Durability Assessment of 15- to 20-Year-Old GFRP Bars Extracted from Bridges in the US. II: GFRP Bar Assessment
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Volume 25, Issue 2
Abstract
A multilaboratory investigation into the durability of glass fiber–reinforced polymer (GFRP) bars extracted from eleven 15- to 20-year-old bridges in the US will be performed. Part 1 (Benzecry et al., forthcoming) of this two-paper series describes the bridges and presents data on the condition of their concrete, and Part 2 focuses on the condition of the bars. Constituent content, maximum water absorption, as-received moisture content, glass transition temperature (Tg), short bar shear (SBS) strength, and tensile strength will be evaluated. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) will be performed. The fiber mass content of all bars was close to or greater than that specified in the current ASTM E1309 (ASTM 2011a) GFRP bar standard. SEM and EDS showed only slight signs of degradation, which was predominantly near the outer radius of the bars. The loss of SBS strength was slight to moderate in bars with control data for comparison. Tensile strength, which could only be evaluated in 1 bridge, showed a reduction of only 4.2% after 17 years of service. It was concluded that GFRP bars could be considered a promising replacement for steel reinforcement in bridge decks subjected to real-time field exposure.
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Acknowledgments
The authors gratefully acknowledge support from the American Concrete Institute's Strategic Development Council the ReCAST Tier 1 University Transportation Center at the Missouri University of Science and Technology, The United States Department of Education GAANN Program, and NSF I/UCRC CICI (Grant # NSF-1916342). Deeply appreciated is the technical assistance from staff at Owens Corning (Mr. Ryan Koch and Mrs. Mala Nagarajan), University of Miami (Ms. Janna Brown and Mr. Jorge Alvarez), Missouri S&T (Dr. Clarissa Wisner and Mr. Eric Bohannan), and Pennsylvania State University (Mr. Jeffrey Kim and Mr. Jinhoo Kim. The opinions expressed in this material are those of the authors and do not necessarily reflect the views of sponsoring agencies.
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Journal of Composites for Construction
Volume 25 • Issue 2 • April 2021
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© 2021 American Society of Civil Engineers.
History
Received: Jun 16, 2020
Accepted: Nov 12, 2020
Published online: Jan 23, 2021
Published in print: Apr 1, 2021
Discussion open until: Jun 23, 2021
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