Geotextiles


Geotextile is a porous and permittable textile material which is used in contact with rock, earth, soil and etc as an vital part of civil engineering projects and structures. It can be of naturally found substances like cotton, jute and coir. It can also be synthetic polymers like polyamide, polypropylene, polyethylene, and polyester.

Functions of Geotextiles

  • Sealing
  • Drainage
  • Reinforcement
  • Separation
  • Filtration

Sealing

 

Drainage/ Filtration/ Transitivity

Reinforcement

By giving lateral pressure through interfacial abrasion between soil and geotextile

Properties of Design

  • Burst power
  • Puncture strength
  • Permeability
  • Gab tensile power and enlongation
  • Dynamic puncture

Applications of Design

  • Drainage
  • Pavement overlays
  • Flexible paved road construction

 

  1. Flexible paved road construction

Fig: table showing prerequisites for roadways application

PROPERTY UNIT REQUIREMNTS
MODERATE HIGH
Puncture Strength N 400 700
Dynamic Puncture m 0.018 0.012
Ultimate elongation % >50 >50
Burst Strength Pa 2 3
Grab Strength N 700 800
Permeability m/s >Soil Permeability
Apparent Opening size m < .00015

 

 

  1. Pavement Overlays

Fig: Table showing Paving Fabric Requirements

PROPERTY UNITS REQUIREMENTS
Grab Strength N 450
Mass per Unit area Kg/m2 .140
Ultimate Elongation %` > 50
Melting point 0C 150

 

 

  1. Drainage

Fig: table showing prerequisites for drainage applications

Property Unit High survivability Moderate survivability
Puncture Strength N 690 420 260
Dynamic Puncture m .014 .018 .022
Burst Strength Pa 2757600 2068200 1275390
Elongation at break % 60 60 60

 

  • Geotextiles are competent, effective and economic technique of resolving most of the geotechnical tribulations in roadways.
  • The design engineer has to be well informed about the potential problems and must make use of this fairly new tool for resolving them.
  • For this he should comprehend the properties and abilities of geotextile matierial at disposal.