Geosynthetic Accreditation Institute


ASTM D5321
Test Method for Determining the Coefficient of Soil and Geosynthetic or Geosynthetic and Geosynthetic Friction by the Direct Shear Method (04.08)


List of Accredited Laboratories:

  • Lab. #1 - TRI/Environmental
  • Lab. #3 - Golder Associates
  • Lab. #4 - Geosynthetic Institute
  • Lab. #5 - NTH Consultants, Ltd.
  • Lab. #6 - GeoSystems Consultants
  • Lab. #11 - STS Consultants
  • Lab. #13 - Precision Geosynthetic Laboratories, CA
  • Lab. #14 - Geotechnics, Inc.
  • Lab. #18 - Shaw Environmental & Infrastructure, Inc.
  • Lab. #19 - HTS Inc., Consultants
  • Lab. #20 - GeoTesting Express
  • Lab. #22 - CETCO (Arlington Heights Lab)
  • Lab. #29 - FITI  
  • Lab. #32 - Vector Engineering, Inc.
  • Lab. #34 - GSE Lining Technology (Richey Road Lab)
  • Lab. #38 - SAGEOS/CTT Group
  • Lab. #41 - SGI Testing Services, LLC
  • Lab. #42 - NPUST (GSI-Taiwan)
  • Lab. #43 - Ardaman & Assoc.
  • Lab. #46 - Bentofix Technologies, Inc.

[Method List]

[Laboratory List]

[GAI page]