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Department:textile engineering, City University Bangladesh, topic: Geo textile

  1. Technical textile Course code:TEX308 Topic: Geo textile
  2. Group member Supervisor  Anik deb ID : 11126269  Md.karimul Islam sagar ID: 11126200  Farooq ID:  Md.Abdul Ohab ID : 12129621  Md.Ariful Islam ID : 12129653  Md.Soliaman Sikder ID: 12129624  Md.Ebrahim Anwar ID: 12129557 Miss. Rabeya Islam Lecturer Department: Textile Engineering City University
  3. Overview:  Background of Geotextile.  Initial Consideration.  Typical Geosynthetic materials.  Raw materials of Geotextiles.  Basic properties of Geotextiles.  Function of Geotextiles.  Various types of Geotextiles & Application.  Conclusion & Recommendation.
  4. Background of Geo textiles: The prefix of geotextile, geo, means earth and the ‘textile’ means fabric. Therefore, the geotextile is defined as follows:"A permeable geosynthetic comprised solely of textiles.  First applications of geotextiles were woven industrial fabrics used in 1950’s. One of the earliest documented cases was a waterfront structure built in Florida in 1958.  The first nonwoven geotextile was developed in 1968 by the Rhone Poulence company in France. which was used in dam construction in France during 1970.
  5. Initial consideration: There are a number of factors that will help to determine the durability of a geotextile: Physical structure of the fabric Nature of the polymer used Quality and consistency of the manufacturing process, Physical and chemical environment in which the product is placed, Condition in which the product is stored
  6.  Typical geosynthetic materials:  Geogrids  Geonets  Geotextiles  Geomembranes  Geosynthetic Clay Liners  Geopipe  Geocomposites
  7. Raw materials of Geotextile: The four main polymer families most widely used as the raw material for geotextiles are:  Polyester  Polyamide  Polypropylene  Polyethylene
  8. Basic properties of Geotextile:  Tensile strength  Elongation  Impact strength  Stress crack resistance  Heat resistance  increasing stiffness or hardness  increasing chemical resistance
  9.  Separation: Separation function is defined as “The preventing from intermixing of adjacent dissimilar soils and/or fill materials by the use of a geo textile.Geotextiles function to prevent mutual mixing between 2 layers of soil having different particle sizes or different properties.
  10. Drainage: Drainage function is defined as The collecting and transporting of precipitation, ground water and/or other fluids in the plane of the geo textile. In drainage system, geo textiles are used to flow water over the plane surface of the soil with minimum pressure of the water over soil.
  11. Filtration: Filtration function is defined as The restraining of soil or other particles subjected to hydrodynamic forces while allowing the passage of fluids into or across a geo textile.Filtration involves the establishment of a stable interface between the drain and the surrounding soil.
  12. Reinforcement : Reinforcement function is defined as The use of the stress- strain behavior of a geo textile or a geo textile-related product to improve the mechanical properties of soil or other construction materials.
  13. Protection: protection function is defined as The prevention or limiting of local damage to a given element or material by the use of a geo textile. Waste disposal system and tunnel constructions are also depends on geo textiles.
  14. Three main types of Geotextile: Fig.: Non-woven geotextile fabrics. Fig: Woven geotextile fabrics. Fig: Specialty Geotextile fabrics .
  15. Main Application of Geotextiles:
  16. ir  Roads and other trafficked areas  railways  Earthworks, foundations and retaining structures  drainage systems  Erosion control works  Reservoirs and dams:  Canals - Intended uses  Tunnels and underground structures  Solid waste disposal  Liquid waste disposal
  17. Various types of Geotextiles: Woven Geotextiles: Woven Geotextiles are made from weaving monofilament, multifilament yarns, They have high tensile strength and low elongation properties. Applications:  Separator cum reinforcement for paved/unpaved roads  Track-bed stabilization  Hard standages  Slit-fence  Basal reinforcement of embankments on soft ground  Area stabilization  Sub grade stabilization  Reinforced soil steep slopes  Filters for hard armour erosion control systems  Geotextile tubes
  18. Classifications of woven Geotextiles:  TerraTex Woven Geotextiles  Woven Monofilament Geotextiles  Polypropylene Woven Slit Film Geotextile  Polyester Woven Multifilament Geotextile  Polypropylene Woven Multifilament Geotextile  Woven Reinforcement Geotextiles  Woven Stabilization and Separation Geotextiles  Woven Filtration Geotextiles.
  19. Nonwoven geotextile: Advantages of using nonwovens: Elasticity Permeability Low humidity Absorption Resistance to rotting, chemicals, bacteria and fungi. Lightweight Temperature fluctuation tolerant Stress-relieving Some examples of where nonwovens are used Road and rail building Dam, canal and pond lining Hydraulic works Sewer lines Soil stabilization and reinforcement Soil separation Drainage Landfill Filtration
  20. Classification of Nonwoven Geotextile:  Light Weight Nonwoven Geotextiles.  Medium weight nonwoven geotextile.  Heavy weight nonwoven Geotextiles.  Spun bond nonwoven Geotextiles.  Three main types of Geotextile.
  21. Classification of specialty Geotextiles: Aero modeling Geotextile: Cost Effective & Adaptable Tough Surface Easy To Repair Simple to Install Marine Recovery Geotextile: Environmentally Friendly Catch Paint Chips Cleaner & Safer Pads Polyurea Geotextiles: polyurea geotextiles are specifically manufactured to perform at the highest level when sprayed with polyurea.
  22. Jute Geotextiles: Jute Geotextile is much cheaper than synthetic fiber.  It is easy to blend with other natural material and synthetic fibers. Jute Geotextile is environmental friendly, biodegradable, hydrophobic, anionic and locally available materials.  Initially it has got the high strength and non-hazardous properties.  It is also a renewable source of energy as natural biomass
  23. Conclusions and recommendations: Detailed investigations into the German practice of using nonwoven geotextiles as an interlayer between cementations layers in concrete pavements resulted in the development of U.S. material specifications and construction standards. Currently in the U.S., nonwoven geotextiles are not commonly used in concrete pavements as an interlayer between cementations layers. The German experience, however, offers more than 25 years of working with this process and has demonstrated that it offers improvements if done properly. Drawing on German expertise, and incorporating U.S. innovation, the FHWA hopes to prove the processes right by promoting this innovative practice and encouraging contractors to try it for themselves.