Mechanical Characterization of Steel-Reinforced Grout for Strengthening of Existing Masonry and Concrete Structures

Mazzuca, S.; Hadad, Houman Akbari; Ombres, Luciano; Nanni, Antonio

doi:10.1061/(asce)mt.1943-5533.0002669

Cited by 16 publications

(15 citation statements)

References 13 publications

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“…The density, width, and bond length of steel fiber textiles had a significant impact on the reinforcement effect of the STRM composite material reinforcement technology. Mazzuca 12 and Mandor and Refai 16 fiber textiles are widely used in the field of building reinforcement.…”

Section: ■ Introductionmentioning

confidence: 99%

Interface Bonding Properties and Mechanism of Steel Fiber and Hot Melt Adhesive via Interface Design Engineering

Zhang,

Liu,

Zhang

et al. 2024

Langmuir

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Steel fiber textile, which is composed of steel fibers and glass fibers, has a support layer impregnated with hot melt adhesive (HMA). During long-term service, the bonding force between the steel fiber/HMA system interfaces is poor. In order to improve the bond strength and durability of the interface, this paper introduced sandblasting, acid-etching, and phosphating treatments on the surface of the steel fibers. Also, the effects of these three pretreatment methods on the bond strength of the steel fiber/HMA interface were investigated. The results indicate that the interfacial bond strength of composites made from steel fibers is improved via surface treatment. Under a hydrothermal and simulated concrete pore solution environment, the durability of the steel fiber/HMA interface after sandblasting and acid-etching pretreatment is not as good as that after phosphating pretreatment. The mechanical properties of the phosphating/HMA composite were maintained at 4.56 and 2.24 times compared to those of the untreated/HMA composite, respectively. This is because the pinning effect formed by the phosphating film on the surface of steel fibers at the interface of steel fiber/HMA can serve as a physical barrier against corrosion, preventing the invasion of chloride ions and water vapor and improving the durability of the interface.

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Section: ■ Introductionmentioning

confidence: 99%

Interface Bonding Properties and Mechanism of Steel Fiber and Hot Melt Adhesive via Interface Design Engineering

Zhang,

Liu,

Zhang

et al. 2024

Langmuir

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“…Several studies were conducted to investigate the performances of reinforced concrete structures strengthened in flexure with SRG; the obtained results available in the technical literature evidenced significant improvements in both strength and ductility of the strengthened elements [1][2][3][4][5][6]. The available results of research, both experimental and theoretical, devoted to the analysis of the bond of SRG to concrete and SRG to masonry joints are also numerous [7,8]. On the contrary, the results related to the analysis of the performances of reinforced concrete beams strengthened in shear with SRG strips are still limited.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Strengthening Configuration on the Shear Capacity of Reinforced Concrete Beams Strengthened with SRG (Steel-Reinforced Grout) Composites

Ombres

Verre

2022

Fibers

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In this paper, the influence of the strengthening configuration on the structural response of U-wrapped SRG (Steel-Reinforced Grout) shear-strengthened reinforced concrete beams was analyzed both experimentally and theoretically. The parameters varied were the ratio sf/wf, sf being the distance between two consecutive U-shaped strips and wf the width of the strips, and the number of steel fabric layers (one and two). Two series of real-scale beams, eleven beams in total with one un-strengthened and ten strengthened, were tested up to failure (the results obtained in the first series of tests were reported in a previously published paper). The obtained results highlighted that the debonding phenomena, which occurred for all the examined strengthening configurations, strongly affected the shear capacity of strengthened beams. An analytical model found based on the “effective strain” of the SRG strips was developed to predict the shear capacity of SRG shear-strengthened reinforced concrete beams. Two analytical relationships were proposed to evaluate the “effective strain” of the SRG strips: The first one was based on a statistical analysis of results obtained by tests on FRCM (Fabric-Reinforced Cementitious Mortar) and SRG shear-strengthened reinforced concrete beams, while the second was developed through the results of single lap direct shear tests performed on SRG-to-concrete joints. The effectiveness of the proposed analytical methods was evaluated through the comparison of their predictions and available experimental results.

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“…Recently, composites that utilize high strength steel fabrics have been proposed as cost-effective and promising alternative strengthening solutions. [22][23][24][25][26][27][28] Steel fabrics comprise unidirectional ultra-high tensile strength (UHTS) galvanized steel micro-cords. Such materials can be applied to structural members through the wet lay-up method using either polymeric resin in steel reinforced polymer (SRP) or inorganic matrix in steel reinforced grout (SRG).…”

Section: Introductionmentioning

confidence: 99%

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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Mechanical Characterization of Steel-Reinforced Grout for Strengthening of Existing Masonry and Concrete Structures

Cited by 16 publications

References 13 publications

Interface Bonding Properties and Mechanism of Steel Fiber and Hot Melt Adhesive via Interface Design Engineering

Interface Bonding Properties and Mechanism of Steel Fiber and Hot Melt Adhesive via Interface Design Engineering

Influence of the Strengthening Configuration on the Shear Capacity of Reinforced Concrete Beams Strengthened with SRG (Steel-Reinforced Grout) Composites

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

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