Geo-textile
Geo-textile
Geo-textile is a part of
technical textile which is used for special purposes. Geo-textiles form one of
the two largest groups of Geo synthetics. The raw material of geo-textile comes
from polyester, Poly-amide, Polypropylene and Polyethylene. The application of
geo-textile is civil engineering, coastal engineering and also huge used of
construction site. Generally geo-textiles are located in the tension area to make stronger the soil.
Now I would like to discuss the classification of geo-textile.
The
Classification of Geo-textiles:
Geo-textile is divided by two
ways. They are-
1. According
to Time of Use
2. According
to Method of Production
1. According to Time of Use:
1st
Generation:
Geo-textile that were being manufactured for
another purpose, such carpet or industrial sacking, but later used for geo
technical purpose are known as 1st generation geo-textile.
2nd
Generation:
Geo-textile that were manufactured for certain
geo-technical purpose, but without adopting modern technology.
3rd
Generation:
Geo-textile that was
manufactured, designed, and produced to meet certain end use. It is actual
geo-textile.
2. According to Method of Production:
Woven:
These were produced in
various types of loom. However, these were categorized as lighter
geotextile and heavier geotextile.
Heat Bonded Non-woven:
These geotextiles
normally made from continuous filament fine fibers that has been laid randomly
onto a moving belt and passed through the heated roller system when a thin
sheet of textile is obtained.
Needle Punched Non-woven:
These types of
geo-textiles are made from a blended web of continuous or staple filament that
is passed through bank of maple reciprocating bearded needles. In case of
needle punched non-woven geotextile, the GSM can be found upto 2000 which is
too higher than heat bonded non-woven geo-textiles.
Knitted Geo-textiles:
Knitted
geotextiles are normally restricted to warp knitting. These are normally used
fine filtration, soil reinforcing grids etc.
RAW MATERIAL OF GEO-TEXTILE
1. Polyester
2. Poly-amide
3. Polypropylene
4. Polyethylene
THE BASIC PROPERTIES OF GEO-TEXTILE
The properties of polymer material are affected by its average
molecular weight (MW ) and its statistical distribution. Increasing the average
MW results in increasing:
·
tensile strength
·
elongation
·
impact strength
·
stress crack resistance
·
heat resistance
Narrowing the molecular weight distribution results in:
·
increased impact strength
·
decreased stress crack
resistance
·
decreased process ability.
Increasing crystallinity results in:
·
increasing stiffness or
hardness
·
increasing heat
resistance
·
increasing tensile
strength
·
increasing modulus
·
increasing chemical
resistance
·
decreasing diffusive
permeability
·
decreasing elongation or
strain at failure
·
decreasing flexibility
·
decreasing impact
strength
·
decreasing stress crack
resistance
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