Corrosion performance of prestressing strands in contact with dissimilar grouts : technical summary.

Details

• Creators:
  O’Reilly, Matthew ; Darwin, David ; Browning, JoAnn
• Corporate Creators:
  University of Kansas. Dept. of Civil, Environmental and Architectural Engineering
• Subject/TRT Terms:
  • Prestressing
  • Chlorides
  • Corrosion
  • Cement grouts
  • Portland cement
  • Deterioration by environmental action
  • Corrosion tests
  • Post-tensioned prestressed concrete--Corrosion
  • Grout (Mortar)--Testing
  • Portland cement
  More +
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  Kansas. Dept. of Transportation
• Abstract:
  Inspections of post-tensioned bridges ; by the Kansas Department of Transportation ; have revealed voids in strand ducts due to ; bleeding and shrinkage of older Portland ; Cement grouts. The Kansas Department ; of Transportation is faced with a decision ; whether to fill these voids or to leave them ungrouted. As long as the voids remain dry, the ; strands typically appear intact with some surface rust. However, field observations indicate that ; severe corrosion occurs in cases in which water or water containing chlorides comes in contact ; with the strands. The usual approach to filling voids in post-tensioning ducts involves using ; prepackaged anti-bleed grouts. Unfortunately, in a number of cases, the repair operations appear ; to have led to rapid corrosion of the re-grouted strands. A likely cause of the rapid corrosion is ; a difference in electrical potential in the strands caused by differences in environment provided ; by the dissimilar grout.
  More +
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25458/dot_25458_DS1.pdf
• File Type:
  [PDF - 443.52 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:49568b1c4ab539da1ffb7abb470c0db089ddb8f5c3384a46e618e40463dfb62a9a240bfd782fac1d9ded8c62ec81834b6d6345e241f914b06083ebff665301fa