Development Length of High-Strength Steel Rebar in Ultrahigh Performance Concrete
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 8
Abstract
Ultrahigh performance concrete (UHPC) is increasingly making its way into the construction field. Characterization of UHPC has therefore received much-needed attention in the research arena. One effective application of UHPC is in combination with high-strength steel (HSS) reinforcing rebar in shallow beams or slabs. However, bond and development characteristics of HSS rebar in UHPC have not yet been investigated. This paper presents the experimental results of the pullout and flexure tests conducted with HSS rebar in UHPC. This work was a part of a larger project to develop a new light-weight UHPC-HSS bridge deck system for a moveable bridge. Because the bridge deck was designed with #10 and #22 rebar as the main reinforcement, only these two rebar sizes were used in the experiments. First, pullout specimens were tested with three different embedment lengths of 8, 10, and 12 times the rebar diameter. Then, from the results of pullout specimens, beam specimens were tested with embedment lengths of 10, 12, 14, and 48 times the rebar diameter for #10 rebar and 14, 16, 18, and 21 times the rebar diameter for #22 rebar. The size of the T-section beam specimens was derived from the size of the rib in the proposed deck system to simulate the actual conditions. The study showed that #10 and #22 rebar develop at embedment lengths of 12 and 18 times the rebar diameter, respectively. The paper also presents a comparison between experimental results and the development length recommendations of ACI 318-08, ACI 408R-03, and AASHTO, demonstrating that the ACI 408R-03 compares more favorably with the test data.
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Acknowledgments
This study was sponsored by the Florida Department of Transportation (FDOT) under Contract No. BDK80 977-06, with Mr. Marcus Ansley as Project Manager, until he sadly and unexpectedly passed away in summer 2010, after which Mr. Sam Fallaha has served as Project Manager. The support of Lafarge North America for providing its UHPC (Ductal), and MMFX Technologies of Irvine, CA, for providing its HSS bars are acknowledged. All experiments were conducted at the Titan America Structures and Construction Testing Laboratory of the Florida International University. The polystyrene foam formwork was prepared at the University of Central Florida. The first author would also like to acknowledge Florida International University Graduate School for providing Dissertation Year Fellowship to support the last year of his doctoral work. The views and findings reported here are those of the writers alone, and not necessarily the views of sponsoring agencies.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 8 • August 2013
Pages: 991 - 998
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Nov 26, 2011
Accepted: Jul 24, 2012
Published online: Aug 27, 2012
Discussion open until: Jan 27, 2013
Published in print: Aug 1, 2013
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