Investigation of intrinsic de-bonding in bonded concrete overlays: Material characterisation and numerical study

Olubanwo, Adegoke Omotayo; Karadelis, John Nicolas; Saidani, Messaoud; Khorami, Morteza; Abbey, Samuel Jonah

Abstract

© 2018 Growing Science Ltd. All rights reserved. This study investigates the evolution of intrinsic interfacial de-bonding of Roller Compacted Steel Fibre Reinforced Polymer Modified Concrete (RC-SFR-PMC) bonded on substrate Ordinary Portland Cement Concrete (OPCC), using both experimental and numerical techniques. The relative effects of evolving material inhomogeneity and composite dimensional stability during curing was studied as a function of overlay structural scale, using a 2D plane strain Interface Cohesive Zone Model (ICZM). The effects of creep coefficient on interface restraint capacity and ensuing cohesive zone length were clearly evaluated. The results showed that the applied curvature due to the measured shrinkage strain was inadequate to cause critical de-bonding. In the FEA results, while the rate of interface energy release generally varies as a function of the bi-material relative stiffness and overlay structural scale, it is also evident that the two variables lose effects as the overlay structural scale approaches 0.50. The overall indicative trend shows that the rate of energy release in compliant overlay when relative stiffness (α0. Therefore, a more compliant overlay typically exhibits less relative restraint to bending induced de-bonding.

• Journal Article Type: Article
• Acceptance Date: Jan 15, 2018
• Online Publication Date: Jan 15, 2018
• Publication Date: Jan 1, 2018
• Deposit Date: May 3, 2019
• Publicly Available Date: May 3, 2019
• Journal: Engineering Solid Mechanics
• Print ISSN: 2291-8744
• Electronic ISSN: 2291-8752
• Peer Reviewed: Peer Reviewed
• Volume: 6
• Issue: 2
• Pages: 155-174
• DOI: https://doi.org/10.5267/j.esm.2018.1.003
• Keywords: intrinsic, de-bonding, composite, overlay, FEA, restraint
• Public URL: https://uwe-repository.worktribe.com/output/872159
• Publisher URL: http://doi.org/10.5267/j.esm.2018.1.003
• Contract Date: May 3, 2019