MSE Walls & Geosynthetics - Design Basics Webinar April 2016
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Join Andy Lister and Michael McQuaid for an introduction to the design basics behind Geosynthetics and MSE Walls! The presenters will begin by introducing different geosynthetics and their uses, followed by focusing on geogrid properties and what you need to know when selecting and specifying different geogrids. You will then learn about how mechanically stabilized earth (MSE) retaining walls work. This will include general design requirements, through the review of potential failure modes. The presenters will finish by discussing different MSE retaining wall facing options while highlighting successful past projects.
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MSE Walls & Geosynthetics - Design Basics Webinar April 2016
- 1. Randy McDonald, P.Eng. Director of Engineering Armtec Drainage Solutions Frank Klita Sales Representative Armtec Drainage Solutions Michael McQuaid P.Eng. Design Engineer Armtec Drainage Solutions Andrew Lister Sales Manager Mirafi® Geosynthetics, TenCate Geotube® FRIDAY APRIL 22, 2016 / 9AM PST / 11AM CST / 12PM EST TECHNICAL WEBINAR MSE WALLS AND GEOSYNTHETICS DESIGN BASICS
- 2. YOUR HOST Janine Yetke Director of Marketing Armtec, Drainage Solutions LinkedIn: ca.linkedin.com/in/janineyetke/en Email: Janine.Yetke@armtec.com
- 3. CPD CREDIT CERTIFICATES • Qualifies in Most Jurisdictions in Canada & USA for 1 Hour Technical Informal • Formal completion certificates are emailed within two weeks of attending • Check your local guidelines if unsure of your requirements Email your complete attendee list should there be multiple individuals viewing the same screen: • Full Name • Title • Email webinars@armtec.com Armtec will send certificate to all participants
- 4. Armtec is one of Canada’s largest infrastructure company supplying precast, corrugated steel and HDPE products and solutions. Every day, our proven products, engineered solutions and dedicated people are counted on to support construction and infrastructure projects in communities everywhere. With a national presence and a local focus on exceptional customer service, we are dedicated to building excellence. Actual 2016 Locations 40 Drainage Locations Precast Locations ABOUT ARMTEC
- 5. SECTORS Armtec specializes in all infrastructure markets and segments and can help with any project to ensure you have the right products for the job. Our people have extensive experience and access to resources all across the country, and can help with all facets of product selection, installation and support. Stormwater Solutions Mining & Energy Commercial & Retail Constructions Transportation Underground & Utility Infrastructure Sports & Entertainment Institutional Construction Industrial Construction Agriculture Commercial & Residential Landscaping Forestry Residential & Hospitality ABOUT ARMTEC
- 6. Armtec Drainage Solutions’ centralized engineering department consists of design engineers, a drafting team, and estimators. Additionally, professionally licensed Region engineers are located in all Market Areas across the country. DRAINAGE ENGINEERING SUPPORT & ROLES ABOUT ARMTEC
- 7. YOUR SPEAKERS Michael McQuaid P.Eng. Design Engineer Armtec, Drainage Solutions Michael.McQuaid@armtec.com Andrew Lister Sales Manager Mirafi® Geosynthetics, TenCate Geotube®
- 8. AGENDA 1. Review of Geosynthetics 2. Types of Geosynthetics 3. Geogrids 4. MSE Wall Components 5. Analysis of MSE Walls 6. MSE Wall Types & Facing Options
- 9. REVIEW OF GEOSYNTHETICS Geosynthetics: Generic term for all synthetic materials used in geotechnical engineering applications, including • Textiles • Grids • Nets • Membranes • Composites
- 10. POLYMERS USED IN GEOSYNTHETICS Polypropylene (PP) Tough, flexible synthetic thermoplastic material made by polymerizing propylene • Similar to polyethylenes, but harder and tougher • Provides good tensile strength relative to its weight • Translucent in its natural state, PP requires additives to create UV stability. • Specific gravity of 0.96 (Floats); Durable, inert • Majority of Nonwovens and Wovens manufactured from PP
