Development of a Non-Destructive Testing (NDT) Tool for in-Situ Assessment of Prestressed Components

Project Details
STATE

NE

SOURCE

TRID

START DATE

07/01/17

END DATE

12/31/18

RESEARCHERS

Jinying Zhu, G Morcous

SPONSORS

Nebraska DOT, FHWA

KEYWORDS

Bridge decks, Concrete bridges, Cracking, Creep, Design load, Nondestructive tests, Service life, Shrinkage, Superstructures

Project description

Prestressed/precast concrete girders are the most widely used superstructure system in highway bridges in Nebraska. Recently, the use of prestressed/precast concrete for deck construction have gained considerable attention of state officials to accelerate bridge construction and reduce maintenance cost. In all prestressed concrete systems, loss of prestress occurs immediately after production due to elastic shortening and during construction and operation due to shrinkage and creep of concrete and relaxation of prestressing steel, which are inevitable time-dependent phenomena. All of these effects reduce the pre-compression of the tension fibers of the concrete component and could significantly affect the component performance under service loads resulting in frequent cracking.
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