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Materials Tested

Interface Friction


Geotechnical Testing

Unsaturated Soil


Durability Testing

SAME-DAY Seam Testing

Recycled Plastics


TRI's state of the art interface friction laboratory features 14 large scale direct shear boxes. Our loading capacity ranges from 50 to 40000 lb/ft2 (2-1900 kPa). Our in-house manufactured low load shear boxes provide our clients with improved testing and repeatability of interface shear strengths under cap and construction loading conditions (50-1000 lb/ft2, 2-50 kPa). Continued research in GCL hydration and consolidation, gripping and clamping systems ensures that TRI is the industry leader in interface friction testing.

TRI performs Interface Friction/Direct Shear testing to investigate slope stability:

  • geosynthetic-geosynthetic interfaces
  • soil-geosynthetic interfaces
  • internal GCL shear and GCL interfaces
  • large-scale soil shear strength
  • long-term creep at the interface
  • constant load or constant strain testing

Relevant Standards

ISO 12957

Direct Shear/Interface Friction

ASTM D 5321

Direct Shear/Interface Friction

ASTM D 6243

GCL Internal Shear and GCL Interface Friction