- 11. POLYMERS USED IN GEOSYNTHETICS Polyester (PET) Long-chain polymers chemically composed of at least 85% by weight of an ester and a dihydric alcohol and a terephthalic acid • Fabrics and fibers are extremely strong – high tensile at low strains • Very durable: resistant to most chemicals, stretching and shrinking, and abrasion resistant • Hydrophobic (repels water) in nature and quick drying • Polyester used to create high strength to weight products e.g., grids
- 12. GEOSYNTHETICS • Nonwoven - Textile structure produced by mechanical, chemical, thermal, or solvent bonding and/or interlocking of fibers • Woven - Textile structure produced by interlacing two or more yarns, fibers, or filaments • Knit - Textile structure produced by inter-looping ends of yarn • Geogrid - A grid like polymeric material formed by intersecting ribs joined at the junctions used for reinforcement
- 13. FUNCTIONS OF GEOSYNTHETICS • Separation • Confinement • Reinforcement • Filtration • Drainage
- 14. Geosynthetics and MSE Walls – Design Basics TYPES OF GEOSYNTHETICS
- 15. GEOTEXTILES • Any permeable textile used in any geotechnical engineered system • Also referred to as • Filter Fabric • Filter Cloth • Filter Paper • Construction Paper
- 16. NON WOVENS • Advantages • High Flow Rate • Fine Filtration • High Elongation • Flexible • Can Provide Cushion/Protection • Disadvantages • Low Strength to Weight Ratio
- 17. WOVENS • Advantages – High Strength to Weight Ratio – Controlled Filtration – Controlled Flow Rate – Durable – Low Elongation with High Tensile Strength – Installation Resistant • Disadvantages – Can have poor Flow and Filtration
- 18. WOVENS Woven Monofilament polypropylene geotextiles • Filtration • Drainage Woven slit tape polypropylene geotextiles • Separation
- 19. WOVENS High Performance woven polypropylene geotextiles • Subgrade Stabilization • Reinforcement High Performance woven polyester geotextiles • Reinforcement
- 20. GEOGRID Woven / coated polyester - UNI-Axial Extruded / punched drawn PP – BI-Axial • Advantages • High Strength to Weight • High Soil Interaction • Protected Yarns - UNI • High Connection Strength - UNI • Bi-Axial or Uni-Axial Strength • Disadvantages • No Separation
- 21. WHAT’S BEHIND YOUR WALL?
- 22. Geosynthetics and MSE Walls – Design Basics GEOGRIDS
- 23. TYPICAL CHARACTERISTICS OF PET GEOGRIDS • High strength uniaxial polyester geogrid • Strongest geogrid reinforcement available • Woven and coated with a PVC coating • Vast LTDS tensile strength range • 18.5kN/m – 253kN/m • Excellent durability properties • 3.6 meter (12 feet) wide rolls • 1.8 meter (6 feet) wide rolls • 1.2 meter (4 feet)wide rolls
- 24. PET GEOGRIDS • Flexible and Tough • Delivers immediate soil geogrid stress transfer • High Long Term Design Strengths • Long term design strengths are backed up by more than 100,000 hours of creep testing performed at an outside, independent test laboratory • Easy Handling • No sharp edges which may injure workers • No Recoiling • Remains in place after being installed; does not recoil • Cost Effective • Creep resistant polyester fibers provide a higher allowable tensile strength, minimizing the required number of geogrid layers
- 25. GEOGRIDS – WHY POLYESTER (PET) HDPE reinforcement Polyester reinforcement 100 kN/m 75 kN/m 25 kN/m Same Ultimate tensile strength Long term design strength Strain % Log time (s) 21 3 4 5 6 7 10 20 30 1hr 1 d 1yr Polyethylene Polyamide Polyester Polypropylene Creep at 60% load Polyester is the strongest design polymer Analysis of Different High Strength Geosynthetics
- 26. SPECIFYING GEOGRIDS Are extensive independent performance testing studies available? PULL OUT TESTING CREEP TESTING
- 27. SPECIFYING GEOGRIDS Mobilization of high tensile strength at low strain. Wide Range of LTDS (12kNm- 180kNm) Good interlocking and high interface friction. Stable open grid matrix interlocks and Interacts with soil to provide high shearing resistance. The rough surface of grid provides further frictional and shear resistance compared to smooth polyethylene geogrid which relies mainly on interlocking mechanism. High Strength Polyester Geogrid – Benefits High resistance to construction stress. Protective polymer coating for enhanced chemical and mechanical stress resistance. Crusher run Geogrid Interlocking mechanism Tension Load Interface friction 0 20 40 60 80 100 0 2 4 6 8 10 12 14 Strain (%) Percentageofcharacteristicshort-term tensilestrength(%)
