Grouted tendons are predominantly used for post-tensioned concrete bridge elements in the United States. However, because of potential durability issues with grouted tendons, some highway agencies have opted to use ungrouted tendons for post-tensioning to facilitate replacement.
NCHRP Research Report 1139: Considerations for the Design and Construction of Bonded and Unbonded Post-Tensioned Concrete Bridge Elements, from TRB's National Cooperative Highway Research Program, provides information on the different aspects of the design and construction of post-tensioned concrete bridge elements with unbonded tendons or a combination of bonded and unbonded tendons.
National Academies of Sciences, Engineering, and Medicine. 2025. Considerations for the Design and Construction of Bonded and Unbonded Post-Tensioned Concrete Bridge Elements. Washington, DC: The National Academies Press.
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