Materials Testing Systems Field Monitoring Systems Pavement Instrumentation Monitoring Rentals

Resonant Column Torsional Shear Load Frame / Test System

PDFResonant Column Product Specification PDFSample Geotechnical Report

LoadTrac-II/FlowTrac-II RC-TS

Geocomp's resonant column and torsional system is based on the Long-Tor Resonant Column Apparatus developed by Dr. Vincent P. Drnevich (patent 1974) at Purdue University. The LoadTrac-II/FlowTrac-II RC-TS system is a fully automated system designed to measure the shear modulus and damping of soils at strains down to 10-7. The unit completely automates saturation, consolidation, resonant column, torsional shear, and stress-path test phases. The system consists of a computer-controlled unit that utilizes an oscillator motor to apply cyclic torsional loading to the top of the specimen for a range of excitation levels. Unlike other systems, a direct torque measurement is made at the bottom of the specimen to completely eliminate issues of back emf. Resonant column and torsional shear testing can also be followed by a stress-path triaxial test. The system is capable of displaying the current status of a test and graphically portraying the progress of the test in real time.

Applicable Test Standards

  • ASTM D4015, D4767
  • AASHTO T 297


  • Resonance in torsion
  • Damping Ratio in torsion
  • Torsional shear up to 2 Hz
  • Triaxial or stress path after torsional shear
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