Determination of the interfacial cohesive material law for SRG composites bonded to a masonry substrate

Santandrea, Mattia; Focacci, Francesco; Mazzotti, Claudio; Ubertini, Francesco; Carloni, Christian

doi:10.1016/j.engfailanal.2019.104322

Cited by 30 publications

(28 citation statements)

References 49 publications

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“…E b was evaluated on the stress-versus-strain curve obtained as the slope between 5% and 30% of the peak stress. The average elastic modulus E b obtained was 7.3 GPa (CoV = 0.29) [35]. The fracture energy of bricks (G F ) was evaluated by performing three-point bending tests on three notched bricks, as the area under the load-displacement curve divided by the area of the ligament [36][37][38].…”

Section: Methodsmentioning

confidence: 99%

“…The compressive strength of mortar joints was evaluated from the compressive strength obtained from the double punch test on fourteen specimens, and the average was equal to 15.9 MPa [35,40]. The SRG composite system used to strengthen the masonry blocks comprised high-strength galvanized steel fibers (cords) embedded in an inorganic mortar matrix.…”

Section: Methodsmentioning

confidence: 99%

“…The flexural strength, compressive strengths, and fracture energy, evaluated with the same methods employed for the lime-based mortar, were equal to 7.6 MPa (CoV = 0.09), 46.4 MPa (CoV = 0.03), and 101.0 N/m (CoV = 0.22), respectively. It should be noted that for both mortars, several batches were used to cast the single-lap direct shear test specimens [35,43]. Therefore, from each batch, three specimens were cast to determine the mechanical properties reported above.…”

Section: Methodsmentioning

confidence: 99%

“…Before applying the composite, all the masonry blocks were left to soak in a bucket filled with water for at least 20 min ( Figure 2). This procedure was necessary to avoid water absorption by the masonry surfaces during the application of the SRG composite should be noted that for both mortars, several batches were used to cast the single-lap direct shear test specimens [35,43]. Therefore, from each batch, three specimens were cast to determine the mechanical properties reported above.…”

Section: Specimen Preparation and Application Of Srg Reinforcementmentioning

confidence: 99%

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Some Key Aspects in the Mechanics of Stress Transfer Between SRG and Masonry

2020

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The use of composite materials to strengthen masonry structures has become common practice within the civil engineering community. Steel-reinforced grout (SRG), which comprises high-strength steel fibers embedded in a mortar matrix, is part of the family of the fiber-reinforced cementitious matrix (FRCM) composites that represent a suitable alternative to fiber-reinforced polymer (FRP) composites for strengthening existing structures. Although studies on FRCMs have already reached a certain level of maturity, some key issues remain open, such as the role of matrix type and layout, substrate properties, and test rate. This paper focuses on some of these issues. The results of single-lap direct shear tests on masonry blocks strengthened with SRGs are presented to analyze the bond behavior between the composite material and the substrate. Four aspects are considered: (1) the change in the width of the SRG mortar matrix while keeping the width of the fiber sheet fixed; (2) the type of mortar used for the SRG; (3) the influence of the test rate, and (4) the type of substrate (i.e., concrete vs. masonry). The results obtained indicate the active role of the matrix layout and the importance of the test rate, encouraging further investigations to clarify these aspects.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Specimen Preparation and Application Of Srg Reinforcementmentioning

confidence: 99%

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Some Key Aspects in the Mechanics of Stress Transfer Between SRG and Masonry

2020

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“…In the case of a cement matrix, three forms of debonding failure are possible: debonding at the matrix-masonry interface, interlaminar failure at the matrix-fiber interface, and rupture of the steel wires. The most common is interlaminar failure [30]. According to Razavizadeh et al [31], the surface preparation is the first factor determining the failure mode.…”

Section: Bond Behaviormentioning

confidence: 99%

Steel-Reinforced Polymers and Steel-Reinforced Composite Mortars for Structural Applications—An Overview

Krzywoń

2020

J. Compos. Sci.

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Bonding of external reinforcement is currently the simplest, fastest, and most popular method of strengthening concrete and masonry structures. Glass and carbon organic fibers are the dominant materials used, but alternatives also include high-strength steel wires. The mechanical properties of such steel are comparable to those of carbon fiber. Due to their good compatibility with mortars, steel wires are particularly well suited to the revitalization of historic buildings. The manuscript provides an overview of research and experience in the use of steel-reinforced polymers (SRPs) and steel-reinforced composite mortars (SRCMs, also called steel-reinforced grout (SRG)) for structural strengthening. The examples described are for concrete beams, slabs and columns, walls, and masonry arches. The results of laboratory tests are discussed. The summary presents the advantages and disadvantages of composites based on ultra-high-strength steels compared with more popular carbon fiber composites.

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Strengthening of reinforced concrete beams in shear using different steel reinforced grout techniques

Wakjira

Ebead

2020

Structural Concrete

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In this study, steel reinforced grout (SRG) is proposed for shear strengthening of reinforced concrete (RC) beams using the near-surface embedded (NSE) technique. It is believed based on several research contributions in the literature that the NSE technique precludes or delays the onset of premature debonding and achieves higher strength increase in strengthened beams compared to the externally bonded (EB) counterpart. The tests conducted in this study used 13 RC beams to determine the shear behavior of RC beams strengthened in shear using SRG. The effect of the strengthening technique (NSE versus EB), SRG fabric density, strengthening scheme (side-bonded vs. U-wrapped), and the strengthening configuration (continuous vs. discontinuous) on RC shear enhancement was studied. The strengthening effectiveness of the SRG system was assessed in terms of the shear capacity, failure mechanism, load-deflection response, and strain results.The NSE-SRG increased the beam shear strength by an average of 100%, alleviated SRG debonding, and enhanced the deformation characteristics. The average increase in the shear strength of the EB-SRG strengthened beam was 54% and 105% for the continuous and discontinuous SRG strips, respectively. An analytical model is proposed to predict the shear capacity of both the NSE-SRG and EB-SRG strengthened beams and give accurate and safe predictions.

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Determination of the interfacial cohesive material law for SRG composites bonded to a masonry substrate

Cited by 30 publications

References 49 publications

Some Key Aspects in the Mechanics of Stress Transfer Between SRG and Masonry

Some Key Aspects in the Mechanics of Stress Transfer Between SRG and Masonry

Steel-Reinforced Polymers and Steel-Reinforced Composite Mortars for Structural Applications—An Overview

Strengthening of reinforced concrete beams in shear using different steel reinforced grout techniques

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