Dr. Mohamed N. Abou-Zeid, The American University in Cairo (Presenter)
Abstract

Near surface mounted (NSM) is growing exponentially into the strengthening and repair of concrete structures over the past decades worldwide. CFRP NSM offers a superior strength over conventional steel reinforcement as well as a good durability in various environmental service conditions. However, the effect of elevated temperature, adhesiveness and chemicals has not been sufficiently studied. This study aims at assessing the impact of elevated temperatures, adhesives, and chemicals on beams exposed to flexural loading. To meet this objective, a set of 60 beams were prepared with locally available NSM and exposed to temperatures of 70, 120 and 180 °C for 1, 2, 4 and 8 hours. Beams were also evaluated with three levels of adhesiveness placement and were also exposed to five weeks of wetting and drying in fresh water, brine water and magnesium Sulphate. The results of this work reveal that CFRP bars NSM mounted at a depth of 25 mm introduces more than double flexural strength of conventional steel reinforced beams. Exposure to different degree temperature at various duration, placement of adhesive and exposure to chemicals all lead to substantial drop in the flexural strength and thus affect the potential gain of NSM. This study should be resumed by future research work to validate the findings on one hand and to examine the effect of numerous other parameters. Construction industry needs to be aware of the findings of this work to make better use of its implementation in future repair and retrofitting. Keywords: (Near Surface Mounted, Fibre Reinforced Polymer, Repair and Retrofitting, elevated temperature, adhesive, chemicals)