Effect of Reinforcement Ratio on Transverse Early-Age Cracking of GFRP-RC Bridge Deck Slabs
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Volume 18, Issue 6
Abstract
Because concrete bridge deck slabs are much longer in the traffic direction, they experience transverse early-age cracks due to volumetric instability and restraint. In the last decade, the use of the noncorrodible fiber-reinforced polymer (FRP) bars in concrete bridges has significantly increased. This paper presents the experimental results of four full-scale, cast-in-place glass FRP–reinforced concrete (GFRP-RC) deck slabs, subjected to early-age shrinkage. The slabs measured . The longitudinal reinforcement ratio (0.30, 0.50, 0.70, and 1.1%) was the main parameter investigated in this study. The test results were presented in terms of cracking pattern, width and spacing, strains in both GFRP bars, and concrete over a period of 90 days after casting. The experimental results were compared with provisions and predictions from a published analytical model. It was concluded that the published numbers can reliably provide a minimum reinforcement ratio for bridge deck slabs reinforced with GFRP bars. Also, the measured width of shrinkage cracks agreed with the results of the analytical model.
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Acknowledgments
The authors wish to express their gratitude and sincere appreciation to the Network of Centers of Excellence on Intelligent Sensing for Innovative Structures (ISIS-Canada) and the Natural Science and Engineering Research Council of Canada (NSERC) through Canada Research Chairs Program for financing this research work. The technical support received from the technical staff in the McQuade Structures Laboratory at the University of Manitoba is greatly acknowledged.
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Journal of Composites for Construction
Volume 18 • Issue 6 • December 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Oct 26, 2013
Accepted: Feb 5, 2014
Published online: Mar 12, 2014
Discussion open until: Aug 12, 2014
Published in print: Dec 1, 2014
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