Temporary Corrosion Protection and Bond of Prestressing Steel

This study investigates the performance of different temporary corrosion protection methods for prestressing steel. Four types of laboratory corrosion tests with three emulsifiable oil products in three concentrations resulted in the selection of one product that showed by far the best corrosion protection behavior. Field tests during the winter on 16 transverse deck post-tensioning tendons of 2 road bridges demonstrate the practical suitability of the selected product. Using this product, a pullout test with a long embedment length was performed on a post-tensioned seven-strand tendon with a plastic duct and compared with a reference test using untreated strands. A bond shear stress reduction by a factor of approximately 2.5 was observed compared with the untreated strands. This reduction does not appear to significantly influence the load-deformation response of post-tensioned concrete members and suggests that the emulsifiable oil does not need to be removed before grouting of the tendons. However, since the bond reduction caused by emulsifiable oils in grouted tendons may lead to a somewhat soft load-deformation response of post-tensioned concrete members in the decompressed state, a lower-bound estimate of the corresponding stiffness can be obtained if necessary by assuming a completely unbonded behavior of the post-tensioning tendons.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/13846957
• Authors:
  • Marti, Peter
  • Ullner, Robert
  • Faller, Markus
  • Czaderski, Christoph
  • Motavalli, Masoud
• Publication Date: 2008-1

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References;
• Pagination: pp 51-59
• Serial:
  • ACI Structural Journal
  • Volume: 105
  • Issue Number: 1
  • Publisher: American Concrete Institute (ACI)
  • ISSN: 0889-3241
  • Serial URL: http://www.concrete.org/PUBS/JOURNALS/SJHOME.ASP

Subject/Index Terms

• TRT Terms: Adhesive bond strength; Corrosion protection; Corrosion resistant materials; Field tests; Grout; Highway bridges; Laboratory tests; Material tendons; Posttensioning; Prestressed concrete; Prestressing; Pull out test; Steel
• Uncontrolled Terms: Emulsifiable oils
• Subject Areas: Bridges and other structures; Design; Geotechnology; Highways; Materials; I24: Design of Bridges and Retaining Walls; I32: Concrete; I34: Steels and Metals;

Filing Info

• Accession Number: 01088138
• Record Type: Publication
• Files: TRIS
• Created Date: Jan 31 2008 7:51AM