Construct with Geo-textiles
Construct with Geo-textiles
Geo-textiles
Geo-textiles are a
permeable synthetic material made of textile materials. They are usually made
from polymers such as polyester or polypropylene. The Geo-textiles are further
prepared in three different categories – woven fabrics, non-woven fabrics and
knitted fabrics.
TYPES
OF GEOTEXTILES
Woven
fabrics: Large numbers of geosynthetics are of woven type,
which can be sub-divided into several categories based upon their method of
manufacture. These were the first to be developed from the synthetic fibers. As
their name implies, they are manufactured by adopting techniques which are
similar to weaving usual clothing textiles. This type has the characteristic
appearance of two sets of parallel threads or yarns. the yarn running along the
length is called warp and the one perpendicular is called weft.
The
majority of low to medium strength woven geo synthetics are manufactured from
polypropylene which can be in the form of extruded tape, silt film,
monofilament or multifilament. Often a combination of yarn types is used in the
warp and weft directions to optimize the performance/cost. Higher permeability
is obtained with monofilament and multifilament than with flat construction
only yarns --.the yarn running along the length is called warp and the one
perpendicular is called weft.
Non-woven: Non woven geosynthetics can be manufactured from
either short staple fibre or continuous filament yarn. The fibers can be bonded
together by adopting thermal, chemical or mechanical techniques or a
combination of techniques. The type of fibre (staple or continuous) used has
very little effect on the properties of the non-woven geosynthetics. Non-woven
geotextiles are manufactured through a process of mechanical interlocking or
chemical or thermal bonding of fibres/filaments. Thermally bonded non-wovens
contain wide range of opening sizes and a typical thickness of about 0.5-1 mm
while chemically bonded non-wovens are comparatively thick usually in the order
of 3 mm. On the other hand, mechanically bonded non-wovens have a typical
thickness in the range of 2-5 mm and also tend to be comparatively heavy
because a large quantity of polymer filament is required to provide sufficient
number of entangled filament cross wires for adequate bonding.
Knitted fabrics:
Knitted geosynthetics are manufactured using another process which is adopted
from the clothing textiles industry, namely that of knitting. In this process
interlocking a series of loops of yarn together is made. An example of a
knitted fabric is illustrated in figure. Only a very few knitted types are
produced. All of the knitted geosynthetics are formed by using the knitting
technique in conjunction with some other method of geosynthetics manufacture,
such as weaving.
Fibertex
provides the following Functions of Geo-textiles.
Separation
is
the basic use of Geo-textiles and is widely practiced in road works and railway constructions.
·
Filtration
Geo-textiles are widely used for filtration in road works and railway
constructions as well as coastal protection.
Protection
Geo-textiles
widely used for protection in waste disposal systems and tunnel constructions
to ensure the integrity of a sealing material (for example Geo-membrane) when
fill material and/or loads are applied.
· Reinforcement
The mechanical and hydraulic properties of fibertex Geo-textiles make them
together with geogrid, Ideal for soil reinforcement and retaining walls.
Reinforcement with appropriate fibertex product prevents vertical soil walls
and slopes from collapsing.
Stress
Relieving Fibertex offers a flexible pre-compressed 150g/m2 pp
non-woven thermal bonding on one side only designed especially for stress
relieving.
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