geosynthetics in road construction

45
GEOSYNTHETICS IN GEOSYNTHETICS IN ROAD CONSTRUCTION ROAD CONSTRUCTION S.Jaswant Kumar S.Jaswant Kumar Chief General Manager (Planning and Chief General Manager (Planning and Quality) Quality) National Highways Authority Of India National Highways Authority Of India

Upload: salaam

Post on 19-Jan-2016

199 views

Category:

Documents


30 download

DESCRIPTION

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 - PowerPoint PPT Presentation

TRANSCRIPT

Page 1: GEOSYNTHETICS IN ROAD CONSTRUCTION

GEOSYNTHETICS IN GEOSYNTHETICS IN ROAD CONSTRUCTIONROAD CONSTRUCTION

S.Jaswant KumarS.Jaswant KumarChief General Manager (Planning and Quality)Chief General Manager (Planning and Quality)

National Highways Authority Of IndiaNational Highways Authority Of India

Page 2: GEOSYNTHETICS IN ROAD CONSTRUCTION

Introduction Introduction GeosyntheticGeosynthetic--OverviewOverviewGeosynthetics ApplicationsGeosynthetics ApplicationsImpedimentsImpedimentsSuggestions Suggestions

Page 3: GEOSYNTHETICS IN ROAD CONSTRUCTION

GeosyntheticsGeosynthetics

Modern civil engineering construction Modern civil engineering construction materialsmaterials

Modify/Improve soil/geologic material Modify/Improve soil/geologic material behaviourbehaviour

Developed/Synthesized for specific Developed/Synthesized for specific function or application in constructionfunction or application in construction

More than 1billion sq m annual useMore than 1billion sq m annual use

Page 4: GEOSYNTHETICS IN ROAD CONSTRUCTION

Geosynthetics –The wide varietyGeosynthetics –The wide variety

Geotextiles –Woven, non-woven Filter Geotextiles –Woven, non-woven Filter fabricsfabrics

GeogridsGeogrids GeomembranesGeomembranes GeocompositesGeocomposites Geonets, Geofibres,mesh mattings, Geonets, Geofibres,mesh mattings,

Geopipes, Geotubes.Geopipes, Geotubes.

Page 5: GEOSYNTHETICS IN ROAD CONSTRUCTION

Woven or Knitted GeotextilesWoven or Knitted Geotextiles

Page 6: GEOSYNTHETICS IN ROAD CONSTRUCTION

Non-woven GeotextileNon-woven Geotextile

Page 7: GEOSYNTHETICS IN ROAD CONSTRUCTION

Uniaxial GeogridUniaxial Geogrid

Page 8: GEOSYNTHETICS IN ROAD CONSTRUCTION

BIAXIAL GEO GRIDBIAXIAL GEO GRID

Page 9: GEOSYNTHETICS IN ROAD CONSTRUCTION

Woven or Welded GeogridsWoven or Welded Geogrids

Page 10: GEOSYNTHETICS IN ROAD CONSTRUCTION

GeonetsGeonets

Page 11: GEOSYNTHETICS IN ROAD CONSTRUCTION

GeocompositesGeocomposites

Page 12: GEOSYNTHETICS IN ROAD CONSTRUCTION

Geosynthetics – compositionGeosynthetics – composition

PolypropylenePolypropylene H D P EH D P E PolyesterPolyester PVCPVC Synthetic RubberSynthetic Rubber Natural fibres – Jute, coirNatural fibres – Jute, coir

Page 13: GEOSYNTHETICS IN ROAD CONSTRUCTION

COIR GEOTEXTILESCOIR GEOTEXTILES

Page 14: GEOSYNTHETICS IN ROAD CONSTRUCTION

Geosynthetics – the functionsGeosynthetics – the functions

SeparationSeparation DrainageDrainage FiltrationFiltration ReinforcementReinforcement Moisture barrierMoisture barrier CushionCushion

