Page 1 of 8 BOND BETWEEN MULTIDIRECTIONAL LAMINATES OF CFRP AND CONCRETE Mário COELHO Ph.D. Student ISISE, University of Minho, Department of Civil Engineering Azurém, 4800-058 Guimarães, PORTUGAL [email protected] Pedro FERNANDES Ph.D. Student ISISE, University of Minho, Department of Civil Engineering Azurém, 4800-058 Guimarães, PORTUGAL [email protected] José SENA-CRUZ Assistant Professor ISISE, University of Minho, Department of Civil Engineering Azurém, 4800-058 Guimarães, PORTUGAL [email protected] * Joaquim BARROS Full Professor ISISE, University of Minho, Department of Civil Engineering Azurém, 4800-058 Guimarães, PORTUGAL [email protected] Abstract The Mechanically Fastened and Externally Bonded Reinforcement (MF-EBR) technique has been proposed for the strengthening of reinforced concrete (RC) structures. This retrofit system uses multidirectional carbon fibre reinforced polymer (CFRP) laminates fixed to concrete with epoxy adhesive and metallic anchors. With the aim of studying the bond behaviour of the MF-EBR system and compare with some existing ones, mainly the Mechanically Fastened-FRP (MF-FRP) and Externally Bonded Reinforcement (EBR), an experimental program composed by direct pullout tests was carried. The instrumentation includes the measurement of the applied pullout force and the loaded end slip. The strengthening effectiveness of the analyzed techniques (EBR, MF-FRP and MF-EBR) was investigated, as well as the influence on the bond performance of the bond length, diameter of the anchors and level of applied prestress to the anchors. The present work describes the carried-out tests and presents and analyzes the most significant obtained results. Keywords: MF-EBR, MF-FRP and EBR strengthening techniques; direct pullout test; bond behaviour. 1. Introduction The FRP’s that are being used in the structural strengthening of concrete elements are practically limited to unidirectional-fibre systems applied according to the following techniques [1]: (i) application of fabrics (in situ cured systems) or laminates glued externally on the surface of the element to strengthen (EBR – Externally Bonded Reinforcement); (ii) insertion of laminates (or rods) into slits opened on the concrete cover (NSM – Near-Surface
BOND BETWEEN MULTIDIRECTIONAL LAMINATES OF CFRP AND CONCRETE
Jun 19, 2023
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