Title:
SRP/SRG Strips Bonded to Concrete Substrate: Experimental Characterization
Author(s):
Francesco Ascione, Marco Lamberti, Annalisa Napoli, and Roberto Realfonzo
Publication:
Symposium Paper
Volume:
326
Issue:
Appears on pages(s):
110.1-110.10
Keywords:
bond; concrete substrate, experimental tests, steel reinforced grout (SRG), steel reinforced polymer (SRP
DOI:
10.14359/51711093
Date:
8/10/2018
Abstract:
Steel reinforced polymer (SRP) and steel reinforced grout (SRG) systems have recently gained popularity in the field of external strengthening and repairing of existing structures. They consist of composite materials made of high strength steel cords embedded in polymeric or inorganic matrices and applied to the structural member via wet lay-up. Experimental studies have frequently shown the potentials of these innovative composite systems in improving the performance of concrete and masonry structures. However, additional studies are required to expand the existing knowledge and to develop specific design guidelines. The present paper contributes to filling some of the foregoing knowledge gaps by discussing the experimental results of 50 direct single-lap shear tests performed to investigate the bond behavior between SRP/SRG reinforcement and concrete substrate. Useful considerations are provided in terms of failure mode, bond strength and effective bonded length of the SRP/SRG strips based on the variability of the following main parameters: density of the steel fabric, bonded interface length, number of layers composing the strip, and width of the bonded strip.
Related References:
1. Matana, M., Nanni, A., Dharani, L.R., Silva, P., Tunis, G., “Bond Performance of steel reinforced polymer and steel reinforced grout,” In: Proceedings Int. Symp. on bond behaviour of FRP in structures (BBFS), Hong Kong, China, 2005.
2. Matana, M., Galecki, G., Maerz, N., Nanni, A., “Concrete substrate preparation and characterization prior to the adhesion of externally bonded reinforcement,” In: Proceedings Int. Symp. on bond behaviour of FRP in structures (BBFS), Hong Kong, China, 2005.
3. Lopez, A., Galati, N., Alkhrdaji, T., Nanni, A., “Strengthening of a reinforced concrete bridge with externally bonded Steel Reinforced Polymer (SRP),” Composites Part B: Eng., V. 38, 2007, pp. 429-436.
4. Ceroni, F., Pecce, M., “Cracking behaviour of RC beams externally strengthened with emerging materials,” Construction and Building Materials, V. 21, No. 4, 2007, pp. 736-745.
5. Mitolidis, G.J., Salonikios, T.N., Kappos, A.J., “Mechanical and bond characteristics of SRP and CFRP reinforcement: a comparative research,” The Open Construction & Building Technology J., V. 2, 2008; pp. 207-216.
6. Minnaugh, P.L., Harries, K.A., “Fatigue Behaviour of Externally bonded steel fiber reinforced polymer (SFRP) for retrofit of reinforced concrete”, Materials and Structures, V. 42, 2009, pp. 271-280.
7. Capozucca, R., “Experimental FRP/SRP historic masonry delamination,” Composite Structures, V. 92, 2010, pp. 891-903.
8. Manos, G.C., Katakalos, K., Kourtides, V., “The influence of concrete surface preparation when fiber reinforced polymers with different anchoring devices are being applied for strengthening R/C structural members”, Applied Mechanics and Materials, V. 82, 2011, pp. 600-605.
9. Valluzzi, M.R., Oliveira, D.V., Caratelli, A, Castori, G., Corradi, M., de Felice, G. et al., “Round robin test for composite to brick shear bond characterization”, Materials and Structures, V. 45, 2012, pp. 1761-1791.
10. Stievanin, E., da Porto, F., Panizza, M., Garbin, E., Modena, C., “Bond characterization between historical concrete substrate and SRG/SRP strengthening systems,” In: Proceedings of 5th Int. Conf. on Structural Engineering, Mechanics and Computation (SEMC2013), Cape Town, South Africa, 2013.
11. Napoli, A., Realfonzo, R., “Reinforced concrete beams strengthened with SRP/SRG systems: experimental investigation,” Construction and Building Materials, V. 93, 2015, pp. 654–77.
12. Napoli, A., de Felice, G., De Santis, S., Realfonzo, R., “Bond behaviour of steel reinforced polymer strengthening systems,” Composite Structures, V. 152, 2016, pp. 499-515.
13. Napoli, A., Realfonzo, R., “Compressive behaviour of concrete confined by SRP wraps,” Construction and Building Materials, V. 127, 2016, pp. 993–1008.
14. Santandrea, M., Imohamed, I.A.O., Carloni, C., Mazzotti, C., de Miranda, S., Ubertini, F., “A study of the debonding mechanism in steel and basalt FRCM-masonry joints,” In: Brick and Block Masonry: Proceedings of the 16th international brick and block masonry conference, Padova, Italy, 2016, pp. 433–40.
15. De Vita, A., Napoli, A., Realfonzo, R., “Full Scale RC Beam-Column Joints Strengthened with Steel Reinforced Polymer Systems,” Frontiers in Materials, V. 4, 2017, pp. 1-17.
16. Sneed, L.H., Ravazdezh, F., Santandrea, M., Imohamed, I.A.O., Carloni, C.A., “Study of the compressive behavior of concrete columns confined with SRP jackets using digital image analysis,” Composite Structures, V. 179, 2017, pp. 195–207.
17. De Santis, S., de Felice, G., Napoli, A., Realfonzo, R., “Strengthening of structures with Steel Reinforced Polymers: a state-of-the-art review,” Composites Part B: Engineering, V. 104, 2016, pp. 87-110.
18. Ascione, F., Lamberti, M., Napoli, A., Razaqpur, G., Realfonzo, R., “An experimental investigation on the bond behaviour of steel reinforced polymers on concrete substrate,” Composite Structures, 2017, V. 181, pp. 58-72.
19. Carloni, C., Santandrea, M., Imohamed, I.A.O., “Determination of the interfacial properties of SRP strips bonded to concrete and comparison between single-lap and notched beam tests,” Engineering Fracture Mechanics, V. 186, 2017, pp. 80–104.
20. Ascione, F., Lamberti, M., Napoli, A., Realfonzo, R., “Bond behaviour of steel FRP/FRCM systems on concrete substrates: an experimental investigation,” In: Proceedings of XVII Convegno Anidis: L’Ingegneria Sismica in Italia, Pistoia, Italy, 2017.
21. Kerakoll Spa, web site: www.kerakoll.com accessed November 2017..
22. Chen, J.F., Teng, J.G., “Anchorage strength models for FRP and steel plates bonded to concrete,” J. of Structural Engineering, V. 127(7), 2001, pp. 784-791.