POST-TENSIONING TENDONS AFTER 35 YEARS IN A FOURTEEN 36.6 M SPAN BRIDGE

The demolition of the post-tensioned superstructure of the 35-year- old, fourteen 36.6 m simple span bridge, provided the opportunity to evaluate the performance of grouted 7 mm wire tendons. Tendons grouted with a portland cement grout, without added chlorides, performed well and were generally free of corrosion if the sheaths were mostly grout filled. If ungrouted, or partially grouted, wire conditions ranged from no corrosion, with most wires showing superficial corrosion, and at worst, severe dissolution corrosion in several wires of a tendon. Tendons grouted with chloride-laden grout suffered severe wire and sheath dissolution/corrosion with numerous wire failures. Longitudinal web cracks associated with tendon profile were caused by freezing of entrapped water and/or corrosion induced by chloride-laden grout. The difficulties in determining extent of wire corrosion from external observations or occasional excavations to the tendons are discussed. Details of findings of tendon conditions are presented. (A) For the covering abstract see IRRD 867793.

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 36-50

Subject/Index Terms

Filing Info

  • Accession Number: 00675057
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 1-85075-723-2
  • Files: ITRD
  • Created Date: Mar 28 1995 12:00AM