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The ShearTrac III system can perform the consolidation and shearing phases on large size samples under fully automatic control. It is an intelligent shear and load frame combination allowing both vertical and horizontal load and displacement applications. The system incorporates high load capacity motor systems (micro-stepper or servo) that offer superior precision and repeatability.

The ShearTrac III has two main configurations:

• Direct/residual shear testing is performed in a 305 x 305 x 205 mm (12 x 12 x 8 in) shear box for soils/aggregate, rock, and geosynthetics (geomembrane, geotextile, GCL, geogrid, etc.). It can also be used for determining the interface frictional properties of soil and geosynthetics and internal friction of GCLs.
• Static and cyclic direct simple shear is performed on 305 mm (12 in) diameter samples using a Teflon-coated ring stack.

With its unique design, broad range of testing flexibility, and overall ease of use the ShearTrac III is the preferred large shear machine on the market.