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Publication Number: FHWA-HRT-13-028
Date: October 2013
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Post-tensioned (PT) tendons have been widely utilized in concrete bridges in the United States. The advantages of PT bridges compared to bridges constructed using conventional reinforcement include greater span length, structural efficiency, reduced materials, and a more streamlined appearance. However, PT tendons can be susceptible to corrosion and ultimately failure if physical deficiencies (PDs) or chemical deficiencies (CDs) are present. Examples of PDs include separation, segregation, presence of soft material, and free water, while an example of a CD includes concentrations of chloride that exceed the allowable limit as specified by the American Association of State Highway and Transportation Officials and other specifications. The failure of a few tendons can compromise overall structural integrity.
Inspections of bridge PT tendons have revealed both PDs and CDs as well as strand tendon failures caused by corrosion have been reported. This study was performed to provide bridge owners with a practical protocol for inspecting, sampling, analyzing, evaluating, and responding to bridge grout concerns.
Jorge E. Pagán-Ortiz
Director, Office of Infrastructure
Research and Development
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Topics: research, infrastructure, structures
Keywords: research, structures, Post-tensioned tendons, Bridges, Corrosion, Grout, Chlorides, Grout defects, Inspection, Sampling
TRT Terms: research, infrastructure, Facilities, Structures