1 / 31

Bonded Repair of R/C Bridge Components using FRP Wrapping – McDade Road Bridge over US 40

Bonded Repair of R/C Bridge Components using FRP Wrapping – McDade Road Bridge over US 40. Peter Chang Bala Balaguru March 23, 2010. University of Maryland. High Strength Composites Fiber Reinforced Polymers(FRP). Fibers: carbon, glass Matrix: organic polymers

johnson
Download Presentation

Bonded Repair of R/C Bridge Components using FRP Wrapping – McDade Road Bridge over US 40

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Bonded Repair of R/C Bridge Components using FRP Wrapping – McDade Road Bridge over US 40 Peter Chang Bala Balaguru March 23, 2010

  2. University of Maryland

  3. High Strength CompositesFiber Reinforced Polymers(FRP) • Fibers: carbon, glass • Matrix: organic polymers • Applications: aerospace, ship building, automobiles, rail cars, Concrete structures

  4. Common Tow Reinforcements

  5. Common Fabric Reinforcements

  6. Advantages of FRP • High Strength • Low unit weight • High specific strength • Corrosion resistance • Used for more than 40 years

  7. Major Disadvantage • Low resistance to high temperature (fire) • Fire hazard in transportation structures, 31% as compared to 37% flooding and 8% earthquake • Restricted use in buildings • Restricted use in tunnels • Coef. of thermal expansion >> concrete • Some high temp matrix is highly toxic

  8. Applications of Inorganic Polymer in Civil Infrastructure • Durable and fire resistant • Strengthening; bricks, concrete, reinforced concrete • Protective and graffiti resistant coatings • Sandwich panels

  9. Appearance of Inorganic FRP Compared to Organic FRP Inorganic FRP Organic FRP

  10. Superior Properties of Geopolymer • First: • Sets at room temperature; non toxic. • Second: • higher heat tolerance. • Third: • Geopolymers resist all organic solvents (and are only affected by strong hydrochloric acid).

  11. Features of the Inorganic Matrix • Polysialate (“Geopolymer”) • Aluminosilicate • Water-based, non-toxic, durable • Curing temperature: 20, 80, 150°C • Resists temperatures as high as 1000°C • Protects carbon from oxidation

  12. Alumino-silicates as Binder

  13. Polycondensation into poly(sialate) and poly(sialate-siloxo)

  14. three dimensional macromolecular edifice

  15. Research in Coating Technology

  16. Making heat-resistant Geopolymer Composite

  17. Application of Technology for Bridge Protection

  18. Geopolymer Protective Coating

  19. 2-year Old Test Patch

  20. Surface Coating of Concrete Uncoated surface Coated surface

  21. Close-up of Coated Concrete

  22. Durability Tests: As Coating Material • WET-DRY EXPOSURE (0, 50,and 100 cycles) • SCALING EXPOSURE (50cycles) Samples Reinforced with: • 2 and 4% discrete carbon fibers • 1, 2, and 3 carbon tows • 1 and 2 layers of carbon fabric

  23. Wet – Dry Durability

  24. Peak Load of Samples after Wet-dry Exposure

  25. Peak Load of Samples after Scaling Exposure

  26. Typical Sample Prior to Test • Balsa wood core with inorganic carbon fiber facings • Smooth & glossy • Sample dimensions: • 4 inches wide • 4 inches long • ¼” inch thick

  27. OSU Test on Composite

  28. Sample After Fire Testing • Facings visibly charred from intense heat • Rough surface with minor cracking • Sample dimensions change, including weight

  29. Failure Pattern • No delamination • No build-up of shear strain at the interface • Strain in fiber comparable to organic matrix

  30. PC 2IO-1 3IO-1 4IO-2 5IO-2 2O-1 3O-2 4O-1 Crack Patterns from Flexure Test

  31. Thank you. pchang@umd.edu (301) 405-1957 www.cee.umd.edu

More Related