The document discusses geotextiles, which are permeable synthetic textile materials commonly made from polyester or polypropylene polymers. Geotextiles are used in construction applications such as road work, drainage, and coastal protection to increase soil stability, provide erosion control, and aid in drainage. They function by separating soils, filtering water, reinforcing soils, draining water, protecting soils from erosion, relieving stress, and acting as moisture barriers. Common materials used include polypropylene and polyester. Geotextiles are formed through weaving or non-woven processes like needle punching or heat bonding.

1. Geotextiles
Mehedy Hasan
ID NO.: 13142107028
Dept. of Textile Eng.

2. Geotextiles
Geotextiles refers to a
permeable synthetic textile
material. Generally it is
produced from polyester or
polypropylene polymers.
Geotextiles are used to
increase soil stability, provide
erosion control or aid in
drainage.

3. History
In the 1920’s the state of South Carolina used a cotton textile to
reinforce the underlying materials on a road with poor quality soils.
R. J. Barrett in 1950’s used geotextiles behind precast concrete
seawalls, under precast concrete erosion control blocks, beneath
large stone riprap, and in other erosion control situations. He used
different styles of woven monofilament fabrics, all characterized by
a relatively high percentage open area (varying from 6 to 30%).
When synthetic fibers became more available in the 1960’s, textiles
were considered more seriously for roadway construction and
maintenance.

4. Applications
• Road work
• Construction
• Ground systems
• Drainage/Filtration
• Hydraulic works
• Waste disposal

5. Road works
Permanent road
Temporary road
Railways
Airports
Road widening
Parking areas

8. Construction
Foundation
When placed under foundations,
Geotextiles replace the blinding
layer. It is simply effective and
economical.
Concrete floors
Below concrete floors, the
permeable Geotextile protects the
drainage layer from contamination
from the concrete and the subsoil.

9. Impact
sound
suppression
In apartment buildings,
Geotextiles are used for sound
suppression purposes
Roofs
Geotextiles are used as sliding
layer, mechanical protection of
roof membranes and as filter
protections of any drainage layers.

10. Ground system
• Pipes and trenches
• Storage areas
• Sport grounds
• Slopes
***Storage areas with AM2
Bitumen-saturated Fibertex AM2
absorbs the stresses from cracks or
joints in the old surface, preventing
reflection through denisphalt composite
wearing courses.
• Here the Fibertex is a company
name which produces non-
woven geotextile, and Fibertex
AM2 is one of the product of
them.

11. Drainage system
Drainage pipes
• With permeable Geotextiles
wrapped around the pipes, an
effective and long lasting
drainage system is ensured,
without any risk of clogging.
Surface drains
• Surface drains are likely to become
silted up from the surrounding soil.
Geotextiles keep the fines separated
from the drainage layer ensuring the
effectiveness of the drain system

12. Drainage trenches
• Geotextiles protect the drain
system by preventing mingling
of fines.
Building drains
• In the construction of foundations and
basement walls, Geotextiles ensure a
clean and effective circumferential
drain, which e.g. prevents damage
caused by dampness.

13. Hydraulic
• Coastal protection
• Dams
• Harbor constructions
• River banks and canals
• Artificial lakes
• Water reservoirs

14. Coastal protection
• Geotextiles protect the coast
line as their flexibility and
permeability ensure
withstanding of the impact of
waves and currents, preventing
erosion and washing out of
fines.
Dams
• Artificial dams and
embankments need to be
fortified with strong materials
to resist the forces of nature.
Geotextiles stabilize and prevent
washing out of fines.

15. River banks and canals
• Geotextiles protect river banks
and canals in an effective and
environmentally friendly way.
Water reservoirs &
Artificial lakes
• Geotextiles protect the
waterproof membrane against
perforation.
• The waterproof membrane is
protected against perforation
with Geotextiles.

16. Coastal protection Dams
River banks and canals Water reservoirs & Artificial lakes

17. Materials used in geotextile
• polypropylene,
• polyester,
• polyethylene,
• polyamide (nylon),
• polyvinylidene chloride, and
• fiberglass.
Polypropylene and polyester are the mostly used. Sewing thread
for geotextiles is made from Kevlar or any of the above polymers.

18. Formation of geo textile
• Woven fabric
• Non-woven
i) Needle punching
ii) Heat bonding
iii) Resin bonding
iv) Combination bonding

19. Functions of geotextile
• Separation
• Filtration
• Soil reinforcement
• Drainage
• Protection
• Stress relieving
• Moisture Barrier

20. Separation
Separation is the process of
preventing two dissimilar
materials from mixing. Two
important criteria for selecting
a geotextile for separation are
permeability and strength. The
geotextile used for separation
must allow water to move
through it while retaining the
soil fines or sand particles.

21. Filtration
the equilibrium geotextile to soil system that allows for adequate
liquid flow with limited soil loss across the plane of geotextile over
a service lifetime

22. Reinforcement.
To provide reinforcement, a
geotextile must have sufficient
strength and embedment
length to resist the tensile
forces generated, and the
strength must be developed at
sufficiently small strains (i.e.
high modulus) to prevent
excessive movement of the
reinforced structure.

23. Drainage
a geotextile acts as a conduit for the
movement of liquids or gases in the
plane of the geotextile. Examples
are geotextiles used as wick drains
and blanket drains. The relatively
thick nonwoven geotextiles are the
products most commonly used.
Selection should be based on
transmissivity, which is the capacity
for in-plane flow.

24. Protection
In erosion control, the
geotextile protects soil
surfaces from the tractive
forces of moving water or
wind and rainfall erosion.
Geotextiles can be used in
ditch linings to protect
erodible fine sands or
cohesion less silts.

25. Moisture barrier
Both woven and nonwoven
geotextiles can serve as moisture
barriers when impregnated with
bituminous, rubber-bitumen, or
polymeric mixtures.

30. Thanks a lot.