Behavior of 20 Post-Tensioned Test Beams Subject to up to 2200 Cycles of Freezing and Thawing in the Tidal Zone at Treat Island, Maine

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Title: Behavior of 20 Post-Tensioned Test Beams Subject to up to 2200 Cycles of Freezing and Thawing in the Tidal Zone at Treat Island, Maine

Author(s): M. Schupack

Publication: Special Publication

Volume: 65

Issue:

Appears on pages(s): 133-152

Keywords: accelerated tests; anchorage (structural); beams (supports); chlorides; composite materials; concrete durability; epoxy resins; exposure; freeze-thaw durability; grouting; I-beams; marine atmospheres; post tensioning; prestressing steels.

Date: 8/1/1980

Abstract:
Twenty post-tensioned I beams, eight feet long, were placed in the tidal zone at Treat Island, Maine in 1961 to determine the behavior of various types of end anchorage protection. In 1973 and 1974, eight beams were removed to the Vicksburg Waterways Experiment Station for testing and detailed examination. The behavior of all components of the eight beams are reported on, as well as the behavior of the twelve remaining beams still in the tidal zone. The continuing study has revealed some unexpected behavior of concrete and epoxy. It has shown that in eleven years, the prestressing steel was not structurally damaged by exposure to severe freezing and thawing sea-water environment and that the same seems to be indicated for the beams exposed seventeen years. The best type of end anchor protection appears to be a flush or pocket type.