1. ROADWORKS
TE 552 Nonwoven Product
Development
Neslihan
Yagmur

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. Materials
• Polyethylene terephthalate (PET)
• Polypropylene (PP)

4. Methods
• Thermally bonded
• Needlepunched

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. DuPont™ Typar® SF

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. DuPont™ Typar® SF
• These fine but tough filaments are then laid
down producing an isotropic fibre web sheet
which is then thermally bonded.

9. DuPont™ Typar® SF Versus Thermally
Bonded
• Higher uniformity
• Higher elongation
• Higher initial modulus

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. DuPont™ Typar® SF “Protection”

13. 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

14. Application Areas of DuPont™ Typar® SF
• Blanket drains in roads and sports fields
• Temporary roads, access roads, forest roads
• Permanent roads, airport runways

15. 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

16. DuPont™ Typar® SF Styles

17. 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

18. THANK YOU FOR YOUR ATTENTION