Presentation on theme: "Jute Geotextile – Potential and Application in Road Works"— Presentation transcript:
1Jute Geotextile – Potential and Application in Road Works Sudhir MathurChief Scientist & Advisor (Planning and Policy Issues)Central Road Research InstituteNew Delhi
2Geotextile UsageBillions of square m of geotextiles is estimated to have been used world wide last year – China using about 50 per cent of this quantityAbout 10 million square m of geosynthetics used in India last year, worth several million US $Huge potential for usage of geosynthetics in on-going road development projectsJute/Natural fabrics also has a large potential for future road projects- but not been marketed as vigorously as synthetic
3Jute Geotextile Usage – Potential Areas Largest potential areas are hill roads and embankment slope protection from erosion controlOther areas are separation, filtration, sub-surface drainage and reinforcement to some extent.
4Publications by IRCState of Art Report: Use of Jute Geotextiles in Road Construction and Prevention of Soil Erosion/Landslide. Special ReportMoRTH ,2013- Standard Specifications for Road and Bridge works› Section 700; Clause 707 deals with NATURAL GEOTEXTILEThe work covers the use of natural geotextiles for control of erosion of slopes including supplying and laying the mat spreading soil and seeding to promote the growth of vegetation, as per design, drawing and these specifications.›Natural Geotextile shall be used to control surface erosion of top cover soil on cut or fill slopes and to facilitate vegetation to grow.Strength Requirements:The natural fibre geotextiles made of Jute shall meet the minimum requirement as stated in IS Woven Jute Geotextiles – Specification.
5Use of Jute Geotextiles for Improving Performance of PMGSY Roads (Pilot Project) To study the use of jute geotextile in the road pavement (Benefit of JGT of varying strength as an agent for improvement in load bearing capacity of the subgrade, specifically the subgrade CBR and overall improvement in pavement performance)Role of open weave JGT as bio-engineering protective measure by facilitating growth of vegetation on the embankment slopes and earthen shouldersDPR for 10 Pilot project under varying soil/ climatic conditions was prepared jointly by CRRI & JMDC for 5 States namely West Bengal, Assam, Orissa, Madhya Pradesh and ChatisgarhHowever, due to certain technical and administrative problem only 5 roads could be completed.
6Use of Jute Geotextiles (JGT) for Improving Performance of Rural Roads To study the use of jute geotextile in the road pavement as a drainage layer, Bioengineering measure for shoulders and earthen slopes, Improving the pavement performance and Reducing the pavement crust thicknessPavement sections as per IRC Practice, Thinner pavement sections without JGT and Test sections incorporating different varieties of JGTPilot project taken up in 5 PMGSY roads across five states under varying soil/ climatic conditionsGSBW.B.MPMCSubgradeControl Section IJGT + SandSand BedJGT (Open Weave)Control Section IIJGT Test SectionsGravel
7Pavement cross section with IRC-SP-20 (Conventional section I ) TYPICAL ROAD SECTIONS ADOPTED IN PMGSY PROJECTPavement cross section with IRC-SP-20 (Conventional section I )
8TYPICAL ROAD SECTIONS ADOPTED IN PMGSY WITH REDUCED CRUST Pavement cross section with reduced thickness (Conventional section II)
9ROAD SECTIONS IN ASSAM WITH REDUCED CRUST SECTIONS Jute geotextile as a separator
10ROAD SECTIONS FROM JARBARI TO BARNIGAON AT ASSAM Jute geotextile as a separator and turfing
22CONCLUSIONSThe performance of JGT incorporated sections with reduced pavement crust viz- a- viz control section (with conventional pavement thickness) have exhibited similar performance in terms of distress and characteristics deflection (a measure of structural strength of pavement).2) No conclusive decision based on performance data can be made regarding the improvement in pavement performance with geotextile of higher strength.3) The characteristics deflections in some of the test sections with jute geotextile remain more or less unchanged over a period of time. It indicate that test sections with jute geotextile structurally remain stable despite lesser thickness.
234) The pilot project studies were also aimed to find out improvement in subgrade, which can be achieved by using jute geotextile. It was expected that the inclusion of jute geotextile would absorb/ drain the excess moisture in the subgrade and would result in the improvement of soil subgrade strength in terms of CBR. Several DCP tests were carried out at different locations of the test sections. However, with two cycles of performance observation data, non conclusive decision could be made to reveal any appreciable improvement in in-situ CBR values.
245) Open weave JGT, which was used is a bio-engineering measure to pavement erosion has performed very satisfactorily. It clearly suggests that jute geotextile is very effective to prevent erosion and protecting side slopes.6) Since the traffic generated on these selected low volume roads is not very significant, it is difficult to exactly quantify the benefits of incorporating jute geotextile based on two sets of performance observations.7) It is therefore suggested that to arrive at definite conclusions about performance of JGT incorporated pavement sections, more roads be constructed and performance observations be taken at least for a period of five years.