Transcript Document

Jute Geo-Textiles
Road Construction
with Jute Geotextiles (JGT)
A NATIONAL JUTE BOARD
PRESENTATION
Presenter-T Sanyal
Chief Consultant, National Jute Board
Jute Geo-Textiles
What are Geotextiles?



Geotextiles- more aptly Geosynthetics –belong to the
class of Technical Textiles under GEOTECH category.
Geotextiles are generically of two varieties—one
variety is made of synthetic polymers (petrochemical
derivatives) and the other of natural fibres (such as
jute, coir)
Geotextiles are intended to improve engineering
performance of soil on or in which it is laid
Jute Geo-Textiles
Jute Geotextiles
• Jute Geotextiles (JGT)-as the name suggests –is made of
bast fibres of jute plants—a renewable agri-resource under
cultivation in the Ganga-Brahmaputra delta for centuries.
Presently under cultivation in other areas/countries as well
• The British were the first to discover the potential of jute fibre
for flexible packaging (sacks) after elaborate tests
• The features of jute fibre conform to technical requirements
of geotextiles, besides its added advantage of being ecoconcordant, abundant availability, the back-up R & D support
and industry-expertise to make customized JGT
• Use of JGT helps reduce carbon foot-print in road
construction
Jute Geo-Textiles
USP OF JUTE

High moisture absorbing capacity

Excellent drapability (the best of all GTs)

High modulus

Low extension-at-break

High roughness co-efficient

Excellent spinnability

Bio-degradability with mulching & soil-nourishing properties

Annually renewable resource with abundant availability

Economical &

Eco-concordant
Jute Geo-Textiles
JGT - THE FORERUNNER OF MAN-MADE GT
Jute fabric was used in road construction
long before the concept of geotextiles
with man-made fibres emerged
Jute hessian was applied
successfully on Strand
Road at Kolkata as early
as in 1934 and in
Myanmar during the 2nd
World War
First concerted effort to
promote use of Jute
Geotextiles took off in
1980s with the support of
UNDP
Extensive R & D on JGT over the years have helped understand the
mechanism of its functioning and develop improved varieties for its
application in roads & other areas.
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JGT – Basic Functions
JGT matches its man-made counterpart in the three basic functions
of a geotextile viz Separation, Filtration, Drainage. Besides,

Along-plane drainage capability (i.e. transmissivity) of JGT is higher than its
man-made counterpart.

Fineness of jute fibre enables manufacture of JGT according to the specified
porometric features

High Roughness Co-efficient of jute ensures better load transference &
confining action on soil
JGT has far greater water absorbency than all other GTs –a quality which

enables sustained release of the absorbed water, thus creating a congenial
micro-climate for better growth of vegetation
Jute Geo-Textiles
Role of JGT in Filter-cake formation in soil
FILTER CAKE
FORMATION IN SOIL
IS AN OPTIMAL STATE OF
SOIL CONSOLIDATION
TRIGGERING GRADUAL
DEVELOPMENT OF
EFFECTIVE STRESS
WITHIN A SOIL MASS,
THUS ENABLING IT TO
BEAR GREATER LOAD.
Jute Geo-Textiles
Civil engineering Applications of JGT

Strengthening of road by improving CBR

Slope management

Protection of river bank against erosion

Stabilizing embankments

Prevention of railway track settlement

Consolidation of soft soil

Control of surface soil detachment
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1. JGT in Road Construction
Causes of failure of roads :

Inadequate pavement thickness

Higher-than-design traffic load & intensity

Low bearing capacity of sub grade

Intermixing of sub-base and sub grade

Insufficient drainage of surface and sub-surface water

Leading to “mud pumping”

Permeable wearing course
Besides the distress /failure of road pavement, stability of a road
also depends on the stability of the embankment on which it is
built and slope stability the causes of distress/failure of which are
different.
Jute Geo-Textiles
Design parameters
• Road pavements are usually designed on the
basis of traffic load & its intensity or
equivalent single axle load (ESAL), sub-grade
CBR and allowable rut-depth
• There are other design parameters followed
in some of the overseas countries. USA, for
instance, follows the concept of Structural
Number.
Jute Geo-Textiles
JGT in Road Construction
How can JGT help?

