The series described in  consisted of five concrete girders (TR01-TR05) with tendons for posttensioning
Since steel cables require posttensioning forces, the initial configuration of the bridge under the dead loading must be identified in advance.
The former is a set of trial initial posttensioning cable forces, which are estimated by means of simple design rules commonly adopted in the context of bridge design [26-28], whereas the latter is defined by an incremental value, representing the unknown quantity to be identified in the solving procedure.
Posttensioning in each girder web that provided the longitudinal strength for the box girder would occur at completion of the girder and as soon as the design concrete strength was reached.
The bridge failed at its midpoint because, before posttensioning, that is the weakest portion of a concrete girder section.
See: Form release agents; Jacks, prestressing; Posttensioning
steel & accessories; Precast/prestressed concrete products; Precasting supplies & accessories; Prestressing accessories; Prestressing steel & accessories; Testing services, equipment & materials; Tie wire; Tie wire reels & tools; Vibrating screens
TxDOT found that posttensioning, completed after the panels were installed, generally took just a few hours for each section of pavement.
Aside from demonstrating the efficacy of placing the slabs on grade, the Georgetown project demonstrated the viability of posttensioning the panels together in place.
The contractor completed posttensioning in a few hours the morning following installation of the panels.
See: Anchor bolts; Anchors; Column forms; Custom forms; Dowels & related items; Epoxy-coated bar; Form release agents; Form ties; Galvanized bar; Glass-fiber-reinforced polymer bar; Grout, cementitious; Jacks, prestressing; Posttensioning
steel & accessories; Precasting supplies & accessories; Prestressing steel & accessories; Reinforcement positioners; Reinforcement accessories; Reinforcement, mechanical splices; Retaining wall accessories, segmental; Retaining wall systems, segmental; Rock bolts & tiebacks; Seismic anchors & reinforcement; Shoring; Specialty reinforcement; Steel bar; Tie wire; Waterstops
also increases durability by minimizing or even eliminating cracking, and ties the individual panels together, promoting load transfer between the panels.