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Experimental analysis on bond between PBO-FRCM strengthening materials and concrete
Affiliation:1. Dipartimento di Costruzioni e Restauro, Università di Firenze, Piazza Brunelleschi 6, 50121 Firenze, Italy;2. Dipartimento di Ingegneria Civile, Università di Salerno, Via Ponte Don Melillo, 84084 Fisciano (SA), Italy;3. Università eCampus, Via Isimbardi 10, 22060 Novedrate (CO), Italy;1. University of Salerno, Department of Civil Engineering, Via Ponte Don Melillo, 84084 Fisciano, SA, Italy;2. Roma Tre University, Department of Engineering, Via Vito Volterra 62, 00146 Rome, Italy;1. Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, MO, USA;2. Department of Civil Engineering, University of Calabria, Cosenza, Italy;3. Department of Civil, Chemical, Environmental, and Materials Engineering, University of Bologna, Bologna, Italy;1. Missouri University of Science and Technology, 1401 North Pine Street, Rolla, MO 65409, USA;2. University of Patras, Rio Achaia, Patras, Greece;3. University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy;4. University of Padova, Via Marzolo 9, 35131 Padova, Italy;1. University Claude Bernard Lyon 1, Laboratory of Composite Materials for Construction (LMC2), Site Bohr, 82 Boulevard Niels Bohr, Campus de la DOUA, 69622 Villeurbanne Cedex, France;2. Politecnico of Milano, Department ABC – Architecture, Built Environment and Construction Engineering, Piazza Leonardo da Vinci, 20133 Milano, Italy;3. Roma Tre University, Department of Engineering, Via Vito Volterra 62, 00146 Rome, Italy;4. Telematic University Pegaso, Department of Engineering, Piazza Trieste e Trento 48, 80132 Naples, Italy;5. University eCampus, Via Isimbardi 10, Novedrate (CO), Italy;6. Cracow University of Technology, Warszawska 24, 31-155 Kraków, Poland;7. University “G. d’Annunzio” of Chieti-Pescara, Department of Engineering and Geology, Viale Pindaro 42, 65127 Pescara, Italy;1. Department of Architecture, Built Environment and Construction Engineering, Politecnico di Milano (PoliMi), Milan, Italy;2. CIRI Buildings and Construction, University of Bologna (UniBO), Bologna, Italy;3. Department of Civil Engineering, University of Patras (UPatras), Patras, Greece;4. Department of Engineering, Roma3 University (UniRM3), Rome, Italy;5. University eCampus (UnieCampus), Novedrate, Italy;6. Faculty of Civil Engineering, Cracow University of Technology (CUT), Cracow, Poland;7. Certimac c/o Enea Temaf (Certimac), Laboratorio di ricerca analisi e prove, Faenza, Italy;8. University Claude Bernard Lyon 1 (Unilyon), Laboratory of Composite Materials for Construction (LMC2), Lyon, France;9. Department of Engineering for Innovation (UniLE), University of Salento, Lecce, Italy;10. Department of Civil, Architectural and Environmental Engineering, University of Padova (UniPD), Padua, Italy
Abstract:The effectiveness of externally bonded strengthening for reinforced concrete (RC) elements strongly depends on the bond between the strengthening material and the concrete and on the mechanical properties of the concrete cover. In this paper the bond between fiber reinforced cementitious matrix (FRCM) materials made out of a poliparafenilenbenzobisoxazole (PBO) net embedded in a cement based matrix and the concrete is experimentally analyzed. Experimental results of double shear tests involving different bond lengths and fibers cross sections are presented. The results allow to estimate the effective anchorage length and evidence that the debonding occurs at the fibers/matrix interface after a considerable fibers/matrix slip. They also confirms the effectiveness of the FRCM materials as external reinforcements for concrete. The obtained experimental results can be used to calibrate a local bond-slip relation to be used in the design of the external reinforcement.
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