Coir geotextiles are currently used in erosion control
measures such as growing of vegetation on highway shoulders and embankments
and also in protecting the banks of lakes, canals and rivers.
Coir geotextiles give maximum protection to the soil until
the grass takes root and provides a permanent coverage. After the stabilization
of soil, the nettings decompose gradually and provide nourishment to grass
growing on the soil medium. The netting gives plenty of room to grow and
at the same time provide a large number of check daks.
The accuracy of Coir geotextiles, with a density of 500g/m2, in
reducing the water velocity and soil loss is reported to be 77% and 98.4%
respectively relative to bare soil conditions (cammack-1988). Schurholz
1988 reports that coir retained about 20% of its strength after one year
in incubator test with soil at 28-30ά c and 90% humidity whereas jute
biodegraded fully after eight weeks.
Coir geotextiles can be used either as an overlay or an
interlay the former protecting the surface from run-off and the latter
performing the functions of separation, filtration and drainage. Soil
bio engineering with Coir geotextiles finds effective application
in the following situations:
- Water course protection including stream bank protection
- Shoreline stabilization
- Storm water channels
- Slope stabilization in railway cutting and embankments
- Water course protection
- Separation application in rural roads, railways, parking
and storage areas
- Reinforcement of rural unpaved roads, temporary walls
Providing sub base layer in road pavement
- Filtration in road drains and land reclamation
- Containment of soil and concrete as temporary seeding
- Concrete column curing
- Fly ash dump waste protection and greening Forestry
- Highway cut and fill slopes
- Control of shallow mass waste and gully erosion
- As sound barrier
- UV protection for under earth crops
- Roof top greening
- Protection from wind erosion
- Storm shuttering
- Agricultural and horticultural applications like mulching,
antiweed, vegetative water channels
- High traffic areas
- Mine site reclamation
- High altitude ski slopes
- Dune rehabilitation Wetland environments
- Plant and tree protective systems
- Agri and Horti engineering industry
- Mud wall reinforcement
- Soil stabilization.
Coir nettings with tensile strength and the friction between
coir and soil is adequate to justify its application for use in slope
stability problems and helps development of shear surface and thus enables
greater heights of fill to be built than would otherwise be possible.
Coir sub base layer in Road pavements
The use of closely knitted Coir geotextiles as an
interface between the sub grade and the sub base increases the strength
of the pavement and prevents intermingling of the soil and the granular
sub base and improves drainage. Coir net also acts as a support membrane
and reduces localized distress to the road surface by redistributing traffic
loads over a wider area of the road surface. Figures show the suggested
pavement with coir fabric.
Unique advantage of coir geotextiles when compared to
other natural fibers is that frequency of watering can be reduced due
to its high water retention capacity (can hold 3 times its own weight).
cut fibre: the small fibre bit which
is waste during the sieving of coir dust is used as growing media in the
horticulture and floral gardens.
basket and poles: the combination
of soak and grow and the liner gives maximum moisture retention for your
liners: all wall mounted baskets come
with rubberised coir liner and universal wall mount. The wall mount is
also ideal for attaching the basket to fencing without the need for drilling
chips: dried husk are cut into various
small, medium, large size mixed with charcoal and firewood and used as
hot mixture for orchid and anthurieum plantations.
advantages of MAXIMA Coir Geotextiles
Faster binding of soil
Excellent air and water permeability
Enough sunlight passes through
Holds the seeds and saplings in place
High water retaining capacity
Excellent medium for quick vegetation
Degrades over a period of time (2.5
to 6 years)
Allows for deep rooting of plants
and provides nutrients.
Easy to install and follows the contour
of the soil surface.
Eco-friendly and nonpolluting.
The unique properties of coconut fiber and Coir
geotextiles to absorb water and degrade with time give it a definite edge
over synthetic geotextiles in various applications. The use of geotextiles
during the past three decades has increased from 10.2 million Square.
Meter is 1970 to 1400 million square meter in 2000. But the Geotextiles
made out of natural fiber account for only 0.001%. The rest is enjoyed
by plastic materials!! The major drawback in coir Geotextile industry
is non availability of proper specifications/procedure as well as that
of well documented scientific field studies.
Techniques of MAXIMA Geotextiles
The first step in the application of Coir Geotextiles
is to make a detailed study of the sites; Slope assessment, nature and
consistency of the soil cover, the extent of damage, rainfall patterns
etc. to make the right and relevant choice of Coir geotextiles for the
site, as well as the seeds or saplings. Site preparation and laying procedure
The ground has to be prepared by removing protruding stones,
earth masses etc. The surface must be made relatively free of weeds,
stones, roots, sticks, rivulets, gullies, crusting and caking.
After preparing the soil surface, the seeds have to be
applied on the surface by hand broadcasting or by hydraulic means and
the blanket/mat must be laid over the seeds almost immediately.
The seeds/plants have to be obtained depending on the
climatic conditions, preferably the local species as per clients instructions.
The seeds after germination should take up deep rooting system. The seeds
should match the soil conditions to get optimum germination, root development,
vegetation density and longevity.
The erosion control blankets are to be laid in the direction
of the water flow starting from the top to the bottom. The top portion
has to be anchored in a cut trench and stapled or spiked to fix properly.
Similar procedure has to be followed at the bottom of the slope also for
best results. The blankets may be anchored with 11 gauge wire staples,
of size 8 x 2 x 8 (U shaped) One or two doses of sprinkling is recommended
if the weather is hot and dry. For the first few days, the moisture levels
must be properly monitored to facilitate easy germination of the seeds.
The blanket will protect the slopes against rain water.
The vegetation will get established to protect the slopes permanently
and achieve greening effect on the surface.
Seeding/Planting Methods: Quick germination, sod forming, grass species must be
used whenever possible. While seeding/planting always match the seed/sapling
to be used with the local soil conditions for optimum results. Standard
seed broadcast methods are acceptable prior to erosion control blanket