Servo-Pneumatic Universal Testing Machine

The Servo-pneumatic Universal Testing Machine CRT-UTM-NU is a development of the NAT which was developed by Keith Cooper and Professor Steven Brown at the University of Nottingham. The use of a high precision servo-pneumatic valve in conjunction with a low-friction actuator and sophisticated data acquisition and control, results in a performance that is equivalent to servo-hydraulic systems.   

Accurate, digitally generated waveforms are applied by the actuator producing repeatable stress variations in test specimens that are simulative of those in a road pavement due to moving traffic. The actuator is double-acting allowing both compressive and tensile forces to be applied. A triaxial cell system is available for the measurement of the resilient modulus of unbound materials.   

Key Features


  • Low cost dynamic loading universal test system ideally suited to testing asphalt and unbound granular materials.
  • Double acting low friction actuator with integral stroke transducer.
  • Utilises high performance ceramic spool servo-valve.
  • High quality stainless steel frame.
  • Issued with UKAS accredited certificate of calibration for EN 12697-24, EN 12697-25, EN 12697-26.
  • Accessories available to perform a range of standard and non standard test methods.
  • Can be supplied with standard software to perform ENASTM and AASHTO test methods and universal software with which to design non standard test routines.


Key Uses


  • Assessment of resistance to permanent deformation (rutting).
  • Measurement of stiffness modulus.
  • Assessment of resistance to fatigue cracking.
  • Resilient modulus of unbound materials.
  • Mix design.