- 28. SPECIFYING GEOGRIDS The Geogrid Manufacturer Should • Have a full complement of geosynthetic testing equipment • Be Active in developing and maintaining ASTM standards • Have a GRI-LAP Accredited Laboratory • Be A2LA Accredited • Be ISO 9002 Certified
- 29. SPECIFYING GEOGRIDS “Rumor vs. Fact”’ • Rumor: Polyester geogrids may not be used in recycled concrete soil backfills and high pH soils. • Fact: Geosynthetics have been tested and installed in all soil types. PET geogrids are suitable for all soil types based on proper design. See FHWA Elias technical paper “The effect of pH……of Polyester Geosynthetics”
- 30. SPECIFYING GEOGRIDS Chemical Resistance • PVC coating process binds the molecules for a tighter, stronger bond resulting in superior durability without cracking or spitting (FHWA Montana DOT Study) • PVC is inherently inert to contaminated soils. (Iowa State University …….impervious to gasoline) •Service life beyond 120 years Durability of PET
- 31. SPECIFYING GEOGRIDS Geogrid Creep Testing ASTM D5262 • High Creep Resistance • Over 100,000 hours of creep data • RFCR PET = 1.47 NTPEP (check with mfg.) Design Life Exceeds 100 years
- 32. SPECIFYING GEOGRIDS Creep Rupture Curve : NTPEP
- 33. SPECIFYING GEOGRIDS Independent Evaluation Testing NTPEP Evaluation • Required by most public agencies and DOT’s
- 34. SPECIFYING GEOGRIDS NTPEP Installation Damage Testing Did you know the testing method has changed? ‘Old Test Method’ • 200mm fill lift • Moderately-sized compaction equipment (44 kN) ‘New Test Method’ • 150mm fill lift • Large-sized compaction equipment (111,000 kN)
- 35. SPECIFYING GEOGRIDS NTPEP allows for easy comparison of materials – NTPEP Published Reports Property Tensar Strata Mirafi Creep (RFcr) 2.68 1.49 1.45 Installation Damage (RFID) Type 3 Silty Sand 1.24 1.24 1.05 Durability (RFD) 1.1 1.15 1.15 Total RF 3.66 2.12 1.75 Reduction Factors for Type 3 Backfill (Silty Sand)
- 36. SPECIFYING GEOGRIDS NTPEP allows for easy comparison of materials – NTPEP Published Reports Property Tensar Strata Mirafi Creep (RFcr) 2.68 1.49 1.45 Installation Damage (RFID) Type 1 Coarse Gravel 2.57 1.88 1.61 Durability (RFD) 1.1 1.15 1.15 Total RF 7.58 3.22 2.68 Reduction Factors for Type 1 Backfill (Coarse Gravel) If LTDS of 18.9 kN/m needed: • Tensar – 143.8 kN/m • Strata – 61.09 kN/m • TenCate – 50.46 kN/m
- 37. SPECIFYING GEOGRIDS “Rumor vs. Fact” • Rumor: Need to Specify Ultimate Tensile Strength, 95% of Tult strength, or Junction Strength along with LTDS. • Fact: The design of MSE structures uses LTDS only. There is no design need for specifying ultimate tensile strength, 95% of Tult strength or Junction Strength.
- 38. SPECIFYING GEOGRIDS • Industry accepted method to determine the long term usable strength of a geogrid product • Sample calculation, PET in Coarse Gravel Wide Width Tensile Strength = 50.46 kN/m RFID = 1.61 RFCR = 1.45 RFD = 1.15 (typical soil pH range) LTDS = Wide Width Tensile Strength RFID x RFCR x RFD LTDS = 50.46 / (1.61 x 1.45 x 1.10) = 18.9 kN/m Design Properties
- 39. SPECIFYING GEOGRIDS Design Properties • Industry accepted method to determine the long term usable strength of a geogrid product • Sample calculation, PE Geogrid in Coarse Gravel Wide Width Tensile Strength = 143.8 kN/m RFID = 2.57 RFCR = 2.68 RFD = 1.10 (typical soil pH range) LTDS = Wide Width Tensile Strength RFID x RFCR x RFD LTDS = 143.8 / (2.57 x 2.68 x 1.10) = 18.9 kN/m
- 40. SPECIFYING GEOGRIDS Product Identification • Multiple product labels to ensure easy identification
- 41. SPECIFYING GEOGRIDS PET Geogrids Know what you are getting
- 42. SPECIFYING GEOGRIDS PET Geogrids Know what you are getting Made in NA ISO 9002 Certified manufacturing facility On-site GAI-LAP accredited geosynthetics lab Up to date NTPEP evaluation and report
- 43. SPECIFYING GEOGRIDS PET Geogrids Know what you are getting Product Certification Multiple labels on roll Identification on geogrid itself
- 44. SPECIFYING GEOGRIDS PET Geogrids Know what you are getting Extensive connection data, including sustained load connection testing. Extensive Creep testing, including conventional > 10,000 hours. Installation damage testing with multiple soil types. PET yarns that exceed CEG and MW requirements.
