Evaluation of Microsilica and Nanosilica on Bond Properties between Moderate–High Strength Concrete and Plain–Ribbed Steel Rebar
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 2
Abstract
Individual and synergistic effects of microsilica (MS) and nanosilica (NS) on the bond properties between moderate–high strength concrete and plain–ribbed steel rebar were investigated. Two different concrete series with water–cementitious material ratio () of 0.55 and 0.36 were studied. Pull-out tests were performed to analyze the bond strength and bond-slip behavior. Compressive strength, splitting tensile strength, and elastic modulus of the samples were also reported. Results have revealed that although the compressive strength showed a considerable increase after adding MS and/or NS, the modulus of elasticity and splitting tensile strength were not affected considerably. With the addition of MS and/or NS, while an increment was seen in the bond strength for the plain rebar, no significant effect was observed for the ribbed one. In addition, despite residual bond strengths showing an increase in the plain rebar, a reduction was seen for the ribbed one. In terms of slip energy, the use of MS and/or NS for plain rebar made a positive contribution, i.e., the slip energies for both concrete strength groups increased. On the other hand, for the ribbed rebar case, slip energy was negatively affected for the concrete with of 0.55, while no significant trend was observed for the group. Based on the bond-slip data obtained, new prediction models were proposed to estimate bond strength and bond-slip behavior for both rebar types. These are compared with other models available in the literature. For the ribbed rebar, the slip amount, where the plateau region on the bond stress versus slip curves begins, was significantly lower than the assumptions considered in the other models. Considering the descending parts of bond stress versus slip relations, the residual bond stress can be maintained more efficiently in plain compared to ribbed rebar.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors gratefully acknowledge “Ravago Chemicals Turkey” for providing colloidal nano-silica samples and “ITU Scientific Research Projects Coordination Unit (BAP)” for their support (Project No. MYL-2021-43058).
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Journal of Materials in Civil Engineering
Volume 36 • Issue 2 • February 2024
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Sep 29, 2022
Accepted: Jul 14, 2023
Published online: Nov 21, 2023
Published in print: Feb 1, 2024
Discussion open until: Apr 21, 2024
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