A historical review of the use of epoxy protected strand for prestressed rock anchors

摘要

Fusion bonded epoxy protected strand has been used in post tensioning applications in North America since 1983, with the first ground anchor project undertaken in 1985. The product has been used in dam anchor tendons since 1991. A recent and significant problem at Wirtz Dam, TX has focused industry attention on vital issues relating to the production, testing, specification, installation, and stressing of the material. It is clear that this problem has raised questions in the industry regarding the use of the product, but the authors believe that through the development and application of appropriate codes, standards, recommendations, and specifications, the inherent advantages of the material can again be routinely exploited in sensible fashion for mutual benefit. The paper provides a historical and technical overview of the use of epoxy protected tendons, primarily in dam rehabilitation.