- 45. SPECIFYING GEOGRIDS As a designer, how do you protect yourself? – Thorough and enforceable specifications – Manufacturer QC Program – On-site QA Program
- 46. SPECIFYING GEOGRIDS 1.6 SUBMITTALS A. Submit the following: 1. Certification: The contractor shall provide to the Engineer a certificate stating the name of the manufacturer, product name, style number, chemical composition of the filaments or yarns, manufacturing location and other pertinent information to fully describe the geosynthetic. The Certification shall state that the furnished geosynthetic meets MARV requirements of the specification as evaluated under the Manufacturer's quality control program. The Certification shall be attested to by a person having legal authority to bind the Manufacturer.
- 49. SPECIFYING GEOGRIDS A. Submit the following: 2. Quality Standards: The contractor shall provide to the Engineer the manufacturer’s Quality Control Plan along with their current A2LA, GAI-LAP, and ISO 9001:2008 certificates.
- 51. SPECIFYING GEOGRIDS 1.7 QUALITY ASSURANCE A. Manufacturer Qualifications: The geogrid manufacturer shall have all of the following credentials: Valid NTPEP REGEO report on geogrid material used for this project Geosynthetic Accreditation Institute (GAI) - Laboratory Accreditation Program (LAP) American Association for Laboratory Accreditation (A2LA) ISO 9001:2008 Quality Management System B. The geotextile manufacturer shall have a GAI-LAP accredited laboratory at the location of production capable of performing the ASTM tests as outlined in the specification.
- 52. SPECIFYING GEOGRIDS 1.8 DELIVERY, STORAGE, AND HANDLING A. Geosynthetic labeling, shipment, and storage shall follow ASTM D4873. Product labels shall clearly show the manufacturer or supplier name, style name, and roll number. Product identifications labels, including manufacturers name, product style and roll number shall be included on the outside of the roll packaging material and one the inside of the core of the roll. The material must also be labeled so it is easily identified when deployed.
- 54. SPECIFYING GEOGRIDS 2. Alternate Materials A. Alternate geogrid may be considered if the material meets all of the requirements outlined in this specification. In addition to the submittal requirements already outlined, the contractor shall provide the manufacturers submittal that includes the name and address of the original manufacturer, technical data sheets of the products submitted, installation damage reports from a 3rd party accredited laboratory, creep testing data, including conventional data >10,000 hours, connection testing of the geogrid and block combination being submitted as an alternate.
- 55. SPECIFYING GEOGRIDS • As the designer (Engineer of Record), how do you handle requests for alternate materials? • Geogrid Alternate Materials
- 56. SPECIFYING GEOGRIDS • There are some quick resources that can help you review alternate geogrids. • Website Alternate Materials - Geogrid
- 58. SPECIFYING GEOGRIDS • There are some quick resources that can help you review alternate geogrids. • Website • Geosynthetics Specifier’s Guide Alternate Materials - Geogrid
- 59. SPECIFYING GEOGRIDS Alternate Materials - Geogrid • Suppliers submit material for inclusion. • There is no review or audit of the material submitted.
- 60. SPECIFYING GEOGRIDS • There are some quick resources that can help you review alternate geogrids. • Website • Geosynthetics Specifier’s Guide • Who is the original geogrid manufacturer? • NTPEP Alternate Materials - Geogrid
- 61. SPECIFYING GEOGRIDS • There are some quick resources that can help you review alternate geogrids. • Website • Geosynthetics Specifier’s Guide • Who is the original geogrid manufacturer? • NTPEP • Request actual test data for creep, ID, and pullout. • If PET, request CEG and MW certs. Alternate Materials - Geogrid
- 62. Geosynthetics and MSE Walls – Design Basics MSE WALL COMPONENTS
- 63. WHAT ARE MECHANICALLY STABILIZED EARTH WALLS? • Mechanically Stabilized Earth (MSE) walls are retaining walls or grade separation devices • MSE walls utilize a reinforced soil gravity mass to resist external forces • Reinforced soil is created through the use of horizontal soil reinforcing elements and compacted backfill material.
