Effective Structural Concrete Repair - Volume 2 of 3: Use of FRP to Prevent Chloride Penetration in Bridge Columns

Yearly, over 500 million dollars are spent on the chemical deicing of roadways to improve travel conditions during winter snow and ice storms. The chlorides within the salts however act as a catalyst in the corrosion of reinforcement in reinforced concrete. It is estimated that several billion dollars are needed to rehabilitate the nation's bridges that have deteriorated due to this reinforcement corrosion. Several researchers have observed that if a barrier protection system against corrosion was installed at the time of construction, corrosion could be prevented. This report summarizes the initial stages of an investigation of one such system. Five different fiber reinforced polymer (FRP) wrap systems, applied to prevent chloride penetration into the concrete, are being evaluated in the laboratory and field. In the field portion, reinforced concrete columns at five different sites had a FRP barrier system installed. These five columns are being monitored yearly to determine if chlorides, from deicing salts applied to adjacent roadways during winter months, have penetrated the wrap. In the laboratory, an AASHTO ponding test was initiated on concrete slabs constructed to evaluate one layer, two layers, and three layers of the same five different FRP wrap systems. In addition to the FRP wrap systems, two protective top coats were installed on the same concrete slab. The concrete slab was then subjected to a 3% sodium chloride solution during 90 day ponding cycles. To date, a single layer of all five FRP wrap has been effective in preventing chlorides from penetrating into the concrete. However, in this case, level of chlorides in the concrete is still below the threshold limit. The effectiveness of the five FRP systems, based on both the field and laboratory data, will be presented in a supplementary report at the conclusion of this investigation.

• Record URL:
  http://publications.iowa.gov/2506/1/tr428vol2.pdf
• 
• Corporate Authors:

  Iowa State University, Ames

  Department of Civil, Construction and Environmental Engineering
  Town Engineering Building
  Ames, IA  United States  50011-3232

  Iowa Department of Transportation

  800 Lincoln Way
  Ames, IA  United States  50010

  Iowa Department of Transportation

  Iowa Highway Research Board, 800 Lincoln Way
  Ames, IA  United States  50010
• Authors:
  • Klaiber, F W
  • Wipf, T J
  • Kash, E J
• Publication Date: 2004-3

Language

• English

Media Info

• Media Type: Print
• Edition: Final Report
• Features: Appendices; Figures; References; Tables;
• Pagination: 134p

Subject/Index Terms

• TRT Terms: Bridges; Chlorides; Columns; Corrosion; Corrosion protection; Deicing chemicals; Fiber reinforced materials; Field tests; Laboratory tests; Reinforced concrete; Repairing
• Uncontrolled Terms: Chloride penetration; Fiber reinforced polymer wraps; Structural concrete
• Subject Areas: Bridges and other structures; Design; Geotechnology; Highways; Materials; I24: Design of Bridges and Retaining Walls; I32: Concrete; I35: Miscellaneous Materials;

Filing Info

• Accession Number: 01001428
• Record Type: Publication
• Report/Paper Numbers: Iowa DOT Project TR - 428 (Volume 2)
• Files: TRIS, STATEDOT
• Created Date: Jun 30 2005 10:56AM