Experimental and Numerical Investigation on the Steel Reinforced Grout (SRG) Composite-to-Concrete Bond

• Published in: Journal of composites science Vol. 4; no. 4; p. 182
• Main Authors: Ombres, Luciano, Verre, Salvatore
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.12.2020
• Subjects: bond; Cement; Concrete; direct shear test; Failure; Failure modes; Finite element method; finite element model; Grout; Interfaces; Masonry; Mathematical models; Mechanical properties; Numerical analysis; Numerical models; Peak load; Reinforced concrete; Reinforcing steels; Shear tests; SRG; Strip; Substrates; Tensile strength; Textiles
• ISSN: 2504-477X; 2504-477X
• DOI: 10.3390/jcs4040182

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.