Corrosion of prestressing strands has required replacement of external post-tensioning tendons in several existing post-tensioned bridges. External tendons are commonly used in concrete box girder bridges constructed using the span-by-span or balanced cantilever methods. Currently in the US, external tendons are discretely bonded at anchorages and deviator locations. Replacement of these types of tendons is a complex and time-consuming operation with safety concerns for personnel. Under task order 5009, WSP conducted a state-of-the-art review, then developed and presented guidance for fully replaceable grouted external tendons. Specific details included post-tensioning system components, structural design and detailing aspects, and tendon installation and replacement procedures.
Prestressed concrete is frequently used worldwide in infrastructure construction and offers considerable advantages over conventional reinforced concr...
In Michigan’s winter climate, the steel reinforcements in traditional boxbeambridges are susceptible to concrete cracking, deterioration andcorrosio...
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