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GEOSYNTHETICS IN ROAD CONSTRUCTION

GEOSYNTHETICS IN ROAD CONSTRUCTION. S.Jaswant Kumar Chief General Manager (Planning and Quality) National Highways Authority Of India. Introduction Geosynthetic - Overview Geosynthetics Applications Impediments Suggestions. Geosynthetics. Modern civil engineering construction materials

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GEOSYNTHETICS IN ROAD CONSTRUCTION

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  1. GEOSYNTHETICS IN ROAD CONSTRUCTION S.Jaswant Kumar Chief General Manager (Planning and Quality) National Highways Authority Of India

  2. Introduction Geosynthetic-OverviewGeosynthetics ApplicationsImpedimentsSuggestions

  3. Geosynthetics • Modern civil engineering construction materials • Modify/Improve soil/geologic material behaviour • Developed/Synthesized for specific function or application in construction • More than 1billion sq m annual use

  4. Geosynthetics –The wide variety • Geotextiles –Woven, non-woven Filter fabrics • Geogrids • Geomembranes • Geocomposites • Geonets, Geofibres,mesh mattings, Geopipes, Geotubes.

  5. Woven or Knitted Geotextiles

  6. Non-woven Geotextile

  7. Uniaxial Geogrid

  8. BIAXIAL GEO GRID

  9. Woven or Welded Geogrids

  10. Geonets

  11. Geocomposites

  12. Geosynthetics – composition • Polypropylene • H D P E • Polyester • PVC • Synthetic Rubber • Natural fibres – Jute, coir

  13. COIR GEOTEXTILES

  14. Geosynthetics – the functions • Separation • Drainage • Filtration • Reinforcement • Moisture barrier • Cushion

  15. Separation function

  16. Drainage function

  17. Filtration function

  18. Reinforcement function

  19. REINFORCEMENT FUNCTION

  20. Geomembrane Seepage Barrier

  21. Lateral Restraint

  22. Bearing Capacity Increase

  23. Membrane Tension Support

  24. GEOCELL MATRESS UNDER EMBANKMENT ON SOFT SOIL

  25. Geocell in the making

  26. Geotextile wrapping of Geocell

  27. Concrete Facia Panels for GRS Wall

  28. Erosion Control Blanket

  29. Design Requirements for Asphalt Pavements

  30. Grid Locations for Asphalt reinforcement

  31. Reflection Cracking • Locate near to existing discontinuity • Mechanistic design method still evolving • Stiff geogrid best • Geotextile can waterproof

  32. Rutting in Overlays • Locate where strains are largest; mid-depth • Increase in life to critical rut of three times • Requires stiff geogrid

  33. GLASS GRID UNDER OVER LAY

  34. ROAD WIDENING Overlay GLASS GRID bitumen emulsion layer ROAD WIDENING

  35. Other Applications in Highways • Geosynthetic Reinforced Soil Walls • Reinforced soil slopes • Subsurface Drainage systems-trench drains, strip drains • Stabilising canal road systems in expansive soil regions. • PVD.

  36. Geosynthetic Reinforced Soil Wall

  37. Geosynthetic Band drains

  38. Impediments • Most of the Geosynthetics are imported. • Test Methodology they adopt is from country of origin. Test could be of:- • International standards (ISO TC221 Geosynthetics). • European Standards (CFN TC Geosynthetics). • German Standards DIN textiles norms. • British Standards BS • American Standards ASTM. • Very few Indian Standards.

  39. specifications • Specifications are from international organizations. • AASHO. • British Textile Technology Group - BTTG. • DGGT- EBGEO, Germany. • Geosynthetics Research Institute, USA Presence of large number of test methods & specifications are a matter of concern and confusion.

  40. Need for Testing • Index Testing-Basic Properties of Products • Quality control tests- Rapid testing to assure continuity of equality. • Performance testing- Testing of Geosynthetics in contact with soil under standard conditions in the lab to provide better simulation of site conditions. Also in full scale on site.

  41. R&D FACILITIES • Available R&D facilities:- • IITs, Delhi, Chennai, Mumbai. • BTRA • CRRI • CCRI, Coir Board • SASMIRA • Manufacturers Lab.

  42. R&D FACILITIES The existing Labs may have excellent facilities but • May not necessarily have all relevant facilities for test house. • May not maintain ambient temperature and humidity as required by ISO (21± 2°C &65%). • May not have necessary Grips for all varieties of Geosynthetics. • May not have skilled/Trained Technicians. • Not accredited.

  43. SUGGESTIONS • Need for establishing national organisation to address the problems. Role:- • Functions as a Geosynthetics test house. • QC checking at the place of manufacturer. • Property assessment of the product for the designer. • 3rd party quality control testing of product. • Testing & evaluation for product certifications. • Testing for R&D needs.

  44. SUGGESTIONS • Render advice to the industry & Govt. • Organise short refresher & training programs. • Develop laison with all specifying dept. like BIS, IRC & International institutions. • Immediate Standardization of specifications, test procedures. • Code on the lines of BS 8006.

  45. THANK YOU

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