Nowadays Fiber Reinforced Polymers (FRP) represent a well-established technique for structural retrofit of reinforced concrete structural memb ers. However the severe degrade of mechanical properties with temperature and fire conditions represent one of the weakest point of these systems. The present work is aimed at investigating the effectiveness of two fiber reinforced geopolymer based systems in strengthening reinforced concrete (RC) beams. The main outcomes of experimental flexural tests on shallow RC beams strengthened with externally bonded steel and carbon fiber reinforced geopolymers, cured at room temperature are presented. The mechanical behavior of the strengthened beams was evaluated by means of four-points bending tests. A significant increase in the ultimate flexural strength of the reinforced concrete beams was experienced, in case of steel strand reinforcement. The adhesion of geopolymer to the concrete substrate and to the steel strands and the carbon fibers was also evaluated by means of scanning electron microscopy.
Flexural Performance of Shallow Reinforced Concrete Beams Strengthened with Fiber Reinforced Geopolymers / Menna, Costantino; Asprone, Domenico; C., Ferone; F., Colangelo; Balsamo, Alberto; Prota, Andrea; R., Cioffi; Manfredi, Gaetano. - ELETTRONICO. - (2013), pp. 02-662-1-02-662-10. (Intervento presentato al convegno 11th International Symposium on Fiber Reinforced Polymer for Reinforced Concrete Structures tenutosi a Guimaraes (Portugal) nel 26-28 June 2013).
Flexural Performance of Shallow Reinforced Concrete Beams Strengthened with Fiber Reinforced Geopolymers
MENNA, COSTANTINO;Asprone, Domenico;BALSAMO, ALBERTO;PROTA, ANDREA;MANFREDI, GAETANO
2013
Abstract
Nowadays Fiber Reinforced Polymers (FRP) represent a well-established technique for structural retrofit of reinforced concrete structural memb ers. However the severe degrade of mechanical properties with temperature and fire conditions represent one of the weakest point of these systems. The present work is aimed at investigating the effectiveness of two fiber reinforced geopolymer based systems in strengthening reinforced concrete (RC) beams. The main outcomes of experimental flexural tests on shallow RC beams strengthened with externally bonded steel and carbon fiber reinforced geopolymers, cured at room temperature are presented. The mechanical behavior of the strengthened beams was evaluated by means of four-points bending tests. A significant increase in the ultimate flexural strength of the reinforced concrete beams was experienced, in case of steel strand reinforcement. The adhesion of geopolymer to the concrete substrate and to the steel strands and the carbon fibers was also evaluated by means of scanning electron microscopy.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
