Grout Injection Effect on the Shear Behavior of FRCM Strengthened Stone Masonry Panels

Abstract:

During the last decades, several seismic phenomena have shown the high vulnerability of existing stone masonry structures subject to horizontal actions. Innovative composite materials, such as Fiber Reinforced Cementitious Matrix (FRCM), can be adopted for the retrofitting of masonry structures. The use of these innovative FRCM systems is usually combined with a more traditional retrofitting technique: grout injection. It allows to restore or improve the transversal connection between wall leaves, ensuring a monolithic behavior of the structural element. The objective of this research was to analyze the effect of the quality of the grout injection on the shear response of FRCM strengthened stone masonry panels. Results from an experimental campaign, where stone masonry specimens were subject to diagonal compression tests, are therefore presented in this paper. Two samples were subject to grout injection and one of them was strengthened with Steel Reinforced Grout (SRG). Comparisons between the experimental results showed that grout injection alone, if correctly executed, could determine a significant improvement in the shear capacity of masonry panels. The application of the FRCM strengthening system could further enhance the behavior of the samples, especially influencing the failure mode. Comparisons with analytical formulations for the evaluation of the capacity of strengthened walls are also presented.

• Periodical: Key Engineering Materials (Volume 817)
• Pages: 552-559
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.817.552
• Online since: August 2019
• Authors: Francesca Ferretti*, Andrea Incerti, Anna Rosa Tilocca, Claudio Mazzotti
• Keywords: Diagonal Compression Test, FRCM, Grout Injections, Masonry, Sonic Test

References

[1] C. Papanicolaou, T. Triantafillou and M. Lekka, Externally bonded grids as strengthening and seismic retrofitting materials of masonry panels, Constr. Build. Mater. 25 (2011) 504–514.

DOI: 10.1016/j.conbuildmat.2010.07.018

[2] A. Bellini, M. Bovo, C. Mazzotti, Experimental and numerical evaluation of fiber-matrix interface behaviour of different FRCM systems, Compos. Part B Eng., 161 (2019) 411-426.

DOI: 10.1016/j.compositesb.2018.12.115

[3] F. G. Carozzi, A. Bellini, T. D'Antino, G. de Felice, F. Focacci, L. Hojdys, L. Laghi, E. Lanoye, F. Micelli, M. Panizza and C. Poggi, Experimental investigation of tensile and bond properties of Carbon-FRCM composites for strengthening masonry elements, Compos. Part B Eng., 128 (2017) 110-119.

DOI: 10.1016/j.compositesb.2017.06.018

[4] M. Leone, M.A. Aiello, A. Balsamo, F.G. Carozzi, F. Ceroni, M. Corradi, M. Gams, E. Garbin, N. Gattesco, P. Krajewski, C. Mazzotti, D. Oliveira, C. Papanicolaou, G. Ranocchiai, F. Roscini and D. Saenger, Glass fabric reinforced cementitious matrix: Tensile properties and bond performance on masonry substrate, Compos. Part B Eng., 127 (2017) 196–214.

DOI: 10.1016/j.compositesb.2017.06.028

[5] A. Bellini, S. Kahangi Shahreza, C. Mazzotti, Cyclic bond behavior of FRCM composites applied on masonry substrate, Compos. Part B Eng., 169 (2019) 189-199.

DOI: 10.1016/j.compositesb.2019.04.009

[6] C. Faella, E. Martinelli, E. Nigro, S. Paciello, Shear capacity of masonry walls externally strengthened by a cement-based composite material: An experimental campaign, Constr. Build. Mater. 24 (2010) 84–93.

DOI: 10.1016/j.conbuildmat.2009.08.019

[7] L. Feo, R. Luciano, G. Misseri, L. Rovero, Irregular stone masonries: Analysis and strengthening with glass fibre reinforced composites, Compos. Part B Eng., 92 (2016) 84–93.

DOI: 10.1016/j.compositesb.2016.02.038

[8] F. Ferretti, A. Incerti, B. Ferracuti, C. Mazzotti, Diagonal compression tests on masonry panels strengthened by FRP and FRCM, in: Van Balen & Verstrynge (Eds.), Taylor & Francis Group, London, 2016, pp.1069-1076. DOI: https://doi.org/10.1201/9781315616995-144.

DOI: 10.1201/9781315616995-144

[9] F. Ferretti, A. Incerti, B. Ferracuti, C. Mazzotti, FRCM Strengthened Masonry Panels: The Role of Mechanical Anchorages and Symmetric Layouts, Key Eng. Mater. 747 (2017)334–341.

DOI: 10.4028/www.scientific.net/kem.747.334

[10] A. Incerti A., A.R. Tilocca, F. Ferretti, C. Mazzotti, Influence of Masonry Texture on the Shear Strength of FRCM Reinforced Panels, RILEM Bookseries, Springer. 18 (2019) 1623–1631.

DOI: 10.1007/978-3-319-99441-3_174

[11] A. Miltiadou-fezans, E. Vintzileou, E. Papadopoulou, A. Kalagri, Mechanical Properties of Three-Leaf Stone Masonry after Grouting, Struct. Anal. Hist. Constr., New Delhi (2006)791–798.

DOI: 10.1016/j.engstruct.2007.11.003

[12] E. Vintzileou, C. Mouzakis, C. E. Adami, L. Karapitta, Seismic behavior of three-leaf stone masonry buildings before and after interventions: Shaking table tests on a two-storey masonry model, Bull. Earthq. Eng. 13 (2015) 3107–3133.

DOI: 10.1007/s10518-015-9746-x

[13] ASTM E519-15. Standard test method for diagonal tension (shear) in masonry assemblages. American Society for Testing Material, (2015).

[14] RILEM TC - LUMB6, Diagonal tensile strength tests of small wall specimens, (1991).

DOI: 10.1201/9781482271362-309

[15] M.M. Frocht, Recent advances in photoelasticity. ASME Trans. 55 (1931) 135-153.

[16] CNR-DT 215/2018, Guide for the design, execution and control of strengthening interventions by means of fiber reinforced composite materials with inorganic matrices (in italian), National Research Council, (2018).

[17] Italian Building Code (in Italian), Ministry of Infrastructure and Transport, D.M. 17 January (2018).

[18] Italian Building Code Commentary (in italian), Ministry of Infrastructure and Transport, D.M. 21 January (2019).