Enhances the CBR of the sub-grade by
-inducing membrane effect, exerting confining action on sub-grade,
preventing soil migration & facilitating water-dissipation along &
across its plane (essentially ‘filtration’ function) leading to generation
of effective stress within sub-grade
-preventing intermixing of sub-grade and sub-base (“separation”
function)
-facilitating drainage in the sub-surface zone

In fact all GTs act as change agents to the soil by concurrent
functioning of separation, filtration & drainage at the formative phase
Jute Geo-Textiles
Membrane & confining effect of JGT
Jute Geo-Textiles
JGT in Road Construction
Rough Guidelines for designing a new road with
JGT based on field trial results & lab. findings


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CBR to be taken as 1.5 times the control value
of CBR.
Woven JGT should be selected in conformity with the
average particle size distribution
Sub-surface drainage may be facilitated with suitable use of
non-woven JGT concurrently.
N.B Precise design guidelines are being finalised under an
international project on JGT sponsored by the Common Fund for
Commodities, a financial institution of the UN.
Jute Geo-Textiles
JGT in Road Construction
Note :



Choice of JGT also depends on the allowable rut
depth which is a factor of the level of service expected
of a road vis-à-vis the level of its maintenance
Porometry range: 150 to 400 microns depending on
the average grain size of the sub-grade
Tensile strength: 25 kN/m is considered adequate for
most of the roads
[Recommended by the CFGG Manual (France) for
SGT.]
Jute Geo-Textiles
JGT in Road Construction
Some Salient Findings of studies
 Percentage elongation at break of JGT is significantly
lower than that of synthetic geotextiles (maximum 15%
against more than 50 % of SGT)
(Ramaswamy & Aziz – 1989)
 Substantial reduction (more than 50%) in rut depth
under dynamic load tests with JGT
(Ramaswamy & Aziz – 1989)
 Loss of strength of JGT after a year is not a deterrent
as, by that time, JGT is seen to have helped in
providing a self sustaining sub-grade for most type of
soils
(Ramaswamy & Aziz – 1989)
 The gain in strength of the sub-grade with time is
compensated against the loss of strength of JGT
within the same time frame
(ibid & JU 2005)
Jute Geo-Textiles
Jute Geo-Textiles
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Effect of Jute Fabric on Compaction
Characteristics of Subgrade Soil
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Studies by Ramaswamy & Aziz (1989)
on Clayey Subgrade
Table - I
a) Water Content (%)
25
30
35
b) Undefined Compressive Strength (kN/m2)
i) without JGT
ii) with JGT
110
330
45
115
36
65
c) Strain at failure (%)
i) without JGT
ii) with JGT
8
26
10
30
22
42
Table - II
a) Water Content (%)
20
25
30
35
b) CBR (%)
i) without JGT
ii) with JGT
5.0
8
4.7
6.8
3.5
5.2
2.6
4.5
Jute Geo-Textiles
2. Slope Management with JGT
Roads built on high embankments require
preventive measures to control erosion of
slope surface.
Slopes erode due to:

Detachment of top soil by K E of rain drops

Flow of rain water (surface run-off)

