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Browse from hundreds of recorded presentations from ACI Conventions and other concrete industry events.
Bond Performance of CFRP-Concrete Joints Subjected to Freeze-Thaw Cycles: Experimental Study and Analytical Analysis Presented by: Ahmed Kallel, University of Sherbrooke
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FRP Bond and Anchorage in Concrete Structures (ACI Spring 2024, New Orleans, LA) The durability of the bond between carbon fiber reinforced polymer (CFRP) and concrete surface under freeze-thaw (FT) cycles is a very significant issue in the application of external CFRP strengthening of reinforced concrete structures. This paper presents an experimental and analytical study on the bond behavior between CFRP and concrete under FT cycles. In this study, the samples were exposed to freeze-thaw cycles in accordance with ASTM C666 where the temperature range varies between -18 °C to +4 °C. Moreover, the bond properties between CFRP and concrete were experimentally evaluated through single lap shear tests and compared with the analytical prediction models proposed in the literature. The failure modes of the control samples as well as the samples exposed to freeze-thaw cycles were presented in this research. In addition, the load-slip behavior was discussed. A non-linear bond-slip relationship between the CFRP-concrete interface was presented at 0, 100, 200, and 300 of freeze-thaw cycles. The results show that the cohesive failure of concrete substrate was observed for the control samples. On the other hand, the mode of the interface failure was changed after exposure to freeze-thaw cycles. In addition, the bond strength of the CFRP-concrete interface increases with increasing freeze-thaw cycles.
October 28 - November 3
Design of FRP-Reinforced Concrete Structures in Europe Presented by: Tommaso D'Antino, Politecnico di Milano
FRP Design Codes and Guidelines (ACI Spring 2024, New Orleans, LA) The presentation provides an overview of the design procedures currently available in Europe for FRP-reinforced concrete structures. The European fib, Italian CNR, and French AFGC guidelines are considered. FRP reinforcement characterization, as well as bending, shear, and anchorage requirements are discussed.
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