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Presented to 64th Annual School for Highway Superintendents By L. David Suits, Executive Director, North American Geosynthetics Society GEOSYNTHETICS IN TRANSPORTATION
Presented to 64th AnnualSchool for Highway SuperintendentsByL. David Suits, Executive Director, North American Geosynthetics Society
GEOSYNTHETICS IN TRANSPORTATION
OVERVIEW OF PRESENTATIONOVERVIEW OF PRESENTATION
Introduction Introduction Brief Historical Perspective
O i f G th ti i T t ti Overview of Geosynthetics in Transportation Overview of Manufacturing of Geosynthetics Applications of Geosynthetics in Transportation Specifications Specifications Discussion/Questions
INTRODUCTIONINTRODUCTION
L. David Suits Retired NYSDOT Geotechnical Engineering Bureau Retired, NYSDOT – Geotechnical Engineering Bureau
Soil Mechanics Laboratory Supervisor Responsible for all soil foundation design testing Responsible for testing and approval of geosynthetics for use on NYSDOT Projects
Past chair of ASTM International Committee D35 on Geosynthetics Past chair of ASTM International Committee D35 on Geosynthetics Current chair of ISO Committee TC 21 on Geosynthetics TRB Activities
Past chair of following: Subsurface Drainage Committee Subsurface Drainage Committee Geosynthetic Committee Soil Mechjanics Section Design and Construction Group
AASHTO Activities TF 25 – Developed AASHTO Specification M-288 for Geosynthetics Past chair the AASHTO NTPEP Geosynthetics Panel
Currently: Executive Director of NAGS Adjunct Professor at RPI FHWA/NHI Geosynthetics Course Instructor
NORTH AMERICAN GEOSYNTHETICVS SOCIETYNORTH AMERICAN GEOSYNTHETICVS SOCIETY
The mission of NAGS is to provide leadership in p padvancing the education and research of geosynthetics, in strong cooperation with IGS, via the following ways: Organization of and participation in technical conferences, seminars
and workshops.and workshops. Development and dissemination of tools for geosynthetics education. Recognition of technical contributions and innovations regarding
geosyntheticsgeosynthetics. Stimulation of geosynthetics research and their applications through the
NAGS Awards of Excellence Program.
NORTH AMERICAN GEOSYNTHETICS SOCIETYNORTH AMERICAN GEOSYNTHETICS SOCIETY
Individual Member Society (230 +) Individual Member Society (230 ) Academia Industry Industry ConsultantsGeosynthetic SuppliersGeosynthetic SuppliersOthers
GeotextilesGeotextilesGeotextilesGeotextiles
GeogridsGeogrids
GeomembranesGeomembranes
GeonetsGeonets
GCLSGCLS Geowebs . Geowebs .
Geodrains GeomeshsGeodrains Geomeshs
Geosynthetic erosion control mats and Geosynthetic erosion control mats and blanketsblankets
GeocompositesGeocomposites
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MANUFACTURING OVERVIEWMANUFACTURING OVERVIEW
Geotextiles GeotextilesNon-wovenWovenWoven
GeogridsBi i lBiaxial
Uni-axial
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SEPARATIONSEPARATION
Fines Migration/Pumping
HMA
BBase
Subgrade
AGGREGATE PENETRATION
HMA
Base
Subgrade
Stabilization
Base ReinforcementBase Reinforcement
BASE REINFORCEMENT APPLICATION
BASEAC
GEOSYNTHETICGEOSYNTHETIC
SUBGRADE
St t l t Structural component Impacts operational life of roadway
Contrasted against s bgrade stabili ation Contrasted against subgrade stabilization
APPLICATIONS OFAPPLICATIONS OFREINFORCED EMBANKMENTS
OVER SOFT FOUNDATION SOILS
New embankments
E b k t id i g Embankment widening
Temporary construction access
OVER LOCAL ANOMALIES
SOFT FOUNDATIONS
NEW EMBANKMENTSNEW EMBANKMENTS
SCDOT Project
EMBANKMENT WIDENINGEMBANKMENT WIDENING
REINFORCED SOIL SLOPESREINFORCED SOIL SLOPES
Improve stability for steepened slopesImprove stability for steepened slopes
Improve stability for slope repair
Compaction aids
APPLICATIONS
Steepened Slope to t t fstay out of
“wetlands”
Mechanically Stabilized Earth Walls (MSEW)
MECHANICALLY STABILIZED EARTH STRUCTURES (MSEW)( )
THE FOUNDERS MEADOWS STRUCTURE(I 25 EXIT 184)(I-25, EXIT 184)
GEOSYNTHETICS FOR IMPROVED DRAINAGEDRAINAGE
APPLICATIONS IN PAVEMENT DRAINAGE SYSTEMS
Geotextile filters for edge drains and underdrainsdrains and underdrains
Geocomposite vertical edge drain
APPLICATIONS IN PAVEMENT DRAINAGE PAVEMENT DRAINAGE SYSTEMS
G t til ti /filt Geotextile separation/filter for free draining base and/or subbase layersand/or subbase layers
Geocomposite horizontal drainage layers (to replace or augment free draining b )base)
PAVEMENT OVERLAYSPAVEMENT OVERLAYSPAVEMENT OVERLAYSPAVEMENT OVERLAYSLesson 16Lesson 16
GEOTEXTILES FUNCTIONSGEOTEXTILES FUNCTIONS
Moisture BarrierMoisture Barrier
Stress-Relieving Stress Relieving
Interlayer
SILT FENCESSILT FENCES
TURBIDITY CURTAINTURBIDITY CURTAIN
NYS DOT SPECIFICATION FOR GEOTEXTILESNYS DOT SPECIFICATION FOR GEOTEXTILES
Must be on the Approved List Must be on the Approved List Applications
SeparationSeparationStabilizationDrainageSlope ProtectionBeddingSilt FenceTurbidity Curtain
NYS DOT EXAMPLESNYS DOT EXAMPLES
Separation Separation
NYS DOT EXAMPLESNYS DOT EXAMPLES
Stabilization Stabilization
NYS DOT EXAMPLES
Drainage/ Drainage/Filtration
NYS DOT EXAMPLESNYS DOT EXAMPLES
Slope Protection (Erosion Control) Slope Protection (Erosion Control)
NYS DOT EXAMPLES
Bedding Bedding
NYS DOT EXAMPLESNYS DOT EXAMPLES
Silt Fence Silt Fence
NYS DOT EXAMPLESNYS DOT EXAMPLES
Turbidity Curtain Turbidity Curtain
NYS DOT APPROVED LISTNYS DOT APPROVED LIST
Basis for Acceptance Basis for AcceptanceMust be tested through the AASHTO National
Transportation Product Evaluation ProgramTransportation Product Evaluation ProgramNYS DOT Geotechnical Engineering Bureau, Soil
Mechanics Laboratory the testing lab of the program.