Severe wind
Surficial soil erosion can be controlled by reducing the
velocity of surface run-off & entrapping detached soil
particles.
Wind-induced soil erosion can be controlled by suitable
JGT- cover
Jute Geo-Textiles
2. Slope Management with JGT
Remedial Concept
Universal Hydrological Equation in its simplest form
states
precipitation  surface flow + through flow ( sub-surface
flow ) + storage
If through-flow and on-land storage can be increased,
surface run-off gets reduced
Through-flow depends on hydraulic conductivity of the
soil. Storage can be facilitated by creating micro-barriers
on the slope. Such micro-barriers also curb the velocity of
surface flow
JGT is the ideal material that fulfills the requirements,
besides facilitating fast growth of vegetation on its biodegradation as a result of its mulching properties and by
increasing the hydraulic conductivity of soil
Jute Geo-Textiles
Soil Erosion Process on a Slope
RAIN
D
d
a
overland flow
material in suspension
XC
belt of no erosion
FLOW
active
e
b’ b
erosion
deposition of
sediments
c’ c
--------
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Dam Storage
D
Storage
Weft of open mesh
JGT
-- -- -- --
Storage
) β
-- -- -- -L
2.87 litres / sq.m. of water on a 1:2 slope
can be impounded when an open weave
JGT having 45 wefts in a metre, and dia
of 4mm in weft with an overall weight of
500 gsm. JGT is laid
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Installation of JGT on slope
Direction
of laying
+
Grass plant
Graded slope
150
Fixing nail
Shoulder anchor
(150 mm x 150mm)
Jute Geotextile
50 mm
150 mm
Fixing nail
(II Gauge wire)
Toe anchor
(150 mm x 150mm)
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3. Stability of Embankments

Embankment is an essential component of a road.

Almost all roads are built on embankments.

Expansive or compressive soils used as fills in
embankments may lead to:




Vertical settlement
Lateral dispersion
Downslope migration
Rotational slides (slip circle failure)
Jute Geo-Textiles
Stability of Embankments
JGT
absorbs stress and strain induced due to moving loads on
embankments

high soil - JGT interfacial friction acts as a good medium
of transference of the induced stress and strain

can directly reinforce the soil mass in an embankment
during its useful lifespan


Soil is otherwise stabilized due to separation, filtration
and drainage effects acting concurrently
Jute Geo-Textiles
Basal Reinforcement with JGT for any
new embankment is effective
• JGT can also be used in successive layers of an
embankment and may be folded at the fringes asside
restraint for protection against rotational slide
• In new embankments woven JGT may be used as
basal reinforcement to avert settlement
PRECAUTION
Prevent ingress of water into an embankment
 Drain out entrapped water from an embankment for which
installation of JGT- encapsulated concealed drains and, in
more severe cases, prefabricated vertical jute drains (PVJD)
deserves consideration.

Jute Geo-Textiles
Durability of JGT
As already indicated
Loss of strength of JGT after a year
is NOT a deterrent –
for, by that time, JGT provides a self-sustaining sub-grade for
most soils

The gain in strength of the sub-grade compensates the loss of
strength of JGT within the same time frame

With the passage of time dependence on JGT for soil stability
continues to decrease

However there is need to ensure JGT-durability ranging from 2 to 4
years (depending on the application-type) by special treatment.
Eco-friendly durability treatments have been developed by IIT, KgP
& IJIRA
Jute Geo-Textiles
Is Bio-degradability of JGT a
Technical Disadvantage?

The answer is NO. Optimal consolidation
(development of effective stress) is seen to take place
within the effective life of JGT
N.B. Effective life of JGT may be enhanced by specially
developed eco-friendly water-repellent treatment
(developed by IIT Kgp & IJIRA


