Experimental Fatigue Assessment of CFRP-Retrofitted Reinforced Concrete Beams Subjected to Service Temperatures

The use of Carbon Fiber Reinforced Polymers (CFRP) for the repair of civil infrastructure has been on the rise. Most studies have focused on the effect of CFRP to increase the stiffness and strength of reinforced concrete beams or columns. Limited attention has been given to the effect of CFRP on mitigating fatigue crack growth in steel reinforcement. Understanding how CFRP affects fatigue crack growth in rebar is important for predicting the impact of CFRP repairs on service life extension. This paper presents the results of an experimental study on the effect of externally bonded CFRP on slowing or arresting fatigue crack growth in the steel rebar in a reinforced concrete beam subjected to cyclic loading and service temperature. Localized debonding of the CFRP was observed and is attributed to the application of service temperature. Despite the development of localized debonding, the fatigue life was extended overall in specimens repaired with CFRP systems and subjected to service temperatures in comparison to those only repaired with CFRP. Crack growth rates were used to determine material constants for the Paris Law, which describes growth of a stable fatigue crack.

• Record URL:
  https://www.ugpti.org/resources/reports/details.php?id=949
• Record URL:
  https://rosap.ntl.bts.gov/view/dot/44228
• Summary URL:
  https://rosap.ntl.bts.gov/view/dot/68386
• Supplemental Notes:
  • This document was sponsored by the U.S. Department of Transportation, University Transportation Centers Program.
• Corporate Authors:

  Colorado State University, Fort Collins

  Department of Civil and Environmental Engineering
  Fort Collins, CO  United States  80525

  Mountain-Plains Consortium

  North Dakota State University
  Fargo, ND  United States  58108

  Office of the Assistant Secretary for Research and Technology

  University Transportation Centers Program
  Department of Transportation
  Washington, DC  United States  20590
• Authors:
  • Mahmoud, Hussam
  • Memari, Mehrdad
  • Atadero, Rebecca
• Publication Date: 2018-8

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Photos; References; Tables;
• Pagination: 55p

Subject/Index Terms

• TRT Terms: Beams; Carbon fibers; Fatigue cracking; Fiber reinforced polymers; Reinforced concrete; Reinforcing bars; Retrofitting; Temperature
• Subject Areas: Maintenance and Preservation; Materials; Transportation (General);

Filing Info

• Accession Number: 01710735
• Record Type: Publication
• Report/Paper Numbers: MPC-18-362
• Contract Numbers: MPC-412
• Files: UTC, NTL, TRIS, ATRI, USDOT
• Created Date: Jul 11 2019 5:26PM