Material RequirementsBased on AASHTO M-288 Specification for GeotextilesDetailed explanation available at:
https://www.nysdot.gov/divisions/engineering/technical-services/technical-services-repository/directive.pdfservices/technical services repository/directive.pdf
All testing per ASTM Standards
NYS DOT REQUIREMENTSNYS DOT REQUIREMENTS
General Strength Requirements1 General Strength Requirements
Property Geotextile Class2
Class 1 Class 2 Class 3Class 1Elongation Elongation
Class 2Elongation Elongation
Class 3Elongation Elongation
< 50% > 50% < 50% > 50% < 50% > 50%
Grab Str 315 lbf3 202 lbf 247 lbf 157 lbf 180 lbf 112 lbfGrab Str. 315 lbf 202 lbf 247 lbf 157 lbf 180 lbf 112 lbf
Tear Str. 112 lbf 79 lbf 90 lbf4 56 lbf 67 lbf 40 lbf
Puncture 112 lbf 79 lbf 90 lbf 56 lbf 67 lbf 40 lbf
1 Values are minimum average value for specimens tested. 2 Class of geotextile required for specific applications is designated in the
application tables which follow (Tables 2-8).3 S f C 1 4 4 3 Soft Conversion: 1lb = 4.45 N
4 For woven monofilament geotextiles the minimum average value is 250 N (56 lbs).
NYS DOT REQUIREMENTSNYS DOT REQUIREMENTS
NYS DOT REQUIREMENTSNYS DOT REQUIREMENTS
NYS DOT REQUIREMENTSNYS DOT REQUIREMENTS
NYS DOT REQUIREMENTSNYS DOT REQUIREMENTS
NYS DOT REQUIREMENTSNYS DOT REQUIREMENTS
NYS DOT REQUIREMENTSNYS DOT REQUIREMENTS
NYS DOT REQUIREMENTSNYS DOT REQUIREMENTS
NYS DOT APPROVED LISTNYS DOT APPROVED LIST
Go to NYS DOT WEB
NYS DOT SUBMISSION PROTOCOLNYS DOT SUBMISSION PROTOCOL
As stated before, must go through the AASHTO- As stated before, must go through the AASHTONTPEP process Application made by the manufacturer to AASHTO Application made by the manufacturer to AASHTO
for testingNYS DOT notified of applicationNYS DOT notified of application
Arranges for samples to be taken by a DOT representative in the State where the plant is located
Sample sent to NYS DOT Geotechnical Engineering Bureau
NYS DOT SUBMISSION/APPROVAL PROTOCOL
NTPEP process (cont)NYS DOT L b di AASHTO NYS DOT Lab tests according to AASHTO Specification M-288, with addition of Mass/unit area testarea testGeosynthetic Research Institute Accrdited
Manufacturer notified of test resultsManufacturer notified of test resultsMay challenge result and ask for re-test
Once manufacturer satisfied with results they are Once manufacturer satisfied with results, they are published through AASHTO-NTPEP for use by all State DOTs(Not all states use them however.)
NYS DOT reviews results and approves/disapproves as per previous requirements
PROJECT PROTOCOLPROJECT PROTOCOL
Review of material received at the project site Review of material received at the project site Ensure that product designation agrees with
Approved ListApproved List If visually the same as the material tested,
accepted for that projectp p j If one or both of the criteria above isn’t met,
rejected Sample also sent to Lab for QA testing
RESOURCESNumerous Conference Proceedings through IFAI Numerous Conference Proceedings through IFAI
Two JournalsG t til d G bGeotextiles and Geomembranes
Geosynthetics International Free electronic subscription with NAGS membership
Text BooksDesigning with Geosynthetics
5th Edition; Dr. Robert Koerner
Geosynthetic EngineeringDrs. Robert Holtz, Barry Christopher, Ryan Berg
FHWA/NHI – Geosynthetic Design and Construction Guidelines
QUESTIONS/DISCUSSIONQUESTIONS/DISCUSSION
THANK YOUGS S NAGS WEBSITE: nags-igs.org
Dave Suits contact: [email protected]