Necessity of JGT or, for that matter, of any GT ceases after
filter-cake formation.
Bio-degradability of JGT is thus not a technical disadvantage.
Additionally JGT lends environmental advantage to road
construction
ENVIRONMENTAL ASPECTS
Jute Geo-Textiles
• Jute fibres are eco-friendly, soil-friendly,
biodegradable, annually renewable resource
Following points are relevant in context of ecoconcordance and socio-economic value of jute
a) During 100 days of jute growing period, 1 hectare of
jute plant can absorb about 15 MT of CO2 from
atmosphere and liberate about 11 MT of O2. Studies
reveal that CO2 assimilation rate of jute is higher
than trees (Inagaki, 2000; IJSG 2003). In fact jute
helps in carbon sequestration.
Jute Geo-Textiles
(contd.)
• Main use of jute sticks (a retting output) is as fuel and
household uses. Yield of jute sticks is 2.5times the
fibre by weight. Jute sticks annually saves 5.06
million tons of forest wood(in India and Bangladesh)
and help in preserving ecological balance.
• Leaves left in the field are good manures and increase
fertility of land. Increases hydraulic conductivity of
soil
Jute Geo-Textiles
Field Experience with JGT
 Experience in India & elsewhere with JGT in geotechnical
engineering applications numbering more than 150 in India
alone corroborates its effectiveness in road construction and
erosion control of diverse nature
 In road construction enhancement of CBR value is minim 1.5
times and in some cases the increase has been even 3-5
times after 4 years!
 Soil continues to consolidate even after bio-degradation of
JGT. In fact JGT triggers the process of consolidation thru’
development of effective stress. The process continues for a
protracted period.
Jute Geo-Textiles
Some salient properties of woven JGT
SOME PROPERTIES OF WOVEN JGT
VALUE
Tensile Strength
15 to 40 kN/m
Elongation-at-break
8% to 12%

JGT has a high initial tangent modulus (comparable
Puncture resistance

400 to 600 N
JGT offers a greater interfacial friction than SGT
Burst
strength
3000
to 4000 kPa

JGT has greater transmissivity than
SGT
Permittivity
with 50 mm
waterishead
x 10of-5 per
sec

Permittivity
of JGT
comparable ≈350
to that
SGT
Transmissivity
-on 724 gsm (25 kN/m) at 11.2 kPa
-on 627 gsm (20 kN/m) at 11.2 kPa
4.37 x 10-7 m 3 /m-s
3.64 x 10-7 m3 /m-s
AOS (O95)
100 µ upwards
Jute Geo-Textiles
Advantages Of JGT
– in summary

Economical

Easily available

Can be tailor made to meet the criteria of retention and permeability.

Precise control on quality and workmanship possible.

Quicker execution time.

Better drapability than any other geo-textile.

Provides a sustainable and eco-compatible solution.

Conducive natural protection against erosion through quick growth of
vegetation cover.
Jute Geo-Textiles
Newly developed products
Several new products have been developed recently based on Jute for
highway applications
•
JGT in asphaltic overlay for prevention
of reflection cracks. (developed by IIT Delhi)—not tried
•
Paving fabric for wearing course as alternative to mastic asphalt
(developed by IJT & CRRI (under the JTM sponsored by MoT with
NJB as the collaborating/facilitating organization) -under field trial
•
Development of durable & water-repellent JGT (recently developed by
IIT, KgP under the JTM) -under field trial
•
‘Jutecrete’-Jute-fibre reinforced concrete (developed by IIT, KgP)
under the JTM sponsored project by MoT with NJB as the
collaborating/facilitating organization) -under field trial
•
Pre-fabricated vertical jute drain (PVJD) developed by IIT Delhi &
Singapore Sate University (Prof R D Ramaswamy)-already tried
Standards/Normative References
Jute Geo-Textiles

IS 14986:2001—
-Guidelines for application of Jute Geo-textiles for rain water
erosion control in road & railway embankment and hill slope
-2 BIS guidelines on rural road constn & river bank protection
with JGT have recently been approved- under print

RDSO, Ministry of Railways & Rly Board–
-Specs for Open weave JGT in slope protection
-Guideline no GE:G1 (July 2003)—
-Guidelines for earthwork in railway projects
-Included as an item in the unified SoR of Railways 2011

