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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Observations and Testing of Post-Tensioned Beams Exposed to Severe Weathering for 33 Years
Author(s): Morris Schupack and Edward F O'Neill
Publication: Special Publication
Appears on pages(s): 383-408
Keywords: adhesives; anchorage (structural); concretes; corrosion; durability; freeze thaw durability; grout; joints (junctions); post-tensioning; prestressing; prestressing steels; unbonded prestressing; Materials Research
Abstract:To determine the most effective end-anchorage protection for post- tensioned beams, 20 air-entrained post-tensioned concrete beams were fabricated and placed at the Treat Island severe exposure station in 1961. The beams were fabricated using four types of post-tensioning systems with 12 different types of end-anchorage protection over external and recessed anchorages. End- anchorage protection was applied to the beams using six different types of joint preparation: bush-hammering, epoxy adhesive on sandblasted concrete surface, retarding agent, sandblasted, sandblasted with primer, and no preparation. The end protections were made from three different mixtures: portland cement concrete, epoxy concrete, and sand-cement mortar. The 20 post-tensioned test beams have been inspected annually by the Corps and biennially by other interests. Eleven of the beams were autopsied at the Waterways Experiment Station (WES) in 1973-74 and 1983. This paper assembles the data obtained, evaluates the data, and summarizes the important findings related to durability. The main findings are that the flush (recessed) anchorage protection using portland cement concrete is the superior detail. The external portland cement concrete anchorage protection, properly anchored with reinforcing steel across the join with adequate concrete cover, also provides an effective protection.
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