Performance of Steel Girders Repaired with Advanced Composite Sheets in a Corrosive Environment

This report presents a two-phase research program studying (1) galvanic current influencing deterioration of carbon fiber reinforced polymer (CFRP) sheets bonded to a steel substrate and (2) electrochemical reaction for steel beams strengthened with CFRP. The first phase of the research discusses the effect of galvanic current on the behavior of the CFRP-steel interface, including changes in physical properties and mechanical characteristics. An electrochemical reaction protocol was employed to provide an accelerated corrosion environment, which degraded the performance of the interface. The corrosion-dependent response of the interface was experimentally characterized and a modeling approach was proposed to predict the propagation of interface deterioration. The second phase of the research deals with an experimental program examining the effect of an electrochemical reaction on the performance of CFRP-strengthened steel beams. An accelerated corrosion protocol was implemented and subsequent test data were obtained. The consequence of corrosion damage was physically and chemically characterized, including electric potential, mass loss, corrosion current density, corrosion rate, load-carrying capacity, interfacial strain development, failure mode, and infrared spectroscopy. It is worthwhile to note that protective layers, such as a primer, may be placed between the steel substrate and the CFRP to improve durability of the CFRP-steel interface. Design recommendations were proposed to facilitate the use of CFRP-strengthening techniques based on the fact that the accelerated test protocol reasonably represented the deterioration mechanism of constructed steel bridges; this is a typical assumption in durability research, and thus, the model was intended to guide practitioners rather than to accurately quantify the extent of corrosion damage.

• Record URL:
  https://www.ugpti.org/resources/reports/details.php?id=876
• 
• Record URL:
  https://rosap.ntl.bts.gov/view/dot/32425
• Supplemental Notes:
  • This document was sponsored by the U.S. Department of Transportation, University Transportation Centers Program.
• Corporate Authors:

  University of Colorado, Denver

  Department of Civil Engineering
  1200 Larimer Street, P.O. Box 173364
  Denver, CO  United States  80217-3364

  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:
  • Kim, Yail Jimmy
• Publication Date: 2017-6

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Photos; References; Tables;
• Pagination: 49p

Subject/Index Terms

• TRT Terms: Beams; Carbon fibers; Composite materials; Deterioration; Durability; Electrochemical corrosion; Failure; Fiber reinforced polymers; Girders; Recommendations; Steel bridges
• Subject Areas: Bridges and other structures; Highways; Maintenance and Preservation; Materials;

Filing Info

• Accession Number: 01640935
• Record Type: Publication
• Report/Paper Numbers: MPC 17-325
• Files: UTC, NTL, TRIS, ATRI, USDOT
• Created Date: Jul 13 2017 9:11AM