Indian Roads Congress—
-State-of-the-art report on use of jute Geotextiles in Road
Constn & Prevention of Soil Erosion/Landslides (2012)
-Specifications for road & bridge works (2001) &
-Recommended practice for treatment of
embankment slope & erosion control (1991)
• I & W Deptt & PW(Roads) of GoWB have included JGT items in
their SoRs
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Illustrative Case Studies
Case Studies in road & slope erosion control
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Some Case Studies in Road with JGT
1. Re-construction of damaged highway on soft marine soil
using JGT at Kakinada Port – Andhra Pradesh
2. Strengthening of UT Road - Jorabari with JGT(Assam)
3. Strengthening of Chatumary - MDR14 road with JGT
(Odisha)
4. Widening and strengthening of Munshirhat – Rajpur
Road with JGT (West Bengal).
5. Strengthening of Andulia – Boyratola Road with JGT
(West Bengal)
Jute Geo-Textiles
Re-construction of damaged highway on
soft marine soil using JGT at Kakinada
Port – Andhra Pradesh
Jute Geo-Textiles
•
LOCATION :Kakinada
Andhra Pradesh
•
SITE CONDITION:
The subsoil is soft clay up to 4m depth
and water table is about 0.5m below G.L.
Port
Area,
Condition of Damaged Road
•
SOLUTION:
Woven JGT was used to re-build &
strengthen the damaged carriageway on
the existing soft soil
•
CLIENT NAME:
CRRI and Kakinada Municipality
•
Leveling of the damaged road with earth
YEAR OF APPLICATION: 1996
Jute Geo-Textiles
•
PAVEMENT COMPOSITION
JGT on prepared sub-grade overlain
by compacted sand of 1.2 m as subbase & 10 cm thick compacted
gravel as base. 1m deep side drains
on either side
•
PROPERTIES OF SUBGRADE
SOIL:
Plasticity Index:
32
Soil type:
CH
•
PROPERTIES OF JUTE
GEOTEXTILE USED:
Weight :
760 gsm
Tensile Strength :
20 kN/m
Pore Size (O90) :
300 micron
Type of JGT : Woven (Rot-proof)
Laying of JGT over sand
Finished road after 7 years of construction
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CBR VALUES OF SUB-GRADE SOIL BEFORE AND
AFTER LAYING OF JGT
Natural soil (before laying JGT)
CBR %
Improved soil (after laying JGT)*
CBR %
Un-soaked
specimen
Soaked specimen
Un-soaked
specimen
Soaked specimen
2.10
1.61
6.03
4.78
* Test
was performed after 30 months of laying JGT
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FINDING:
 Jute Geotextile helped increase of
CBR% in weak marine soil even after
reduction in the strength of JGT after
a lapse of 7 years as reflected from
the performance and increase in CBR.
Jute Geo-Textiles
Strengthening of UT Road - Jorabari
(Assam) with JGT
Jute Geo-Textiles
•
•
•
•
LOCATION :
The road (UT Road to Jorabari) is
located at Udalguri in Darrang district,
Assam
SITE CONDITIONS:
This was an earthen road under PMGSY
Pilot project. Flash flooding of the area
occurs occasionally. Deep ruts had
formed at some locations. Average
annual rainfall is 1600 – 1700 mm. The
water table is 3 to 4 m below G.L during
summer and 1.5 to 2 m during monsoon.
SOLUTION:
Jute Geotextile was used on sub-grade
to strengthen the road.
ROAD LENGTH: 4.6 Km
Before construction
Pavement composition
Woven JGT sandwiched bet.
sand layers (100) & overlain
by GSB (100), gravel (100)
& WBM Gr III (75) with
bituminous overlay
Jute Geo-Textiles
•
•
•
•
•
CLIENT NAME:
Chief Engineer PWD, Rural Road
Works, Assam
YEAR OF APPLICATION: 2007
PROPERTIES OF SUBGRADE
SOIL:
Liquid Limit:
24%
Plastic Limit:
Non-plastic
CBR of soaked specimen:
4%
Soil type:
ML
PROPERTIES OF JGT USED:
Weight :
643/760/810 gsm
Tensile Strength : 15/20/30 kN/m
Pore Size (O90) : 150 – 200 micron
Type of JGT :
Woven (Rot-proof)
