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Specifications for Geotextiles in India

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Specifications for Geotextiles in India by R. P. Indoria Secretary General, Indian Roads Congress 19 November 2010 Physical Requirements for Paving Fabrics Property ... – PowerPoint PPT presentation

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Title: Specifications for Geotextiles in India


1
Specifications for Geotextiles in India
  • byR. P. Indoria
  • Secretary General, Indian Roads Congress
  • 19 November 2010

2
ABOUT IRC
  • Indian Roads Congress is a Society of Highways
    Engineers established in 1934
  • Frames Codes of Practice , Standards, Guidelines,
    Manuals etc. on various subjects for Roads and
    Bridges
  • Identification of research topics and
    Institutions
  • Collection of data on research done and
    utilization there of
  • (Cont)

3
ABOUT IRC
  • Dissemination of Research findings for revision
    of IRC Codes and Special Publications
  • Holding Workshops and Seminars on Crucial Topics
    for dissemination of knowldge
  • Promoting Usages of New Materials and
    Technologies

4
IMPORTANCE AND USAGES OF GEOTEXTILE IN ROAD
SECTOR
  • Use as Separator to Improve Pavement Performance
  • Use as reinforcement and drainage layer
  • Use for Ground Improvement
  • Use for drainage of ground (PVD/piped drains)
  • Jute Geogrid for Erosion Control of Denuded
    Slopes
  • Jute Geotextile for Drainage and Filtration
    Application
  • Jute is low cost, renewable, biodegradable and
    eco-friendly natural product
  • (Cont)

5
IMPORTANCE AND USAGES OF GEOTEXTILE IN ROAD
SECTOR
  • Construction of road embankments in water logged
    area
  • Soil Nailing
  • River Bank Protection
  • Embankment slope protection

6
TYPES OF GEOTEXTILES
  • Geotextile Non Biodegradable Synthetics Woven /
    Non Woven Fiber and perform discrete function
    i.e. separation, reinforcement, filtration,
    drainage and moisture barrier (when impregnated).
  • Geogrids Open, grid like configuration, i.e.,
    they have large apertures and used for the
    purpose of separation, but invariably they are
    being used in some form of reinforcement.
  • ( Cont)

7
TYPES OF GEOTEXTILES
  • Geonets another specialized segment of
    Geosynthetics and Geonets are used for the
    purpose of drainage. It is to be noted that
    geonets are always used with a geotextile.
    Geonets used in protective works for highway
    structures
  • Geocomposite A geocomposite consists of a
    combination of geotextile and/or geogrid and/or
    geomembrane or any of these three materials with
    another material in laminated or composite form
    and used for accelerating the consolidation of
    soft soils.
    (Cont)

8
TYPES OF GEOTEXTILES
  • Geomembranes Geomembranes are also synthetic
    materials but they are impervious and made of
    thin sheets of rubber or plastic materials used
    primarily for lining and cover of liquid-or
    solid-storage facilities
  • Geocell A three dimensional structure with
    interconnected cells which can be filled with
    soil/granular material forming a mattress for
    increased bearing capacity and manoeuvrability on
    loose or compressible subsoil of base or sub-base
    in pavements and slope protection
  • (Cont)

9
TYPES OF GEOTEXTILES
  • Natural Geotextiles Natural fibres are extracted
    from plants and are then converted into yarns by
    spinning. These fabrics are sometimes treated
    with rot resistance materials or reinforced with
    synthetic fibres to enhance their durability
    under different soil conditions without affecting
    its strength and other properties. Natural fibres
    such as jute, coconut and coir fabrics are used
    to improve soil erosion control and drainage
    applications.

10
USE OF GEOTEXTILE FOR IMPROVING PERFORMANCE OF
ROADS
  • Geosynthetics for Highway Pavements
  • Geosynthetics Over Existing Bituminous Surface
  • Provision of Geotextiles Against Subgrade and
    Embankment Erosion
  • Geotextiles In Sub-surface and Composite Drains
  • Geogrid Applications For Reinforced Soil Slope
    Protection

11
USE OF GEOTEXTILE FOR IMPROVING PERFORMANCE OF
ROADS
  • Road pavement as a drainage layer, Bioengineering
    measure for shoulders and earthen slopes,
    Improving the pavement performance and Reducing
    the pavement crust (?)
  • Construction of road embankments in water logged
    area
  • Soil Nailing , Soil Stabilization

12
IRC DOCUMENTS ON GEOTEXTILES
  • IRC has one document titled State of the Art
    Application of Geotextiles in Highway
    Engineering published by IRC in 1994
  • It is a compilation of available literature (at
    the time of preparation of the report)
  • Since then a lot of developments have taken place
    in manufacturing and preparation of geotextiles,
    their usage and applications etc.

