Accession Number : ADA329992

Title :   Durability of Posttensioned Concrete After 33 Years of Marine Exposure.

Descriptive Note : Final rept.,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB

Personal Author(s) : Schupack, Morris ; O'Neil, Edward F.

PDF Url : ADA329992

Report Date : SEP 1997

Pagination or Media Count : 86

Abstract : To determine the most effective end anchorage protection for posttensioned beams, 20 air-entrained posttensioned beams were fabricated and placed at the Treat Island Severe Weather Exposure Station in 1961. The beams were fabricated using 4 types of posttensioning 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-resin adhesive on sandblasted surface, retarding agent, sandblasted, sandblasted with primer, and no preparation. The end protections were made from three different mixtures: portland-cement, epoxy-resin concrete, and sand-cement mortar. The 20 posttensioned test beams have been inspected annually by the Corps and biennially by other interests. Eleven of the beams have been autopsied at the U.S. Army Engineers Waterways Experiment Station in 1973-74 and 1983. Now, with 33 years of exposure of nine beams and the autopsy data, this report has been prepared jointly by Mr. Morris Schupack, Schupack Suarez Engineers, Inc., and Mr. Edward F. O'Neil, U.S. Army Engineer Waterways Experiment Station. It assembles the data obtained, evaluates the data, summarizes the important findings related to durability, and makes recommendations for durable details.

Descriptors :   *PRESTRESSED CONCRETE, PREPARATION, CORROSION, EXPOSURE(GENERAL), FABRICATION, CONCRETE, STEEL, PROTECTION, EPOXY RESINS, ADHESIVES.

Subject Categories : Construction Equipment, Materials & Supplies

Distribution Statement : APPROVED FOR PUBLIC RELEASE