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Use of Carbon Fiber Composite Wrap and External Post-Tensioning to Strengthen Prestressed Concrete I-Beams in the Hampton Roads Bridge Tunnel Approach Spans


Total Credits: 0.5 PDH

Category:
Technical Presentations
Presenter(s):
Michael Sprinkel
Duration:
37 Minutes
Format:
Audio and Video
License:
Access for 6 month(s) after purchase.



Description

The prestressed beams in the Hampton Roads Bridge Tunnel Approach Spans were fabricated in about 1960 (west bound lane) and 1970 (east bound lane). The spans are 50-ft and 75-ft, respectively. The brackish water environment caused corrosion and failure of the bottom strands and deterioration and spalling of the cover concrete in many beams. A project in 2018 strengthened 30 of the more deteriorated beams as an alternative to posting or replacing the bridges. Carbon fiber composite wrap (CFCW) and external post-tensioning (PT) were used to strengthen the beams. Prior to construction, a PT mockup was done with one 50-ft (flexible filler) and one 75-ft (grout) beam to demonstrate that the contractor had the materials, equipment and staff to successfully do the external PT. This presentation describes the project’s mockups and construction and the anticipated increase in strength to be obtained from application of the CFCW and external PT.

Learning Objectives:

  1. Understand the mockups of two post-tensioned beams.
  2. Understand construction to strengthen 30 beams.
  3. Understand the increase in strength of beams through examples.
  4. Learn cost benefits.

Presenter(s)

Michael Sprinkel's Profile

Michael Sprinkel Related seminars and products

Associate Director

VA Transportation Research Council


Michael M. Sprinkel, PE, Senior Research Scientist, is past Associate Director at the Virginia Transportation Research Council where he had served in various research positions between 1972 and 2019. He directed the Materials Research Program from 1992 through 2017 and the Structures Research Program from 2017 through 2019. He is currently working part-time as a Senior Research Scientist. He has published 116 papers and 68 reports with an emphasis on polymer and hydraulic cement concretes used for the protection, repair, rehabilitation, and replacement of concrete structures. He is a Fellow of the American Concrete Institute, the American Society of Civil Engineers, and the Post-Tensioning Institute. He has BS (72) and ME (75) Degrees in Civil Engineering from UVA.


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