Concrete Bond and Behavior of Nonproprietary Ultrahigh-Performance Concrete Bridge Slab Joints
Publication: Journal of Bridge Engineering
Volume 26, Issue 2
Abstract
The purpose of this study was to evaluate a nonproprietary ultrahigh-performance concrete (UHPC) mix design in terms of bond strength and behavior as a slab joint material. Composite modulus of rupture and direct pull-off tests were conducted to evaluate bond strength using sandblasted, wire-brushed, and exposed aggregate substrates. The two methods for obtaining a saturated substrate included covering the substrate with wet burlap or power washing the substrate and either leaving pooled water or patting the surface dry. In addition, several specimens were constructed by joining two full-scale normal strength concrete slabs with a UHPC joint containing shortened reinforcing bar embedment lengths. These specimens were used to evaluate structural behavior when subjected to both static and cyclic loadings. Each test was compared to an identical test using the proprietary UHPC product Ductal. Bond testing showed that power washing of the substrate was required to produce comparable bond strengths to Ductal. For full-scale slabs, the nonproprietary mix performed comparably to Ductal as a bridge joint material, despite having lower compressive strength.
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Acknowledgments
The authors thank the Oklahoma Department of Transportation for their generous support. Furthermore, the authors thank the following companies for donating time and materials needed to conduct this research: Dolese Bros Co., LafargeHolcim, and Norchem. This work was supported by the Oklahoma Department of Transportation through the State Planning and Research Program project SPR 2276.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 26 • Issue 2 • February 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Nov 2, 2019
Accepted: Sep 16, 2020
Published online: Dec 10, 2020
Published in print: Feb 1, 2021
Discussion open until: May 10, 2021
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