Experimental Study of the Bond of FRP Applied to Natural Stones and Masonry Prisms

Abstract:

Compared to more traditional techniques, the application of Externally Bonded-Fibre Reinforced Polymers (EB-FRP) represents a viable alternative for the strengthening of masonry structures, also in case of Cultural Heritage buildings where strict requirements need to be met, aimed at minimizing the impact of the intervention. Since the FRP-to-masonry bond behaviour strongly affects design and effectiveness of such interventions, several investigations have been carried out in recent years to study this phenomenon, generally based on the longer experience developed for concrete substrates. Mortar joints, which are geometrical and mechanical discontinuities, distinguish and characterize masonry substrates from concrete ones, and therefore deserve a special attention as far as their role in the bond behaviour is not clarified yet. This paper, aimed at giving a contribution also from a methodological point of view, presents the main experimental results of shear tests carried out on glass composites (GFRP) applied to natural calcareous stones (pietra leccese), to lime mortar blocks and to masonry prisms made by coupling stones and lime mortar. Overall 22 shear tests were performed, keeping a bonded length of 200 mm for stones and mortar specimens while it was changed from 65 mm (corresponding to one stone and one mortar joint) to 195 mm (three stones and three mortar joints) in the case of masonry prisms. The effect of the FRP end anchorage on the test development was investigated as well, and results of the experimental tests are herein discussed in detail.

• Periodical: Key Engineering Materials (Volume 624)
• Pages: 453-460
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.624.453
• Online since: September 2014
• Authors: Matteo Panizza*, Enrico Garbin, Maria Rosa Valluzzi, Claudio Modena
• Keywords: Bond, Composite Material, Experimental Testing, FRP, Stone Masonry, Strengthening

References

[1] T. Triantafillou, Strengthening of masonry structures using epoxy-bonded FRP laminates, J Compos Constr 2/2 (1998) 96-104.

DOI: 10.1061/(asce)1090-0268(1998)2:2(96)

[2] N. G. Shrive, The use of fibre reinforced polymers to improve seismic resistance of masonry, Constr Build Mater 20 (2006) 269-277.

DOI: 10.1016/j.conbuildmat.2005.08.030

[3] C. Modena, Design approaches of interventions for the safety and conservation of historic buildings, Proc. IV Int. Sem. of Structural Analysis of Historical Constructions - SAHC04, Padova (Italy), November 10-13 2004, 75-83.

[4] M. R. Valluzzi, Strengthening of masonry structures with Fibre Reinforced Plastics: from modern conception to historical building preservation, Proc. VI Int. Conf. on Structural Analysis of Historic Constructions - SAHC08, Bath (UK), July 2-4 2008, 33-45.

DOI: 10.1201/9781439828229.ch4

[5] U. Meier, Strengthening of structures using carbon fibre/epoxy composites, Constr Build Mater 9/6 (1995) 341-351.

[6] C.G. Papanicolaou, T.C. Triantafillou, K. Karlos, M. Papathanasiou, Textile-reinforced mortar (TRM) versus FRP as strengthening material of URM walls: in-plane cyclic loading. Mater Struct 40/10 (2007) 1081-1097.

DOI: 10.1617/s11527-006-9207-8

[7] C.G. Papanicolaou, T.C. Triantafillou, M. Papathanasiou, K. Karlos, Textile reinforced mortar (TRM) versus FRP as strengthening material of URM walls: out-of-plane cyclic loading. Mater Struct 41/1 (2008) 143-157.

DOI: 10.1617/s11527-007-9226-0

[8] M.R. Valluzzi, F. da Porto, E. Garbin, M. Panizza, Out-of-plane strengthening of infill masonry walls with composites materials, Proc. 12th Canadian Masonry Symposium – CMS2013, Vancouver (Canada), June 2-5 (2013).

DOI: 10.1617/s11527-014-0384-6

[9] L. Garmendia, P. Larrinaga, D. García, I. Marcos, Textile-Reinforced Mortar as Strengthening Material for Masonry Arches. Int J Archit Herit, 8/5 (2014) 627-648.

DOI: 10.1080/15583058.2012.704480

[10] C. Menna, D. Asprone, C. Ferone, F. Colangelo, A. Balsamo, A. Prota, R. Cioffi, G. Manfredi, Use of geopolymers for composite external reinforcement of RC members, Compos Part B-Eng, 45/1 (2013) 1667-1676.

DOI: 10.1016/j.compositesb.2012.09.019

[11] Tamburini, S., Favaro, M., Magro, A., Garbin, E., Panizza, M., Nardon, F., Valluzzi, M.R.: Geopolymers as strengthening materials for Built Heritage. In: Proc. of Built Heritage 2013: Monitoring Conservation Management, Milan (Italy), November 18-20 (2013).

[12] E. Garbin, M. Panizza, M.R. Valluzzi, F. Nardon, S. Tamburini, M. Favaro, A. Magro, Characterization of Fibre Reinforced Geopolymers as structural strengthening material for brick masonry, Proc. 9th Int. Masonry Conference - IMC9, Guimarães (Portugal), July 7-9 (2014).

DOI: 10.23967/sahc.2021.110

[13] M. Panizza, E. Garbin, M.R. Valluzzi, C. Modena, Bond Behaviour of CFRP and GFRP Laminates on Brick Masonry, Proc. VI Int. Conf. on Structural Analysis of Historic Constructions - SAHC08, Bath (UK), July 2-4 2008, 763-770.

