PSI - Issue 64

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 64 (2024) 1508–1515

SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Shear stress transfer at the SRG-concrete interface: influence of the number of layers Salvatore Verre a , Fabrizio Comodini a , Riccardo Panico a , Alessio Cascardi b , Francesco Focacci a, * a University eCampus, 22060 Novedrate, CO, Italy b Department of Civil Engineering, University of Calabria, 87036 Arcavacata di Rende, CS, Italy Abstract Externally bonded SRG (steel reinforced grout) is a promising technique for strengthening existing RC (reinforced concrete) and masonry structures. SRG is a composite material made of high-strength steel fibers embedded in a geo polymeric (inorganic) matrix. The failure of structural members strengthened with SRG composites typically occurs due to debonding when an interfacial crack develops at the fiber-matrix interface. This paper presents the results of single-lap shear tests performed in order to study the debonding phenomenon of SRG composites bonded to a concrete substrate. Specimens with one and two textile layers were tested to assess the dependency of the debonding mechanism and bond capacity on the number of layers. The results of the single-lap-shear tests were then used to derive a local CML (cohesive material law), which describes the interaction between the concrete substrate and the SRG strips. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers Keywords: SRG; Debonding; Cohesive Materials Law 1. Introduction Externally bonded FRP (fiber reinforced polymers) composites are widely used to increase the capacity of masonry and RC (reinforced concrete) structural members. FRPs are made of fiber sheets embedded in an epoxy resin that © 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers

* Corresponding author. E-mail address: francesco.focacci@uniecampus.it

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers 10.1016/j.prostr.2024.09.403