More than 1.5 billion square feet of unbonded post-tensioned structures have been built in the United States since the mid-1960s. Unfortunately, many of these structures were not designed or built with adequate corrosion protection of the post-tensioning strands and anchors. Consequently, repair of unbonded post-tensioned structures has become a major segment of the concrete repair market, with anchor replacement and tendon splicing or replacement being the most common types of repair. This article offers solutions to a few common problems, including how to:

  • Splice and tension a severed tendon at the break
  • Replace a severed section of tendon with a new section, and then retension the new tendon at an existing or replacement anchor
  • Replace an anchor without detensioning the entire tendon
  • Detensioning and replacing an unbroken tendon