- 64. COMPONENTS • Soil Reinforcement • Backfill Material • Facing Unit TYPICAL MSE RETAINING WALL
- 65. GEOSYNTHETICS • Uniaxial Geogrids • High Strength Woven Geotextile METALLIC • Steel Grids • Smooth or Ribbed Steel Strips SOIL REINFORCEMENT OPTIONS
- 66. BACKFILL MATERIAL • Gradation Requirements as per AASHTO LRFD Construction Specification Sieve Size Percent Passing (%) 100 mm (4.0 in.) 100 4.25 mm (No. 40) 0 – 60 75 μm (No. 200) 0 – 15 • Free draining, granular material typically recommended for soil reinforcement backfill • Minimum backfill compaction is typically 95% Standard Proctor Maximum Dry Density (SPMDD)
- 67. LONG TERM DESIGN STRENGTH 𝐿𝑇𝐷𝑆 = 𝑇𝑢𝑙𝑡 𝑅𝐹𝐼𝐷 × 𝑅𝐹𝐶𝑅 × 𝑅𝐹 𝐷 Installation Reduction Factors, RFID Geosynthetics Type 1 Backfill Type 2 Backfill Max. Size 4" (100mm) Max Size 3/4" (20mm) D50 about 1-1/4" (30mm) D50 about #30 (0.7mm) HDPE Uniaxial Geogrid 1.20 - 1.45 1.10 - 1.20 PP Biaxial 1.20 - 1.45 1.10 - 1.20 PVC coated PET Geogrid 1.30 - 1.85 1.10 - 1.30 Acrylic coated PET geogrid 1.30 - 2.05 1.20 - 1.40 Woven Geotextiles (PP & PET)a 1.40 - 2.20 1.10 - 1.40 Non Woven Geotextiles (PP & PET)a 1.40 - 2.50 1.10 - 1.40 Slit Film Woven PP Geotextilea 1.60 - 3.00 1.10 - 2.00 a. Minimum Weight 8.0 oz/yd2 (270 g/m2) Creep Reduction Factor, RFCR Polymer Type Creep Reduction Factor Polyester (PET) 2.5 - 1.6 Polypropylene (PP) 5.0 - 4.0 High Density Polyethylene (HDPE) 5.0 - 2.6
- 68. DESIGN CONSIDERATIONS • Wall Height • Wall Batter • Backfill Slope • Surcharges • Water Table Elevation
- 69. Geosynthetics and MSE Walls – Design Basics ANALYSIS OF MSE WALLS
- 70. MSE WALL DESIGN METHODS Design Methods most commonly used and are Industry Accepted Standard of Practice are: • National Concrete Masonry Association (NCMA) • Used most frequently for Private Works • Design Manual “Segmental Retaining Walls” is currently in its Second Edition, although it is currently being revised. • Federal Highway Administration (FHWA) • Used most frequently for Public Works • Design Manual “FHWA NHI-00-043, 044, Mechanically Stabilized Earth Walls and Reinforced Steepened Slopes, Design and Construction Guidelines” is currently in its Second Edition, first Edition was known as “Demo 82” • Developed following AASHTO LRFD Bridge Design Specifications and AASHTO LRFD Bridge Construction Specifications.
