Bond Characteristics between High-Strength Bars and Ultrahigh-Performance Concrete
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 1
Abstract
A series of pullout tests were conducted to investigate the bond characteristics of deformed high-strength steel bars embedded in ultrahigh-performance concrete (UHPC). This study considered different fiber volume contents, bar diameters, bar embedment lengths, concrete covers, and bar grades. Pullout force, slip at the free end of the bar, and crack patterns were measured, and bond failure modes were investigated. New results are reported regarding bond strength increase with fiber volume content (up to 3%), bar diameter, and bar grade. The thickness of the concrete cover significantly affected the bond failure mode. UHPC had considerable energy absorption capacity due to debonding and pullout of steel fibers from the matrix. A theoretical formula and a simplified formula to evaluate the splitting bond strength are proposed, which are consistent with the experimental results.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the submitted article.
Acknowledgments
This research was sponsored by the National Research Foundation of China (NRF) and a grant from the Chinese government (No. 51278402). The authors would like to express their gratitude for the support. The opinions expressed in this paper are those of the authors and do not necessarily reflect those of the sponsors.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 1 • January 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jul 19, 2018
Accepted: May 29, 2019
Published online: Oct 24, 2019
Published in print: Jan 1, 2020
Discussion open until: Mar 24, 2020
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