RESONANT COLUMN TESTING MACHINE (T813)

Category: Soil

Product Code: T813

Category: SOIL

Sub-Category: CYCLIC

  • Determines small-strain shear modulus (Gmax) and material damping (D) of soils using torsional (and optional longitudinal) resonance under controlled confinement and drainage conditions.
  • Fixed-base architecture with electromagnetic drive and non-contact motion pickup enables clean frequency sweeps, automatic resonance tracking, and half-power bandwidth damping evaluation with high signal-to-noise.
  • Supports saturated and unsaturated testing workflows with cell and back-pressure control for drained/undrained states, including B-value verification during setup.
  • Wide dynamic range covers very small shear strains (~10⁻⁶–10⁻⁴) in resonant column mode; optional torsional shear mode extends characterization to higher strains for modulus/damping degradation curves.
  • Integrated software automates saturation and consolidation staging, frequency step/sweep, amplitude control, resonance identification, and generation of Gmax and D versus shear strain plots.

STANDARDS

ASTM D4015

TECHNICAL SPECIFICATIONS

  • Drive / Pickup: Electromagnetic torsional drive with non-contact motion pickup
  • Frequency Range (RC): 10–300 Hz (typical)
  • Shear Strain Range (RC): ~10⁻⁶ to 10⁻⁴ (typical)
  • Damping Method: Half-power bandwidth
  • Modes: Torsional resonance (standard); longitudinal resonance (optional); torsional shear (optional)
  • Specimen Size (typical): 50 mm Ø × 100 mm H (solid cylinder)
  • Confining Pressure: 0–1000 kPa
  • Back Pressure: 0–1000 kPa
  • Data Acquisition: High-rate logging suitable for resonance characterization and bandwidth analysis
  • Software: Automated sweep/step, amplitude control, B-check, consolidation staging, Gmax & D computation, exportable plots/tables
  • Optional ALFA Cloud integration for secure, real-time data upload, centralized storage, and web access to results.

EQUIPPED WITH

  • Resonant column cell with fixed base, top drive/pickup assembly, and confinement system
  • Pressure/volume control modules for cell and back pressure with de-airing accessories
  • Axial load/displacement channel for static bias and boundary condition control
  • Cabling, tubing, porous stones, and specimen tooling for standard sizes
  • PC control software for resonant column (and optional torsional shear) testing

SUPPLIED WITH

  • Membranes, O-rings, filter papers (assorted for standard specimen size)
  • Essential fittings, hoses, and quick-connects set
  • Starter consumables kit for resonant column specimens

ORDERING INFORMATION

Item Name Item Code
RESONANT COLUMN / TORSIONAL SHEAR TESTING MACHINE (up to Ø 100 mm) T813A10AU
RC/TS MOULD (Ø 100 x 200 mm) T813P001H
RC/TS HOLLOWED MOULD (Ø 100 / 70 x 200 mm) T813P002H

Keywords: resonant column device, ASTM D4015, small-strain shear modulus, damping ratio, Gmax, dynamic soil testing, electromagnetic torsional drive, geotechnical laboratory, pore pressure control, half-power bandwidth, anisotropic consolidation, torsional shear option, soil dynamics equipment