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Development of a Polymer Wear Surface for a FRP Composite Bridge Deck

Acknowledgements. Virginia Transportation Research CouncilStrongwell CorporationLandford Brothers ContractorsDow PlasticsReichhold ChemicalsMaterials Response GroupCenter for Adhesive and Sealant ScienceAdhesive and Sealant Council Education Foundation. Strongwell Bridge Deck. Field Application.

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Development of a Polymer Wear Surface for a FRP Composite Bridge Deck

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    1. Development of a Polymer Wear Surface for a FRP Composite Bridge Deck D.C. Haeberle, L.A. Harris, J.J. Lesko, J.S. Riffle, and T.E. Cousins Materials Response Group Virginia Tech

    3. Strongwell Bridge Deck

    4. Field Application

    5. Presentation Overview Project Description Sample Preparation Tests Conducted Discussion of Results Conclusions

    6. Project Description Evaluation of the effects of sample variables on the properties of a polymer wear surface produced on a pultruded glass-reinforced isophthalic polyester surface for bridge deck applications.

    7. Sample Parameters Resins Derakane 411-350 Vinyl Ester Derakane 8084 Toughened Vinyl Ester Aquathane Polyurethane Thickness 1 Layer (about 1/16 in.) 2 Layers (about 3/16 in.) 3 Layers (about 5/16 in.)

    8. Sample Components

    9. Sample Preparation Step 1: Perform plate surface preparation Step 2: Apply thick coat of polymer resin Step 3: Pour aggregate over uncured resin Step 4: Allow resin to cure at room temperature Step 5: Brush off loose aggregate Step 6: Repeat steps 2-5 until for each additional layer Step 7: Apply a top coat of polymer resin

    10. Sample Properties

    11. Percent Conversion of Vinyl Ester

    12. Tensile Rupture Strength Test VTRC test method Modified & improved for Instron Testing 200 psi strength desired

    13. Tensile Rupture Strength Results

    14. Failed Specimens Highly variable results due to brittle nature of the material Adhesive, Cohesive, and Substrate Failures

    15. Weigh Station Deck Model: Vertical Deflection

    16. Strain-to-Failure Test ASTM D-790 4-point bend test Wear surface on the tensile side Strain measured with an extensometer mounted to wear surface >0.2% strain-to-failure desired

    17. Strain-to-Failure Results: Resin Comparison

    18. Strain-to-Failure Results: Surface Comparison

    19. Failed Specimen: Acetone Wash Crack causes immediate debond of wear surface from composite plate Brittle fracture behavior observed, cracks propagate through resin and aggregate (good particle adhesion)

    20. Failed Specimen: Grit-Blasted Crack causes no immediate debond of the wear surface from the composite plate Crack slowly propagates under the surface veil of the composite substrate

    21. Strain-to-Failure Results: Temperature Comparison

    22. DMA Results

    23. Conclusions Toughened vinyl ester provides 30% higher strain-to-failure but 90% less adhesion to the composite surface (acetone washed) Grit-blasting essential for required adhesion and prevention of catastrophic debonding upon surface fracture Smooth round aggregate provides higher strain-to-failure than the sharp quartz aggregate

    24. Troutville Weigh Station

    25. Preliminary Nanoindentation of a Composite Fiber Pultruded Vinyl Ester Matrix/Carbon Fiber/G’ Fiber Sizing Digital Instruments Nanoscope with Hysitron Indentor

    26. Load - Deflection Curve

    27. UV Testing Strategy Outdoor/Indoor Exposure of Low Cost Vinyl Ester Matrix Composites Determine if a Relationship between Indoor and Outdoor Exposure Exists and Develop that Relationship Determine the Effects of Exposure on Tensile Strength

    28. UV Exposure Equipment

    29. Sunlight Spectra

    30. Current Work in the Development and Implementation of Low Cost Composites for Infrastructure Applications David Haeberle MRG Group Meeting February 17, 2000

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