Large ShearTrac III

ShearTrac III

The ShearTrac IIITM system is capable ofperforming the consolidation and shearing phases of a 305 mm x 305 mm (12 x 12 in. by 200mm(8.0 in) height direct shear test under automatic control for soils and geosynthetics (geomembrane, geotextile, GCL, geogrid, etc.) as well as for determining the interface frictional properties of soil and geosynthetics, and internal friction of GCLs.

The system consists of a computer controlled unit that utilizes a micro stepper motor to apply the horizontal loads. Versions of the unit are available to test loads up to 50 kN (10,000 lbs). Built-in electronics control test and display data in real time. The system is capable of applying a constant rate of strain or stress at any displacement rate up to 15mm (0.6 inch) per minute. The computer controlled program runs under latest Windows. It includes the capability to display the current status of latest and graphically portray the progress of the test in real time. The system also includes the capability for the operator to alter the test process and conditions at any stage during the test.

This is a turnkey system that includeshardware and software for recording all test input data and settings of selected test parameters, performing standard engineering calculations on the data, and producing graphically plotted and printed output in the standard Corps format, in accordance with ASTM D5321, D6243 and BS 1377 standards. 


Built-in end clamps for geosynthetics testing

Optional grip plates for true internal friction determinationfor GCLs

Linear bearings for minimum horizontal friction

Two sets of limit switches to prevent over traveling

Built-in 4-channel data acquisition with 16-bit resolution

Two LCD display

Two displacement transducers with 100 mm (4.00 in.) range and 0.002 mm (0.00008 in.) resolution

Two universal shear web type load cells

Accurate displacement rate control from 0.00003 to 10mm per minute (0.000001 to 0.4 in. per minute)

Built-in electronic controls for automatic display of dataand control of test

Windows XP, or Vista, 7 friendly user interface

Fully incremental consolidation test capability 


ASTM D-5321 and D-6243

ASTM 3080/T236

BS 1377 


CAPACITY50 kN(10,000 lbs.)
VERTICAL MOTORStepper motor with built-in controls for vertical load
HORIZONTAL MOTORStepper motor with built-in controls for horizontal load
SPEED RANGE0.00003 to 10mm per min. (0.000001 to 0.4 in per minute)
HORIZONTAL TRAVEL90 mm (3.5 in.) resolved to 0.002 mm (0.00008 inches)
VERTICAL TRAVEL90 mm (3.5 in.) resolved to 0.002 mm (0.00008 inches)
POWER110/220 V, 50/60 Hz, 1 phase
ST-1000050 kN (10,000 lbs.) frame capacity in both directions.
Geo-NETTM-PCNetwork card and cable to link ShearTrac III to PC
SHEARSoftware package to automatically run consolidation and direct shear test on ShearTrac III
SHEAR.REPORTEditing/reporting software package
GRIPPING PLATESOptional for GCL testing

For viewing forms of the report and the interface of the operating program click the mouse on a corresponding miniature.