Page 15: GEOSYNTHETICS IN ROAD CONSTRUCTION

Separation functionSeparation function

Page 16: GEOSYNTHETICS IN ROAD CONSTRUCTION

Drainage functionDrainage function

Page 17: GEOSYNTHETICS IN ROAD CONSTRUCTION

Filtration functionFiltration function

Page 18: GEOSYNTHETICS IN ROAD CONSTRUCTION

Reinforcement functionReinforcement function

Page 19: GEOSYNTHETICS IN ROAD CONSTRUCTION

REINFORCEMENT FUNCTION

Page 20: GEOSYNTHETICS IN ROAD CONSTRUCTION

Geomembrane Seepage BarrierGeomembrane Seepage Barrier

Page 21: GEOSYNTHETICS IN ROAD CONSTRUCTION

Lateral Restraint

Page 22: GEOSYNTHETICS IN ROAD CONSTRUCTION

Bearing Capacity Increase

Page 23: GEOSYNTHETICS IN ROAD CONSTRUCTION

Membrane Tension Support

Page 24: GEOSYNTHETICS IN ROAD CONSTRUCTION

GEOCELL MATRESS UNDER EMBANKMENT ON SOFT SOIL

Page 25: GEOSYNTHETICS IN ROAD CONSTRUCTION

Geocell in the makingGeocell in the making

Page 26: GEOSYNTHETICS IN ROAD CONSTRUCTION

Geotextile wrapping of GeocellGeotextile wrapping of Geocell

Page 27: GEOSYNTHETICS IN ROAD CONSTRUCTION

Concrete Facia Panels for GRS Concrete Facia Panels for GRS WallWall

Page 28: GEOSYNTHETICS IN ROAD CONSTRUCTION

Erosion Control BlanketErosion Control Blanket

Page 29: GEOSYNTHETICS IN ROAD CONSTRUCTION

Design Requirements for Design Requirements for Asphalt PavementsAsphalt Pavements

Page 30: GEOSYNTHETICS IN ROAD CONSTRUCTION

Grid Locations for Asphalt Grid Locations for Asphalt reinforcementreinforcement

Page 31: GEOSYNTHETICS IN ROAD CONSTRUCTION

Reflection CrackingReflection Cracking

Locate near to Locate near to existing discontinuityexisting discontinuity

Mechanistic design Mechanistic design method still evolvingmethod still evolving

Stiff geogrid bestStiff geogrid best Geotextile can Geotextile can

waterproofwaterproof

Page 32: GEOSYNTHETICS IN ROAD CONSTRUCTION

Rutting in OverlaysRutting in Overlays

Locate where Locate where strains are largest; strains are largest; mid-depthmid-depth

Increase in life to Increase in life to critical rut of three critical rut of three timestimes

Requires stiff Requires stiff geogridgeogrid

Page 33: GEOSYNTHETICS IN ROAD CONSTRUCTION

GLASS GRID UNDER OVER LAYGLASS GRID UNDER OVER LAY

Page 34: GEOSYNTHETICS IN ROAD CONSTRUCTION

ROAD WIDENINGROAD WIDENING

bitumen emulsion layer

GLASS GRID

Overlay

ROAD WIDENING

Page 35: GEOSYNTHETICS IN ROAD CONSTRUCTION

Other Applications in HighwaysOther Applications in Highways

Geosynthetic Reinforced Soil WallsGeosynthetic Reinforced Soil Walls Reinforced soil slopesReinforced soil slopes Subsurface Drainage systems-trench Subsurface Drainage systems-trench

drains, strip drainsdrains, strip drains Stabilising canal road systems in Stabilising canal road systems in

expansive soil regions.expansive soil regions. PVD. PVD.

Page 36: GEOSYNTHETICS IN ROAD CONSTRUCTION

Geosynthetic Reinforced Soil Geosynthetic Reinforced Soil WallWall

Page 37: GEOSYNTHETICS IN ROAD CONSTRUCTION

Geosynthetic Band drains

Page 38: GEOSYNTHETICS IN ROAD CONSTRUCTION

Impediments Impediments

Most of the Geosynthetics are imported.Most of the Geosynthetics are imported. Test Methodology they adopt is from country of Test Methodology they adopt is from country of

origin.origin. Test could be of:-Test could be of:- International standards (ISO TC221 Geosynthetics).International standards (ISO TC221 Geosynthetics). European Standards (CFN TC Geosynthetics).European Standards (CFN TC Geosynthetics). German Standards DIN textiles norms.German Standards DIN textiles norms. British Standards BSBritish Standards BS American Standards ASTM.American Standards ASTM. Very few Indian Standards.Very few Indian Standards.

