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• 2021-05-02

Evaluation of Techniques to Remove Defective Grout from Post Tensioning Tendons The objective of this project was to evaluate defective grout removal techniques for post tensioning tendons Project number BDV31 977 58 Principal investigator H R TreyFor the Department s policy on post tensioned bridges refer to the current Evaluation of High Density Polyethylene Ducts of the Sunshine Skyway Bridge Aug 12 2004 2 0mb Test and Assessment of NDT Methods for Post Tensioning Systems in Segmental Balanced Cantilever Concrete Bridge Report Feb 15 2003 20mb 462 Post Tensioning 462 1 Description Furnish all post tensioning system components from a single supplier System must be approved and meet the requirements of Section 960 Posted to the Department s Approved Post Tensioning Systems Webpage 462 2Structures Design Bulletin 15 03 Design and Construction Requirements for Post Tensioning Tendons Page 2 of 30 www dot state fl us anchorage See the Approved Post Tensioning Systems website for more information Strand couplers as described in LRFD 5 4SRT 350 Eight Post APL Product Supplier Trinity Highway Products Model Number SRT 350 Eight Post APL Number 536 002 008 Specification Guardrail Product Type End Anchorage Assembly 27 quot Approach Terminal NCHRP 350 Limitation Approved for projects let on or before June 30 2014

Manufacturers seeking approval of PT systems for inclusion on the Structures Design Office SDO list of Approved Post Tensioning Systems must use materials and components meeting requirements of this Section and Section 462 Specific requirements for enhanced post tensioning systems are provided in the following sections 1 1 Qualified Products List Requirement 1 A In the future all post tensioning systems must be selected from the Department s Qualified Products List QPLEach external post tensioning tendon contains 22 strands that are encased with a HDPE duct The strands used in the bridge are 0 6 in 15 mm diameter ASTM A416 Grade 270 seven Epoxy Types as listed in FDOT spec Section 926 From Florida DOT Specifications for Road and Bridge Construction website Type A An epoxy for use in post tensioning anchorage protection systems See the Florida DOT Product Evaluation and Qualified 462 Post Tensioning 1 926 Epoxy Compounds 9 937 Post Installed Anchor Systems for Structural Applications in Concrete Elements

Background Bridge Description Bridge No 720677 Wonderwood Connector Bridge is located over the Inter coastal Waterway on SR 166 north east of Jacksonville FL The total bridge length is 3584 and 90 9 wide deck consisted of 8 lines of prestressed FDOT s post tensioning policy that requires replaceable tendons have led to revisions of standard practices for post tensioning bridge structures With the growing popularity of curved precast concrete spliced U girders engineers saw a need to update andFill Flex 200 APL Product Supplier The Trenton Corporation Model Number Flexible Filler APL Number 938 003 003 Specification Duct Filler For Post Tensioned Structures Product Type Flexible Filler Microcrystalline Wax Comment quot This product is approved for heated installations only quot VSL post tensioning systems are certified according to European Technical Approval which can be used in all EU EFTA countries A post tensioning tendon consists of strands duct and anchorages Tendons of the multistrand VSL system may be made up of as much as 55 seven wire strands of 15 7 mm 0 6 S in diameter with a guaranteed ultimate strength of 1860 MPa Systems bridge projects involving movable spans significant post tensioning operations pre cast segmental components and steel structures with large horizontal and vertical curvature Multiple third party involvement railroads utilities airports

Post tensioning end anchorages are protected by a four level system comprising grout heavy duty permanent grout caps with sealing O ring an applied coating and enclosure withFig 16 1 Examples of Vehicle Barrier Cable Systems 285 POST TENSIONING MANUAL I Cost per Linear Foot of Barrier Openings in the guard must be limited such that a 4 in 102 mm diameter sphere cannot pass Masonry and cast in place spandrels are 42 in high and through any opening up to a height of 34 in 864 mm 462 4 2 Post Tensioning System Use approved post tensioning systems of the proper size and type to construct tendons shown on the Contract Documents Substitution of components of approved post tensioning systems is not permitted For permanentpost tensioning system components structural design and detailing aspects and tendon installation and replacement procedures 17 Key Words Post tensioning bridge design box girder replaceable deviator diablo double enveloped2020 8 19 nbsp 0183 32 FDOT Work Group 5 0 Bridge Inspection This work group is defined as the on site inspection load rating and preparation of bridge inspection reports in accordance with approved federal and state statutes policies guidelines and standards Availability of required

Also post tensioning systems must now be tested and approved for leak resistance and all grouting must be done by ASBI certified grouting technicians Further requirements specifying the number of tendons in certain elements have been University of South Florida Scholar Commons Graduate Theses and Dissertations Graduate School 11 8 2016 Effective Post Tensioned Splicing System for Prestressed Concrete Piles Zhongxin Wu University of South Florida wuzx88 yahoo com Follow this and2021 10 11 nbsp 0183 32 462 Post Tensioning 462 1 Description Furnish all post tensioning system components from a single supplier System must be approved and meet the requirements of Section 960 Posted to the Department s Approved Post Tensioning Systems WebpageThe approved post tensioning systems and grouting systems are listed in TfNSW Internet website refer Clauses 2 1 and 10 2 1 2 6 Referenced Documents and Abbreviations Codes standards specifications and test methods are referred to in abbreviated form New Problems continued In March and May 2012 FDOT discovered two more segmental bridges built in 2010 and 2004 with soft grout in the internal and some external tendons In April 2012 FDOT discovered a post tensioned girder bridge built in 2003 with