geosynthetic materials

7/29/2019 geosynthetic materials

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ASeminar

on

Geosynthetic Materials And Their Applications

In Transportation Engineering

Presented by

Shakti Dubey

M.tech. 1st sem

Sch.no.122111502

Maulana Azad Institute of Technology Bhopal- 462051

Department of Civil Engineering


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Content

What is geosynthetic

Polymers used in geosynthetics

Various functions of geosynthetics Classification of geosyntheics

Area of applications

Geosynthetics Standards Conclusion


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What is geosynthetics

geosynthetics are human made materialsused in

civil engineering to enhance, augment and makepossible cost transportational and geotechnicalconstruction projects.

These are planner or three dimensional productstypically made from petrochemical based polymers(plastics)

these are biologically inert. and most of them are

also chemically inert.


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Polymers used in geosynthetics

Chemically linked large molecules of carbon atomswith hydrogen or other atoms attached

Polypropylene

Polyethylene

Polyester

Polyamide

Polystyrene

Poly Vinyl Chloride

PP/Polyester /PE Geosynthetics Most widely usedacross the Globe (more than 95 percent)


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Functions of geosynthetics

Reinforcement

Separation

Drainage

Filtration

Containment

Fluid barrier

Protection

Frictional inter layer


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Reinforcement

1.Lateral restraint

2.Modified failure surface 3.Tentioned membrane


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Separation


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Drainage


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Filtration


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Containment


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Types of geosythetics

1. Geotextiles

2.Geogrids

3.Geonets

4.Geomembranes

5.Geosynthetic clay liners

6.Geocells/geo web members

7.Geofoam

8.Geocomposites


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Geotextiles

Woven Geotextile Nonwoven Geotextile


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Geogrids

Uniaxle Geogrid Biaxial Geogrid


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Geonet Geomembrane

Biplanar geonet

Triplanar geonet


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Geoclay liners

Geocells Geofoam


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Geocomposite


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Types Of

GeosyntheticsSeparation Reinforcement Filteration Drainage Containment

Geotextile YES YES YES YES

Geogrid YES

Geonet YES

Geomembrane YES

GCL YES

Geofoam YES

Geocomposites YES YES YES YES YES

FUNCTION OF GEOSYNTHETIC MATERIALS:

A Comparative Review.


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Applications In Transportation Engineering Roads: Reinforcement, stabilization, separation, drainage, filtration and

sealing are all roles for geosynthetics in road construction.

Asphalt Reinforcement: Asphalt is the proven material for roadconstruction, airport runways, take-off and landing strips. Damage causedby temperature fluctuations and vehicle loadings, for example reflectioncracking, can also occur in new asphalt layers. Asphalt has a low tensilestrength which can be exceeded even at quite small strains, leading to theformation of cracks.

Railways: Geosynthetics are finding a broad range of uses in railwayconstruction. Well thought out concepts and designs provide permanentanswers to technically demanding construction.

Airport: The high safety requirements of the air transport industry placesgreat demands on men, materials and technology. The heavy loads on

airport runways, take-off and landing strips require safe andlanding stripsrequire safe and reliable technical solutions. Geosynthetics contribute inmany different ways to the safety of air travel.


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Geo-synthetics Standards

ASTM Standards ISO standards (ISO/TC221) Indian standards (BIS) AASHTO standards FHWA standards NORDIC guidelines British Standards International Geosynthetic Society standards (IGS) Geosynthetic Research Institute (GRI) Geosynthetic Materials Association (GMA) US Provinvcial standards

Industrial Fabrics Association International (IFAI) Geo-synthetica International Erosion Control Association (IECA) European Center For Standardization (CEN)


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Conclusion

Extensive awareness should be created among

the civil engineers about the application of

geosynthetics.

Geosynthetics are effective tools in the hands

of the civil engineer that have proved to solve

a myriad of geotechnical problems.

To explore the potential of geosynthetics

more researches are needed in this field.


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References

Handbook ofGeosynthetics Geosynthetic Materials Association(GMA)January 2002 website: www.gmanow.com

VICTOR C, LI,(18 Nov 2000)Large Volume, High-Performance Applications

of Fibers in CivilEngineering, accepted 18 November 2000 Published

online.

Agrawal,BipinJ GEOTEXTILE: ITS APPLICATION TO CIVIL ENGINEEERING.

Lance Brown(May 2006)GEOSYNTHETIC MATERIALS What Are They? How

Are They Used?.

Website: www.geofabrics.com .

Erickson,Hans and Drescher,Andrew (Jan2001) The Use ofGeosynthetics toReinforce Low Volume Roads.
http://www.gmanow.com/http://www.geofabrics.com/http://www.geofabrics.com/http://www.gmanow.com/


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Thankyou

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