- 71. MSE WALL ANALYSIS External Stability Sliding Movement Sliding Resistance Sliding Resistance Sliding Overturning Overturning Movement
- 72. MSE WALL ANALYSIS Bearing Capacity Settlement Movement External Stability
- 73. MSE WALL ANALYSIS Internal Stability Connection Tension Pullout Units Active Wedge Passive Zone
- 74. PULLOUT RESISTANCE 𝑃𝑟 = 𝐹∗ 𝛼 𝜎′ 𝑉 𝐿 𝑒 𝐶 𝑃𝑟 = Pullout Resistance 𝐹∗ = Pullout Resistance Factor 𝛼 = Correction factor 𝜎′ 𝑉 = Effective Vertical Stress at the soil-reinforcement interface 𝐿 𝑒 = The embedment length in the resisting zone behind the failure plane 𝐶 = The reinforcement effective unit perimeter (ex. 𝐶 = 2 for grids) 𝐹∗ = 2 3 tan 𝜑 𝜑 = peak friction angle of soil SOIL TYPE 𝝋 Gravel 30° – 50° Sand and Gravel with fine grained soils 30° – 40° Sand 32° – 50° Silt and Silty Sand 27° – 35° Clay 20° – 30°
- 75. MSE WALL ANALYSIS Internal Stability Overturning Bending Bulging Shear
- 76. MSE WALL ANALYSIS Compound and Overall (Global) Stability
- 77. Geosynthetics and MSE Walls – Design Basics MSE WALL TYPES & FACING OPTIONS
- 78. MSE WALL TYPES TEMPORARY (36 month life span) • Geotextile Wrapped • Welded Wire Mesh / Geotextile PERMANENT • Welded Wire Mesh with Geogrid • Geocell with Geogrid • Binwall with Geogrid
- 80. MSE WALL CONSTRUCTION - WRAPPED FACE STEP 1 1. Check level of base 2. Check all line, grade and curves 3. Place removable form at front of reinforced mass 4. Install first layer of geotextile over removable form Removable form Geotextile Reinforcement Native Soil
- 81. STEP 2 1. Pull Geotextile tight, keep tension applied until backfill is placed. Compacted fill Native Soil Depression for geotextile wrap Removable form 2. Place backfill in specified lifts and compact to 95% Standard Proctor Dry Density. MSE WALL CONSTRUCTION
- 82. STEP 3 1. Wrap geotextile back over compacted fill 2. Place & compact fill above upper wrap portion and level Native Soil Fill on top of geotextile MSE WALL CONSTRUCTION
- 83. STEP 4 1. Place second removable form by repeating step 1. (provide required batter with set back) Native Soil 2. Place second layer of geotextile and reinforced fill by repeating steps 2 through 3. 3. After completion of second lift, remove the first form. MSE WALL CONSTRUCTION
- 84. MSE WALL CONSTRUCTION 1. Repeat steps 1 through 3 until wall is at required height Native Soil Finished Grade
- 85. High Performance Woven Geotextile • Geotextile Wrapped TEMPORARY MSE WALLS
- 86. TEMPORARY MSE WALLS • Wire Mesh / Geotextile Walls
- 87. PERMANENT MSE WALLS • Reinforcement and Fascia
- 88. MSE WALL SYSTEMS Welded Wire Mesh Face / Geogrid Finished Grade Reinforced Soil Zone FOUNDATION SOIL ZONE Native Soil Geosynthetic Reinforcement Welded Wire Fascia
- 89. Wire Mesh with Geogrid (Rock Faced) Cobourg, ON
- 91. Wire Mesh With Geogrid (Vegetated Face) Oakville, ON
- 92. Geogrid ReinforcementFinished Grade Reinforced Soil Zone Foundation Soil Zone Native SoilGeocell Fascia Geocell with Geogrid MSE Walls
- 93. GEOCELL
- 94. GEOCELL
- 96. GEOCELL
- 97. BIN WALL WITH GEOGRID
- 98. BIN WALL WITH GEOGRID Mississauga, ON
- 99. Contact Your Local Sales Rep: www.armtec.com/sales-offices/ Todays Speakers: Michael McQuaid Michael.McQuaid@armtec.com Andrew Lister Mirafi® Geosynthetics, TenCate Geotube®
- 100. UPCOMING WEBINARS For more info please visit www.armtec.com/events Remember – For CPD certificates, send names & emails to webinars@armtec.com! Fall Webinar Series Coming Soon! Stay tuned for updates!
- 101. STAY CONNECTED! Armtec respects your privacy. All communications comply with CASL and general best practices. For more information, you can find links to privacy policy and options to unsubscribe in footer of any emails. On Social Media On armtec.com Webinars Follow us! After the webinar fill out our survey and click yes! Fill out the form at armtec.com and stay up to date on the latest /armtecltd /ArmtecLtd /company/armtec See our presentation on SlideShare and YouTube!
- 102. Contact Your Local Sales Rep: www.armtec.com/sales-offices/ Todays Speakers: Michael McQuaid Michael.McQuaid@armtec.com Andrew Lister Mirafi® Geosynthetics, TenCate Geotube®
Editor's Notes
- Also, as a final reminder, if any of you have been sitting in as a group, please make sure to send in all the names and emails of the attendees so you can get your CPD certificates