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Bonded Repair of R/C Bridge Components using FRP Wrapping – McDade Road Bridge over US 40 Peter Chang Bala Balaguru March 23, 2010
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University of Maryland
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High Strength Composites Fiber Reinforced Polymers(FRP) Fibers: carbon, glass Matrix: organic polymers Applications: aerospace, ship building, automobiles, rail cars, Concrete structures
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Common Tow Reinforcements
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Common Fabric Reinforcements
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Advantages of FRP High Strength Low unit weight High specific strength Corrosion resistance Used for more than 40 years
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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
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Applications of Inorganic Polymer in Civil Infrastructure Durable and fire resistant Strengthening; bricks, concrete, reinforced concrete Protective and graffiti resistant coatings Sandwich panels
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Appearance of Inorganic FRP Compared to Organic FRP Organic FRP Inorganic FRP
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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).
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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
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Alumino-silicates as Binder
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Polycondensation into poly(sialate) and poly(sialate-siloxo)
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three dimensional macromolecular edifice
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Research in Coating Technology
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Making heat-resistant Geopolymer Composite
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Application of Technology for Bridge Protection
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Geopolymer Protective Coating
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2-year Old Test Patch
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Surface Coating of Concrete Uncoated surfaceCoated surface
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Close-up of Coated Concrete
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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
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Wet – Dry Durability
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Peak Load of Samples after Wet-dry Exposure
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Peak Load of Samples after Scaling Exposure
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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
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OSU Test on Composite
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Sample After Fire Testing Facings visibly charred from intense heat Rough surface with minor cracking Sample dimensions change, including weight
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Failure Pattern No delamination No build-up of shear strain at the interface Strain in fiber comparable to organic matrix
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Crack Patterns from Flexure Test PC 2IO-1 3IO-1 4IO-2 5IO-2 2O-1 3O-2 4O-1
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Thank you. pchang@umd.edu (301) 405-1957 www.cee.umd.edu
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