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With a nominal torque of 100 Nm all standard but also customised vanes can be applied, allowing for the determination of the undrained shear strength of cohesive soils.

The rotational speed can be adjusted from 0.1° per second up to 40° per second, while the sampling rate can be user defined. The logging and control software communicates with the PLC and allows for the various user input. According to the chosen vane dimension the software monitors the actual torque and calculates the resulting shear forces in MN/m2.
The measured values are graphically visualised in real-time and plotted against the rotational angle or time. Simultaneously all measured values, sample number and time are logged in a separate ASCII file.

Upon completion of the un-drained shear test, the user can easily start a remould test. On a key-stroke the PLC will turn the vane at default or max. speed. After the remould the system will log the residual shear strength at the preset turning speed. The results of both, un-drained and residual shear strength, are presented in a common graph.
The Geomil GVT-100 comes with three standard rectangular vane types (70mm x 35mm, 100mm x 50mm and 150mm x 75mm), the respective vane constants being default values in the logging manue paramters.

Any other vane dimension can be used as well and the corresponding vane constants can be added.
The GVT-100 is optimised for CPT tubes as turning rods (with or without casing tubes as outer casing).