Roadworks

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Roadworks

  1. 1. ROADWORKS TE 552 Nonwoven Product Development Neslihan Yagmur
  2. 2. Why Geotextiles in Roads? • Geotextiles are widely used for filtration and separation in road constructions, to prevent migration and mingling of materials, yet allowing free movement of water.
  3. 3. Materials • Polyethylene terephthalate (PET) • Polypropylene (PP)
  4. 4. Methods • Thermally bonded • Needlepunched
  5. 5. DuPont™ Typar® SF • DuPont™ Typar® SF is a thermally bonded nonwoven geotexile, made of 100% polypropylene which is designed to have a combination of – a high initial modulus (stiffness) – high elongation (typically > 50%) – outstanding uniformity
  6. 6. DuPont™ Typar® SF
  7. 7. DuPont™ Typar® SF • In the fibre extrusion process, thousands of extremely fine, continuous filaments are produced, which pass through a DuPont patented “pre-stretch” stage.
  8. 8. DuPont™ Typar® SF • These fine but tough filaments are then laid down producing an isotropic fibre web sheet which is then thermally bonded.
  9. 9. DuPont™ Typar® SF Versus Thermally Bonded • Higher uniformity • Higher elongation • Higher initial modulus
  10. 10. DuPont™ Typar® SF Versus Needlepunched • Lighter and thinner • Higher initial modulus • Higher damage resistance • Higher filtration properties • Decrease of transport and stocking costs • Easier installation • Do not to soak or to freeze ‘cause of precompressed structure
  11. 11. DuPont™ Typar® SF “Protection”
  12. 12. Advantages of DuPont™ Typar® SF • Easy to handle – Easy to carry – Easy to cut • Easy to install • Simplified in logistics – Pre-compressed • Large choice of dimensions
  13. 13. Application Areas of DuPont™ Typar® SF • Blanket drains in roads and sports fields • Temporary roads, access roads, forest roads • Permanent roads, airport runways
  14. 14. Application Areas of DuPont Typar SF • taxiways, motorways • Car parks, storage yards • Agricultural and pipe drains • erosion control of earth dam • river and lake embankments
  15. 15. DuPont™ Typar® SF Styles
  16. 16. REFERENCES • A. Watn, G. Eiksund, A. Knutson, Deformations and Damage of Non-Woven Geotextiles in Road Construction, 1998 • http://www.ehow.com/info_7790694_importance-geotextile- materials-road-construction.html • http://www.fibertex.com/en-GB/business- areas/Geotextiles/Design/Pages/RoadConstruction.aspx • Technical Handbook of DuPont™ Typar® SF
  17. 17. THANK YOU FOR YOUR ATTENTION

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