Improvement in Bond Strength of Steel Bar in Geopolymer Concrete by Adding Graphene Nanoplatelets
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 6
Abstract
The bond strength of steel reinforcement bars in concrete is of prime importance for the strength and serviceability of reinforced concrete structures. The composition of concrete directly affects the bond strength of steel bars in concrete. Research is ongoing to improve the bond properties of concrete with the addition of nanoparticles. In this paper, the effect of adding graphene nanoplatelets (GNP) to geopolymer concrete on the bond strength of steel bars in geopolymer concrete was investigated and compared with the bond strength of steel bars in ordinary portland cement (OPC) concrete. Slag and fly ash were used as aluminosilicate precursors, and ambient curing conditions were adopted for preparing geopolymer concrete. Specimens were cast with geopolymer concrete without and with GNP and OPC concrete without and with GNP. Steel bars of four different diameters (10, 12, 16, and 20 mm) were used for preparing the specimens. The quantity of GNP added in the concrete was 0.5% by weight of aluminosilicate materials in geopolymer concrete and 0.5% by weight of cement in OPC concrete. The addition of GNP to geopolymer concrete enhanced the bond strength by 13%–19% for the steel bars of diameters 10–20 mm. The bond strengths of steel bars in geopolymer concrete were found to be lower than the bond strength of steel bars in OPC concrete. Furthermore, the bond strengths were calculated using equations available in the design codes and available research studies on geopolymer and OPC concrete and compared with the experimental bond strengths.
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Data Availability Statement
The data (including tables and figures) that support the findings of this study are available from the corresponding author upon a reasonable request.
Acknowledgments
The authors thank the technical staff of High-Bay Laboratory at the University of Wollongong, Australia, especially Mr. Gavin Bishop and Mr. Travis Marshall. The authors are also thankful to the ASMS Pty Ltd., Eraring Power Station, Australia, and the Australian (Iron and Steel) Slag Association, Australia, for providing GGBFS and FA. In addition, the authors would like to thank BASF Australia for providing a high-range water reducer admixture. Further, the first author would like to acknowledge the financial support for the Ph.D. scholarship received from the University of Wollongong, Australia, and the Higher Education Commission, Pakistan.
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 6 • June 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Dec 26, 2021
Accepted: Sep 27, 2022
Published online: Mar 23, 2023
Published in print: Jun 1, 2023
Discussion open until: Aug 23, 2023
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