Polymer textiles as a retrofit material for masonry walls

Abstract

The in-plane shear behaviour of unreinforced masonry wallettes retrofitted using polymer textile reinforced mortar was investigated. In particular, the effectiveness of the retrofit technique to restrain the diagonal cracking failure mode was studied. A total of 12 two-leaf thick clay brick masonry wallettes, each being 1·2 m square in size, were structurally tested in induced diagonal shear. Of these, two wallettes were tested as-built and ten were tested after being retrofitted using different commercially available textile reinforced mortar systems. Several parameters pertaining to the in-plane shear behaviour of retrofitted masonry walls were investigated, including failure modes, stress–strain behaviour, shear strength, maximum drift, pseudo-ductility and shear modulus. It was inferred from the results that the observed diagonal shear strength increase for test wallettes having textile reinforced mortar on one face ranged between 114% and 148%, whereas the test wallettes having textile reinforced mortar on both faces failed in a brittle manner, exhibiting a shear strength of between 446 and 481% of their as-built strength.iffness and energy dissipation capacity of the frame increased significantly.

Experimental and numerical assessment of the shear behaviour of lime mortar clay brick masonry triplets

“…Strengthening by reinforced coatings requires a reinforcing material, typically in the form of a mesh, and an overlay in the form of mortar, plaster or shotcrete. Reinforcement materials can include a bi-directional expanded wire mesh [30,31], orthogonal meshes with hot-rolled ribbed wires [32], and polymeric or fibre reinforced polymer meshes. Reinforced coatings can include relatively flexible fibre materials such as carbon, glass, basalt [20,[32][33][34], polypropylene, or polyester [15,33,35,36], as well as relatively stiff biaxial orthogonal geogrids [37], or triangular monolithic polymer grids [38].…”

Effectiveness of plasters and textile reinforced mortars for strengthening clay masonry infill walls subjected to combined in‐plane/out‐of‐plane actions / Wirksamkeit von Putz und textilbewehrtem Mörtel bei der Verstärkung von Ausfachungswänden aus Ziegelmauerwerk, die kombinierter Scheiben‐ und Plattenbeanspruchung ausgesetzt sind

“…Für diese Anwendungen wurden später verstärkende Matten, eingebettet in eine oder mehrere Putzschichten (d. h. Anbringen mit Hilfe einer anorganischen Matrix auf der Basis von Zement-und/oder Kalkbindern), entwickelt [7], [8], [9].…”

“…For these applications, strengthening meshes, embedded in one or more layers of plaster (i.e., applied through an inorganic matrix based on cement and/or lime binders), were later developed [7], [8], [9].…”

Typical brick masonry walls reinforced with high-strength mortar and steel bars in the horizontal joints

“…At present, there are two ways to strengthen masonry structures: (1) Reinforce the outer surface of masonry load-bearing walls, such as using engineered cementations composite, fiber reinforced mortars (PP-FRM), carbon fiber reinforced polymer (CFRP), and other materials to reinforce the masonry walls (Bernat-Masoa et al, 2015; Ismail and Ingham, 2013; Ismail et al, 2011; Lin et al, 2014; Papanicolaou et al, 2007; Yavuz Yardin, 2016). (1) Strengthening the mortar joints of masonry structure can improve the seismic performance of the structure (Ismail and Ingham, 2016; Messali, 2017; Saleem, 2016; Triller, 2019).…”