DOI: 10.1201/9781439828229.ch86

[14] E. Grande, M. Imbimbo, E. Sacco, FRP-strengthening of masonry structures: effect of debonding phenomenon, Proc. VI Int. Conf. on Structural Analysis of Historic Constructions - SAHC08, Bath (UK), July 2-4 2008, 1017-1023.

DOI: 10.1201/9781439828229.pt8

[15] S. Briccoli Bati, L. Rovero, Bond strength between brick and CFRP strips, Proc. III It. Nat. Conf. on Mechanics of masonry structures strengthened with composite materials: modeling, testing, design, control - MuRiCo3, Venice (Italy), April 1-3 2009, 146-152.

[16] C. Faella, E. Martinelli, S. Paciello, F. Perri, Composite materials for masonry structures: the adhesion issue, Proc. III It. Nat. Conf. on Mechanics of masonry structures strengthened with composite materials: modeling, testing, design, control - MuRiCo3, Venice (Italy), April 1-3 2009, 266-273.

[17] R. Capozucca, Experimental FRP/SRP-historic masonry delamination, Compos Struct 92 (2010) 891-903.

DOI: 10.1016/j.compstruct.2009.09.029

[18] E. Grande, M. Imbimbo, E. Sacco, Bond Behavior of Historical Clay Bricks Strengthened with Steel Reinforced Polymers (SRP), Mateg9 4 (2011) 585-600.

DOI: 10.3390/ma4030585

[19] M. Accardi, L. La Mendola, Stress transfer at the interface of bonded joints between FRP and calcarenite natural stone, Proc. IV Int. Sem. of Structural Analysis of Historical Constructions SAHC04, Padova (Italy), November 10-13 2004, 867-874.

[20] M.A. Aiello, S.M. Sciolti, Bond analysis of masonry structures strengthened with CFRP sheets, Constr Build Mater 20 (2006) 90-100.

DOI: 10.1016/j.conbuildmat.2005.06.040

[21] F. Ceroni, A. Garofano, M. Pecce, Bond tests on tuff elements externally bonded with FRP materials, Mater Struct (2014), DOI 10. 1617/s11527-014-0295-6.

DOI: 10.1617/s11527-014-0295-6

[22] M. Panizza, E. Garbin, M.R. Valluzzi, C. Modena, Experimental calibration of the bond strength of FRP, externally glued on masonry elements, based on design provisions, Proc. Int. RILEM Conf. on Advances in Construction Materials Through Science and Engineering, Hong Kong (China), September 5-7 (2011).

DOI: 10.4028/www.scientific.net/kem.624.453

[23] M. Casareto, A. Olivieri, A. Romelli, S. Lagomarsino, Bond behaviour of FRP laminates adherent to masonry, Proc. Int. Conf. Advancing with Composites - PLAST 2003, Milan (Italy), May 7-9 (2003).

[24] A.N. Cancelli, M. A. Aiello, P. Casadei, Experimental investigation on bond properties of SRP/SRG—masonry systems, Proc. 8th Int. Symp. on Fiber Reinforced Polymer Reinforcement for Concrete Structures - FRPRCS-8, Patras (Greece), July 16-18 (2007).

[25] C. Carloni, K.V. Subramaniam, Investigation of the Interface Fracture during Debonding between FRP and Masonry, Adv Struct Eng 12/5 (2009) 731-743.

DOI: 10.1260/136943309789867890

[26] D. Oliveira, I. Basilio, P. Lourenço, Experimental Bond Behavior of FRP Sheets Glued on Brick Masonry, J Compos Constr 15/1 (2011) 32-41.

DOI: 10.1061/(asce)cc.1943-5614.0000147

[27] M. Panizza, E. Garbin, M.R. Valluzzi, C. Modena, Experimental investigation on bond of FRP/SRP applied to masonry prisms, Proc. 6th Int. Conf. on FRP Composites in Civil Engineering - CICE 2012, Rome (Italy), June 13-15 (2012).

DOI: 10.4028/www.scientific.net/kem.624.453

[28] CNR DT-200, Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Existing Structures, Italian National Research Council (2004).

[29] ACI 440. 7R-10, Guide for the Design and Construction of Externally Bonded Fiber-Reinforced Polymer Systems for Strengthening Unreinforced Masonry Structures, American Concrete Institute (2010).

DOI: 10.14359/51663675

[30] M. Panizza, E. Garbin, M.R. Valluzzi, C. Modena, Experimental comparison of various types of specimens subjected to SL and DL shear bond tests on EB composites applied to bricks, Proc. 6th Int. Conf. on FRP Composites in Civil Engineering - CICE 2012, Rome (Italy), June 13-15 (2012).

[31] M. Panizza, E. Garbin, M.R. Valluzzi, C. Modena, Caratterizzazione dell'aderenza di materiali compositi per il rinforzo di strutture in muratura, Proc. Congreso Latinoamericano sobre Patología de la Construccíon, Tecnología de la Rehabilitacíon y Gestíon del Patrimonio – REHABEND 2014, Santander (Spain), April 1-4. In Italian.

[32] C. Mazzotti, M. Savoia, B. Ferracuti, A new single-shear set-up for stable debonding of FRP-concrete joints, Constr Build Mater, 23 (2009) 1529-1537.

DOI: 10.1016/j.conbuildmat.2008.04.003