Resonant Column Torsional Shear

Resonant Column Torsional Shear Load Frame / Test System

PDFProduct 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 10-4%. 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
  • ASTM D-4767
  • AASHTO T-297

Testing Capabilities

  • Resonance in torsion
  • Damping Ratio in torsion
  • Torsional shear up to 2 Hz
  • Triaxial or stress path after torsional shear
Request More Information Resonant Column Test Apparatus