Laying of Jute Geo-textile
Finished Road
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CBR VALUES OF SUB-GRADE SOIL BEFORE AND
AFTER LAYING OF JGT
Natural soil (before laying JGT)
CBR %
Improved soil (after laying JGT)*
CBR %
Soaked specimen
Soaked specimen
4.00
14.30
*after 3 years
Jute Geo-Textiles
FINDING:
• The CBR values increased by more than 3.5
times with decrease in moisture content.
• The blacktop pavement surface was distress-free
in all the sub-sections during the entire period of
performance monitoring
• Shoulders as well as side slope was in shape
without any rain-cut or settlement with green grass
over it.
Jute Geo-Textiles
Strengthening of Chatumary –
MDR-14 road, Odisha with JGT
Jute Geo-Textiles
•
•
•
•
LOCATION :
The road (Chatumari to MDR 14) is
located under Tehsil – Bari in Jajpur
district, Odisha.
SITE CONDITIONS:
This was an earthen road under PMGSY
Pilot project. Deep ruts had formed at
some locations. Average annual rainfall is
1400 mm. The water table is at a depth of
1.5 to 3 m.
SOLUTION:
Jute Geotextile was used on sub-grade to
add to stability of the road.
ROAD LENGTH: 2.67 Km
Before construction
Pavement composition
Woven JGT sandwiched bet.
sand layers (100) & overlain by
GSB (100), gravel (100) & WBM
Gr III (75) with bituminous
overlay
Jute Geo-Textiles
•
•
•
•
•
CLIENT NAME:
Chief Engineer PWD, Rural Works – II
Orissa
YEAR OF APPLICATION: 2007
PROPERTIES OF SUBGRADE SOIL:
Liquid Limit:
27%
Plastic Limit:
Non-plastic
CBR of Soaked specimen: 3%
Soil type:
ML
PROPERTIES OF JGT USED:
Weight :
643/760/810 gsm
Tensile Strength : 15/20/30 kN/m
Pore Size (O90) : 150 – 200 micron
Type of JGT :
Woven (Rot-proof)
Laying of Jute Geo-textile
Finished Road
Jute Geo-Textiles
CBR VALUES OF SUB-GRADE SOIL BEFORE AND
AFTER LAYING OF JGT
Natural soil (before laying JGT)
CBR %
Improved soil (after laying JGT)*
CBR %
Soaked specimen
Soaked specimen
3.00
10.13
*after 2 years
Jute Geo-Textiles
FINDING:
• The CBR values increased more than 3 times with
decrease in moisture content.
• The blacktop pavement surface was distress-free
in all the sub-sections during the entire period of
performance monitoring
• Shoulders as well as side slope condition was
satisfactory with a green cover of grass
Jute Geo-Textiles
Widening and strengthening of Munshirhat
– Rajpur Road (West Bengal) with JGT.
Jute Geo-Textiles
•
•
•
•
•
•
LOCATION :
Munshirhat to Penro Khila Rajpur
Road, Howrah, West Bengal.
SITE CONDITIONS:
It is a rural road which was to be
widened to carry the increased traffic.
SOLUTION :
Jute Geotextile was laid on the
extended portion
ROAD LENGTH: 2 Km
CLIENT:
Howrah Highway Division, PW
(Roads) Deptt., Government of West
Bengal
YEAR OF APPLICATION: 2000
JGT laid over sub-grade
Brick metal laid over JGT
Jute Geo-Textiles
•
•
PROPERTIES OF SUBGRADE
SOIL:
O.M.C
: 19%
Plasticity Index
: 19%
CBR of Soaked specimen : 3.5%
Soil type
: OL
PROPERTIES OF JGT USED:
Weight :
760 gsm
Tensile Strength :
20 kN/m
Pore Size (O90) :
300 micron
Type of JGT :
Woven (Rot-proof)
Finished Road
Pavement composition
Woven JGT was placed on the
sub-grade of the widened
portion overlain by 2 layers of
brick soling as sub-base and
WBM (150) as base layer with
bituminous top (20 cm PMC).
Jute Geo-Textiles
CBR VALUES OF SUB-GRADE SOIL BEFORE AND
AFTER LAYING OF JGT
Natural soil (before laying JGT)
CBR %
Improved soil (after laying JGT)*
CBR %
Soaked specimen
Soaked specimen
3.50
6.0
*after 1 year
Jute Geo-Textiles
FINDING:
The sub-grade was strengthened by application
of JGT attaining CBR value of 6% from initial 3.5%
with decrease in liquid and plastic limits. No