13
IRC DOCUMENTS ON GEOTEXTILES
  • IRC has another document titled SP59 2002
    Guidelines for use of Geotextiles in road
    pavements and associated works
  • Being a Special Publication, this document does
    not have the status of a Code of Practice per
    se but nevertheless covers the following
  • Scope
  • Raw Material and types of Geotextiles
  • Functions of Geotextiles

14
IRC DOCUMENTS ON GEOTEXTILES
  • Handling and storage of geotextiles
  • Geotextiles properties and test methods
  • Geotextiles property requirements for various
    applications
  • Construction guidelines for use of geotextiles in
    various applications
  • References have been made to ASTM standards for
    test methods

15
GEOTEXTILES SPECIFICATIONS
  • More comprehensive specifications are included in
    the Ministry of Road Transport and Highways book
    of Specifications, popularly known as the Orange
    Book
  • The current edition of this book is also very old
    (2001) and a revision of the book has been almost
    finalised and is likely to be published soon

16
GEOTEXTILES SPECIFICATIONS
  • The proposed specifications(section 700) cover
    the following
  • 1 GEOSYNTHETICS IN ROAD AND BRIDGE WORKS
  • Scope
  • Testing, handling, certification, and acceptance

17
  • Minimum Geotextile strength property requirements

18
  • Geotextile Requirements for Ultra Violet Light
    Degradation

19
  • Properties for Prefabricated Vertical Drains

20
  • Typical Specifications for Geocells

21
  • Typical Specifications of Natural Geotextile

22
  • 2 GEOTEXTILES IN SUB SURFACE DRAINS
  • Scope
  • Materials
  • Construction requirements
  • Measurement for payment
  • Rate

23
  • Geotextile Requirements for Subsurface Drainage

24
  • Recommended Permittivity for Different Soils

25
  • 3 Use of Geosynthetics in Composite Drains
  • Scope
  • Material
  • Installation
  • Measurement for payment
  • Rate
  • Apparent Opening Size for Geo-composite Drains

26
  • 4 GEOTEXTILES FOR EROSION CONTROL
  • Scope
  • Materials
  • Construction requirements
  • Slope protection placement
  • Seams
  • Repair
  • Measurement for payment
  • Rates

27
  • Erosion Control Geotextile Requirements

28
  • 5 GEOGRID APPLICATIONS FOR REINFORCED SOIL SLOPE
    PROTECTION
  • Description
  • Material
  • Installation
  • Measurement and basis for payment
  • Rates

29
  • 6 GEOSYNTHETICS FOR HIGHWAY PAVEMENTS
  • Scope
  • Materials
  • Certification
  • Installation
  • Measurement for payment
  • Rate

30
  • Separation/Filtration Property Requirement for
    subgrade Soil with LL lt 35 (such as ML, CL, CL-ML
    etc)
  • The soil classification shall be as per
    BIS-1498 1970 (Re-affirmed 1987)

31
  • Separation/Filtration Property Requirement for
    subgrade Soil with LL gt 35 (such as CL, CH, MH
    etc)
  • The soil classification shall be as per
    BIS-1498 1970 (Re-affirmed 1987)

32
  • Requirements for Geogrid for Sub-Base/base of
    Flexible Pavements
  • Note 1) All numerical values in the Table
    represent MARV in the specified direction.
  • 2) All geogrids shall be placed along machine
    direction parallel to the centre line of roadway
    alignment.
  • 3) Junction strength is required to maintain
    dimensional stability of the geogrid during
    deployment. It is not applicable to
    geogrid/geotextile composite products.

33
  • 7 GEOSYNTHETICS OVER EXISTING BITUMENOUS SURFACE
  • Scope
  • Paving Fabrics
  • Material Requirement
  • Specifications for bitumen coated fiber glass
    fabric
  • Placement
  • Measurement
  • Rate

34
  • Physical requirements for Paving Fabrics

35
  • Properties for Glass Grid Fiber

36
Framework for promoting usages of Geotextile
  • Majority of the National Highway Development
    Programme to be implemented on PPP mode on BOT
    basis
  • The use of geotextile for road structure i.e.
    part of new or existing pavement does not bring
    the desired reduction in crust thickness since
    the pavement has to be designed as per IRC37
  • There is a strong need to establish relationship
    between use of a type of geosynthetic and
    corresponding reduction in crust thickness

37
Framework for promoting usages of Geotextile
  • This can only be achieved by concerted research
    (may be industry sponsored) with the involvement
    of research institutes and academia
  • This could lead to formulation of definitive
    specifications and design methods using
    geotextiles/ geosynthetics
  • For the interim, the Government has created an
    enabling environment for the Concessionaire to
    use any material / technology / equipment as long
    as it meets any of the established international
    standards

38
Framework for promoting usages of Geotextile
  • The Manuals for four and six laning of highways,
    which form part of the Concession agreement, have
    been published by IRC containing this provision
  • Industry need to come out with ways and means to
    demonstrate to the prospective users
    (Concessionaires) the cost effectiveness (short
    term and long term) of the use of geotextiles
  • Industry also to come out with other innovative
    usage of geosynthetics besides the existing ones

39
Framework for promoting usages of Geotextile
  • On our part in IRC we have started a process of
    accreditation of new material / technologies /
    equipment etc. for use in the design and
    construction of highways
  • The proposals are examined by an Accreditation
    Committee constituted within IRC and comprising
    of experts from public as well as private sector
  • Upon satisfaction, the Committee issues an
    Accreditation Certificate which acts as a
    confidence measure with the prospective buyers

40
Framework for promoting usages of Geotextile
  • We also insist on field trial / usage reports
    from clients
  • In case of satisfactory performance reports, the
    new material, technology or equipment will then
    be suitably incorporated in Codes of Practices /
    Specifications

41
Conclusion
  • Need to establish relationship with cost (crust)
    reduction with usage of geosynthetics
  • Concerted research to have road crust design
    methods and formulate specifications
  • Concessionaires to be apprised of benefits of
    geosynthetics

42
Thank You for your kind attention
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