SDS-150 Direct Shear Testing System for Soils and Asphalt

  • Closed-loop servo control of double-acting (push/pull) 50 kN (5 ton) shear load actuator with 100 mm (±50 mm) stroke & 50 kN (5 ton) normal load capacity with 50 mm stroke
  • Normal load reaction support mounted on sliding bearings to minimize horizontal friction
  • Accepts 150 mm (6″) square specimens
  • Software for the automatic performance of direct shear tests with constant normal stress or normal stiffness
  • Available interface platens to test soils, asphalt, and geo-membranes
  • Conforms to AASHTO Standard T-236


The GCTS Direct Shear Testing Systems can perform both constant normal stress and constant normal stiffness direct shear tests on either asphalt or soil specimens. These systems feature closed-loop servo control of the shear load and normal load actuators and are complete “turn-key” systems. Through advanced software and hardware, these systems are especially well-suited to test coarse, granular materials and essentially eliminate all vibrations that would disturb specimens during testing.


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