Abstract
In the paper, the bond between a composite strengthening system consisting of steel textiles embedded into an inorganic matrix (steel reinforced grout, SRG) and the concrete substrate, is investigated. An experimental investigation was carried out on medium density SRG specimens; direct shear tests were conducted on 20 specimens to analyze the effect of the bond length, and the age of the composite strip on the SRG-to-concrete bond behavior. In particular, the tests were conducted considering five bond length (100, 200, 250, 330, and 450 mm), and the composite strip’s age 14th, 21st, and 28th day after the bonding. Test results in the form of peak load, failure modes and, bond-slip diagrams were presented and discussed. A finite element model developed through commercial software to replicate the behavior of SRG strips, is also proposed. The effectiveness of the proposed numerical model was validated by the comparison between its predictions and experimental results.
Highlights
Steel reinforced grout (SRG) composites made by steel textiles embedded into inorganic mortar are commonly used to strengthen existing reinforced concrete and masonry structures
The main results of this investigation evidenced that the SRG-to-masonry bond behavior depends on the strength of the steel textile, the cord-to-mortar bond interlocking, the mechanical properties of the mortar, the manufacturing and the curing conditions of the masonry substrates
The main results of the tests evidenced that: (i) the failures occurred due to sliding phenomena and cohesive failures in the matrix irrespective of the concrete strength and surface finishes; (ii) the bonded effective length ranges between 200 mm and 300 mm both for low density and medium density steel fibers; and (iii) increasing the number of the steel strips the maximum load resisted by the specimens increased but the average tensile strength of the SRG decreased
Summary
Steel reinforced grout (SRG) composites made by steel textiles embedded into inorganic mortar (cement based or lime mortar) are commonly used to strengthen existing reinforced concrete and masonry structures. The main results of this investigation evidenced that the SRG-to-masonry bond behavior depends on the strength of the steel textile, the cord-to-mortar bond interlocking, the mechanical properties of the mortar, the manufacturing and the curing conditions of the masonry substrates. The main results of the tests evidenced that: (i) the failures occurred due to sliding phenomena and cohesive failures in the matrix irrespective of the concrete strength and surface finishes; (ii) the bonded effective length ranges between 200 mm and 300 mm both for low density and medium density steel fibers; and (iii) increasing the number of the steel strips the maximum load resisted by the specimens increased but the average tensile strength of the SRG decreased (i.e., the exploitation ratio decreased). To validate the accuracy of the proposed numerical model, its predictions were compared with both the experimental results obtained in this study and some others available in literature
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