THE CONCRETE BRIDGE MAGAZINE

WINTER 2017

ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.

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CONCRETE BRIDGE TECHNOLOGY Implementation of Flexible Filler for Post-Tensioning Corrosion Protection in Florida by William R. Cox, American Segmental Bridge Institute On January 28, 2015, the Florida Department of Transportation (FDOT) issued Structures Design Bulletin 15-01, “Update to Revisions to Policy for Post- Tensioning Tendons,” mandating the use of flexible filler, in lieu of cementitious grout, for corrosion protection of certain post-tensioning (PT) tendons for projects under design beginning in 2015. Currently, the only FDOT-approved flexible fillers are microcrystalline petroleum-based waxes that are heated until liquid then injected to fill the PT tendon duct, providing long-term corrosion protection of the PT tendons. When flexible fillers are used, the PT tendons are designed to be unbonded and fully replaceable. Table 1 shows the required corrosion protection materials for post-tensioned tendon types in Florida. Flexible fillers are to be installed under the direct supervision of a filler injection foreman and performed by grouting technicians in the presence of a filler injection quality control inspector. Each of these personnel is required to have an American Segmental Bridge Institute (ASBI) Flexible Filler Certification. Veri fiable experience performing injection of similar flexible filler on at least two projects is currently acceptable in lieu of ASBI certification. However, this allowance will be deleted from the FDOT specifications after the first ASBI Flexible Filler Certification Training Course has been given. ASBI, FDOT, and the Post-Tensioning Institute (PTI) are sponsoring the first ASBI Flexible Filler Certification Training Course on May 9-10, 2017, in Tallahassee, Fla. This course is available to foremen, technicians, and inspectors involved with upcoming PT projects in Florida. As a prerequisite to attend the course, participants must hold current certificates as an ASBI Grouting Technician and a PTI Bonded PT Field Specialist. The course will consist of 8 hours of classroom instruction, 3 hours of laboratory demonstrations, and an exam. The course will cover all phases of flexible filler field installation. Randy Cox is the executive director of the American Segmental Bridge Institute in Buda, Tex. EDITOR'S NOTE For information regarding the requirements for the use of flexible fillers on Florida Department of Transportation projects, see the FDOT Structures Manual: http://www.fdot.gov/structures/ StructuresManual/CurrentRelease/ StructuresManual.shtm. For information regarding the ASBI Flexible Filler Certification Training, see http://www.asbi-assoc.org/index.cfm/ events/upcoming-events.

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