distress of the road was noticed after several
years despite increase in projected traffic load.
Jute Geo-Textiles
Strengthening of Andulia –
Boyratola Road, West Bengal
with JGT
Jute Geo-Textiles
•
•
•
LOCATION :
Andulia (Kalupukur More) to Boyratala in
Haroa Block, District North 24Paraganas, West Bengal.
SITE CONDITIONS:
Rural road under PMGSY on soft subgrade resulting in reduction of effective
pavement
thickness
due
to
interpenetration of sub-base and subgrade.
SOLUTION:
Jute Geo-textile was used on the subgrade and under the sub-base basically as
a separator.
ROAD LENGTH: 3.3 Km
ANDULIA – BOYRATALA ROAD BEFORE LAYING JGT
Pavement composition
Woven JGT overlain by
GSB (200)) & WBM II&
III (150) with bituminous
overlay (PMC)
Jute Geo-Textiles
•
•
•
•
CLIENT NAME:
North 24-Paraganas Zilla Parishad,
West Bengal
YEAR OF APPLICATION: 2005
PROPERTIES OF SUBGRADE SOIL:
Optimum Moisture Content: 23.5%
Plasticity Index:
18.10
Soaked CBR at 2.5mm penetration:
3.22%
Soaked CBR at 5.0mm penetration:
3.16%
Soil type : OL
PROPERTIES OF JGT USED:
Weight :
810 gsm
Tensile Strength :
30 kN/m
Pore Size (O90) :
150micron
Type of JGT :
Woven JGT
Finished Road
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CBR VALUES OF SUB-GRADE SOIL BEFORE AND
AFTER LAYING OF JGT
Natural soil (before laying JGT)
CBR %
Improved soil (after laying JGT)*
CBR %
Soaked specimen
Un-soaked specimen
3.16
10.47
* Test
was performed after 18 months of laying JGT
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• FINDING:
The study substantiates the proven concept that
limited durability of JGT is not a technical
deterrent as soil gets consolidated due to
separation, filtration and drainage functioning
concurrently with the help of JGT within a year or
so. CBR value got enhanced to more than 3 times
despite loss in strength of JGT in the instant case.
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Some Photographs
showing application of JGT
for Stabilization of Slope
of Road Embankment
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NH-2, ALLAHABAD BYPASS, U.P.
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NH-3, GUNA BYPASS, M.P.
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BRIDGE APPROACH ON R. MUNDESHWARI, W.B.
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HILL SLOPEGUWAHATI-SHILLONG ROAD AT
SONAPUR
LAYING OF JUTE GEOTEXTILE AFTER
DRESSING OF SLOPE
SLOPE COVERED WITH VEGETATION
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NH 55—PAGLAJHORA IN NORTH OF W.B
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Typical cross-section of a low volume road with JGT
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Findings of the case studies



Water content, void ratio and compression index
decreased while dry density and CBR value of the
sub-grade soil increased by use of Jute Geotextile.
JGT appeared to be very effective even in weak subgrade in reducing their compressibility and
increasing their strength as reflected from the good
performance even after a lapse of 10 years.
JGT is the most effective among geotextiles for
surficial soil erosion control
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MISSIVE
• JGT is an effective technical facilitator in building
stronger and more durable roads with the added
advantage of lending eco-concordance by reducing
carbon footbprint & ensuring overall economy .
• Jute plays a significant role in national economy as a
major FE earner & one of the largest employers of
work-force in India
•
JGT JUSTIFIABLY DESERVES MORE PATRONAGE
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