Page 39: GEOSYNTHETICS IN ROAD CONSTRUCTION

specificationsspecifications

Specifications are from international Specifications are from international organizations.organizations.

AASHO.AASHO. British Textile Technology Group - BTTG.British Textile Technology Group - BTTG. DGGT- EBGEO, Germany.DGGT- EBGEO, Germany. Geosynthetics Research Institute, USAGeosynthetics Research Institute, USA Presence of large number of test methods & Presence of large number of test methods &

specifications are a matter of concern and specifications are a matter of concern and confusion. confusion.

Page 40: GEOSYNTHETICS IN ROAD CONSTRUCTION

Need for TestingNeed for Testing

Index Testing-Basic Properties of ProductsIndex Testing-Basic Properties of Products Quality control tests- Rapid testing to Quality control tests- Rapid testing to

assure continuity of equality.assure continuity of equality. Performance testing- Testing of Performance testing- Testing of

Geosynthetics in contact with soil under Geosynthetics in contact with soil under standard conditions in the lab to provide standard conditions in the lab to provide better simulation of site conditions. Also in better simulation of site conditions. Also in full scale on site.full scale on site.

Page 41: GEOSYNTHETICS IN ROAD CONSTRUCTION

R&D FACILITIESR&D FACILITIES

Available R&D facilities:-Available R&D facilities:- IITs, Delhi, Chennai, Mumbai.IITs, Delhi, Chennai, Mumbai. BTRABTRA CRRICRRI CCRI, Coir BoardCCRI, Coir Board SASMIRASASMIRA Manufacturers Lab.Manufacturers Lab.

Page 42: GEOSYNTHETICS IN ROAD CONSTRUCTION

R&D FACILITIESR&D FACILITIES

The existing Labs may have excellent facilities The existing Labs may have excellent facilities butbut

May not necessarily have all relevant May not necessarily have all relevant facilities for test house.facilities for test house.

May not maintain ambient temperature and May not maintain ambient temperature and humidity as required by ISO (21± 2°humidity as required by ISO (21± 2°CC &65%). &65%).

May not have necessary Grips for all varieties May not have necessary Grips for all varieties of Geosynthetics.of Geosynthetics.

May not have skilled/Trained Technicians.May not have skilled/Trained Technicians. Not accredited.Not accredited.

Page 43: GEOSYNTHETICS IN ROAD CONSTRUCTION

SUGGESTIONSSUGGESTIONS Need for establishing national organisation to Need for establishing national organisation to

address the problems.address the problems.Role:-Role:-1)1) Functions as a Geosynthetics test house.Functions as a Geosynthetics test house.i.i. QC checking at the place of manufacturer.QC checking at the place of manufacturer.ii.ii. Property assessment of the product for the Property assessment of the product for the

designer. designer. iii.iii. 33rdrd party quality control testing of product. party quality control testing of product.iv.iv. Testing & evaluation for product certifications.Testing & evaluation for product certifications.v.v. Testing for R&D needs.Testing for R&D needs.

Page 44: GEOSYNTHETICS IN ROAD CONSTRUCTION

SUGGESTIONSSUGGESTIONS

2)2) Render advice to the industry & Govt.Render advice to the industry & Govt.

3)3) Organise short refresher & training Organise short refresher & training programs.programs.

4)4) Develop laison with all specifying dept. Develop laison with all specifying dept. like BIS, IRC & International institutions.like BIS, IRC & International institutions.

Immediate Standardization of Immediate Standardization of specifications, test procedures.specifications, test procedures.

Code on the lines of BS 8006.Code on the lines of BS 8006.

Page 45: GEOSYNTHETICS IN ROAD CONSTRUCTION

THANK YOU