Nonlinear numerical simulation and experimental verification of bondline strength of CFRP strips embedded in concrete for NSM strengthening applications

This article presents results of an investigation that focuses on assessing bondline strength of carbon/epoxy fiber reinforced polymeric (CFRP) precured strips embedded in concrete for near‐surface‐mounting (NSM) strengthening applications. In this study, experimental evaluation and nonlinear numeri...

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Bibliographic Details
Published in:	Structural concrete : journal of the FIB Vol. 23; no. 3; pp. 1794 - 1815
Main Authors:	Mosallam, Ayman S., Ghabban, Naif, Mirnateghi, Ehsan, Agwa, Ashraf Abdel Khalek
Format:	Journal Article
Language:	English
Published:	Weinheim WILEY‐VCH Verlag GmbH & Co. KGaA 01-06-2022 Wiley Subscription Services, Inc
Subjects:	Adhesive bonding Basalt bondline strength Carbon fiber reinforced plastics carbon/epoxy composites Failure load Fiber reinforced polymers Grooves near‐surface mounting Numerical analysis pull‐out tests Reinforced concrete repair Rupture Strengthening
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Summary:	This article presents results of an investigation that focuses on assessing bondline strength of carbon/epoxy fiber reinforced polymeric (CFRP) precured strips embedded in concrete for near‐surface‐mounting (NSM) strengthening applications. In this study, experimental evaluation and nonlinear numerical analysis of CFRP/concrete interfacial bond behavior are investigated. In this study, 15 pull‐out tests were performed on different reinforced concrete (RC) U‐shaped column specimens with different NSM groove configurations to evaluate the effect of groove size, groove depth, and adhesive bondline thickness on overall performance of the CFRP‐NSM system and to identify the optimum groove dimensions. Experimental results indicated that changing groove geometries of the NSM‐FRP reinforcements significantly affect bondline strength and associated mode of failures of NSM‐CFRP system. It was also shown that increasing bondline length lead to an increase in ultimate failure load and CFRP rupture strain. Based on results of this study, NSM materials with lower longitudinal moduli and higher rupture strains (e.g., E‐glass/epoxy or basalt/epoxy), may increase toughness and enhance performance of the NSM strengthening system.
Bibliography:	Funding information Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors’ closure, if any, approximately nine months after the print publication. California Department of Transportation, Grant/Award Number: 07A2769
ISSN:	1464-4177 1751-7648
DOI:	10.1002/suco.202100537