Resilient Modulus Testing System

Product Code : RMTS

The GDS Resilient Modulus Testing System (RMTS) enables the resilient modulus and permanent deformation of unbound base/sub-base pavement materials to be determined. The system, based around the GDS ELDYN, uses an axially-stiff load frame with a beam mounted electro-mechanical actuator to apply dynamic cyclic axial loads, with a GDS triaxial cell used to confine the test specimen. A number of options are also available for measuring axial deformations, ranging from localised LVDTs to external linear potentiometers.

Key features Benefits to the user
Electro-mechanical load frame: The RMTS load frame supersedes pneumatic actuators in terms of life costs and overall usable performance. Electro-mechanical systems can carry out full load dynamic testing to the stated frequency. Pneumatic systems tend to reduce the available amplitude with load due to the amount of air that needs to be moved from one side of the actuator to the other.
Easy hardware configuration for specific test standards: Numerous RMTS hardware configurations can be selected, enabling resilient modulus and permanent deformation to be determined by following most published test standards. This flexibility allows for a range of specimen sizes to be tested, confining pressure to be measured at various locations, and specimen deformations (axial and radial) to be recorded via localised or external displacement transducers. 
Straightforward test automation via GDSLab test module:
Pre-conditiong, resilient modulus, and permanent test stages can all be automatically performed via the Resilient Modulus test module within GDSLab. 
Axial Load

+/- 5 kN at 5 Hz (upgradeable to +/-10 kN)

Computer Interface


Data Acquisition

16 Bit

Operating Frequency (Hz)

5 (Optional 10)

Pressure Range (MPa)

Depends on triaxial cell size required (1 MPa standard)

Sample Sizes

Depends on triaxial cell size required (38 mm to 150 mm standard)

  • Optional upgrade to static and dynamic triaxial testing (Full ELDYN System), with the addition of back pressure control pore pressure transducer and software modules only.
  • Other upgrade options include user defined waveforms, upgrades from 5 kN to 10 kN, bender element system (Vertical, Horizontal, S and P waves), hall effect local strain transducers, unsaturated soil testing.