Presentation on theme: "The World’s First Thermoplastic Bridges made of Recycled Plastics"— Presentation transcript:
1 The World’s First Thermoplastic Bridges made of Recycled Plastics John S. Kim, PhD, PE, Senior Professional Associate, Parsons BrinckerhoffOctober 10, 2013
2 U.S. Highway Bridges 600,000 highway bridges in U.S. One third of them built immediately after World War IIThe use of deicing materialIncreased traffic volume and weightStructurally deficient or functionally obsolete
3 Bridges in Trouble $229 billion bridge issue When people in ties and suites frequently appear under the bridges, it means a serious business!60 percent of 600,000 US highway bridges are short-span bridges.
4 Why Recycled Plastic? Plastic waste: global issue 100 million tons each year worldwideHard to degradeRecycled plastics are hardly reused.Enhanced properties from constant R&DCollective efforts for green solutionsGovernments’ incentives on the use of green products
6 Thermoplastic Composite Recycled PlasticImmiscible Polymer BlendHigh Density Polyethylene with Polystyrene or Polypropylene coated glass fibers6
7 Product Advantages Green Product (Recycled Plastic) No Corrosion, Rotting or Insect InfestationReduced Landfill DumpingGood Toughness CharacteristicsNo Chemical AdditivesGreen House Gas SavingsReduced MaintenanceSustainable & DurableCost Competitive: Initial and Life Cycle7
10 Design Considerations Ultraviolet Degradation: Less than inches/year (in full sun exposure)Moisture Absorption: Virtually impervious, retains properties in humid and wet environmentsThermal Resistance: Heat deflection temperature is 125 deg C and material viable to -125 deg CEnvironmental Resistance: Resistant to attack by marine borers, insects, rot and corrosionAcid Resistance: Resistant to most acids and salts
11 Design Considerations (Cont’d) Creep: High Factor of Safety with respect to Ultimate Stress lowers creep considerablyAbrasion: Highly Resistant to salts and sand occurring in Marine environmentsSkid Resistance: Coefficient of Friction = 0.5 with Tire (can be improved with surface texturing)Abutment Backfill: Prefer light weight materialColor: Basic color is Graphite but can be produced in Gray, Beige, etc.
14 Fort Leonard Wood, MO 1998 W = 26 ft; L = 24 ft Max Load = 25,000 lbs. 14
15 Wharton State Forest, NJ * Length - 56 feet* Live Load - HS 205 large I-beams rest on piles6 small I-beams lock into place perpendicular to the large I-beamsThe top surface of the large I-beams serves as decking along with tongue and groove decking laid down parallel to the large I-beams200215
16 Fort Bragg, NC 2009 Load Bearing Capability M1 Abrams Tank on the Bridge200916
17 Fort Bragg Construction Pile Cap InstallationDriving RSPC piles17
18 World’s First Railroad Bridges Fort Eustis, Virginia2010Bridge No. 3Bridge No. 7
19 World’s First Railroad Bridges Fort Eustis, VirginiaBridges No. 3 and No. 7Live Load: Cooper E60 and 260 Kip alternate loading with 20% impactDeflection: L/600Length of Piles: about 45 feetCapacity of piles: 17 – 20 tons in end bearing per PileAbutments: Existing timber abutments retainedRSPC Elements: Railroad ties, curbs, girders, shear blocks, pier caps, piles and transverse connectors
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