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.
Highlights
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 basic determination of de-bonding mechanism along the interface of cementitious bi-material cast at different times requires appropriate investigation and evaluation of intrinsically induced stresses associated with inherent material asymmetry and composite dimensional incompatibility (Birkeland, 1960; Morgan, 1996; Silfwerbrand, 1997)
This paper investigates via laboratory based experiments and finite element analysis technique the significant evolution of interfacial de-bonding failure associated with intrinsic loadings and material asymmetry between two bonded concrete materials
Summary
The basic determination of de-bonding mechanism along the interface of cementitious bi-material cast at different times requires appropriate investigation and evaluation of intrinsically induced stresses associated with inherent material asymmetry and composite dimensional incompatibility (Birkeland, 1960; Morgan, 1996; Silfwerbrand, 1997). Several analytical techniques exist on how to estimate the resulting mixed-mode de-bonding parameters; the underpinning generic approach relies on expanding the conjugate variables of the de-bonding failure parameters in the normal and tangential planes (Turon et al, 2007; Olubanwo et al, 2017). Both effective traction vector and its corresponding displacement are formulated for de-bonding initiation and propagation. Distinct 2D plane strain numerical cases involving variable structural scale, creep coefficient and crack-tip phase-angle effects were considered within the context of zero-thickness Interface Contact Analysis (ICA)
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