Evaluation and Repair of Unbonded Post-Tensioned Concrete Structuresby Randall W. Poston, KCI Technologies, Inc, Manassas, United States,
Abstract: As with other forms of infrastructure, there is an ever increasing need to repair and strengthen unbonded post-tensioned concrete structures. Repairs may be necessitated for a variety of reasons ranging from a change in space requirements to deterioration of concrete and corrosion of post-tensioning components. Although most unbonded post-tensioned concrete structures have good long-term performance records, corrosion problems have occurred because of poor construction practices, poor quality plastic sheathing, lack of good-quality corrosion inhibiting grease and poor end anchorage and stand extension protection. With as background, techniques and procedures to evaluate and repair unbonded post-tensioned concrete structures are presented.
Subject Headings: Concrete | Rehabilitation | Tension | Concrete structures | Corrosion | Tensile structures | Concrete construction | Plastics
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