Servo-Pneumatic Universal Testing Machine
Rapid determination of modulus, permanent deformation and fatigue of bituminous mixtures using cylindrical specimens that are cored from the highway or prepared in the laboratory

This machine 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 equal to many 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.



  • EN 12697-26 Annex C
  • EN 12697-26 Annex D & E
  • ASTM D7369
  • ASTM D4123
  • ASTM D3497
  • AAASHTO T324 (ex TP62) / T378 (ex TP79)

    Permanent Deformation:

  • EN 12697-25 Methods A & B
  • Fatigue:

  • EN 12697-24 Annex E
  • ASTM D7313 DCT (Disc shaped compact tension test)
  • EN 12697-44 SCB (Semi circular bending test)

    Simple Performance Tests:

  • Flow number
  • Flow time
  • NCHRP9-19; NCHRP9-29

    Unbound Materials:

  • AASHTO T307 (previously TP46)
  • NCHRP 1-28A
  • 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 EN, ASTM 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


  • 20 bit resolution, 5kHz per channel
  • Will accept any voltage transducer in any channel using TEDS Thermocouples
  • 1024 data points per cycle
  • Up to 16 digital input & output channels
  • Ethernet/USB/RS232 to PC communication


  • User friendly, intuitive and reliable Windows software developed using LabVIEW
  • Standard test software available to meet specific EN, ASTM and AASHTO test methods
  • Universal test software for the development of test methods using static, sinusoidal, haversine, square, triangular with user selected frequencies and data collection rates
  • Stored test data can be imported into a spreadsheet package to be analysed by the user
  • Utilities are included for transducer check, diagnostic routines and calibration
  • DIMENSION-Software

    *cDAC & Dimension optional. Please enquire for details.

    Maximum Load Electronically limited to 15.5kN
    Load Transducer ±20kN
    Actuator Stroke mm 30
    Frequency Hz 0 to 30
    Electrical Supply¹ 220-240 Volts 50 Hz @ 13A
    Compressed Air 7-10 bar at 600 L/min
    Dimension mm (WxDxH) Frame 360 x 400 x 740
    Control Box 360 x 280 x 140
    Working space required mm (WxDxH) 825 x 1650 x 2100 when fitted in cabinet CRT-TCC
    Estimated Weight Kg Frame 30
    Control box 6
    PC Included

    ¹ others available upon request

    Calibration & Maintenance

    Calibration, Annual Service and Maintenance Contracts are available for this device. UKAS accreditation to satisfy typed testing as described in EN 13108. Please enquire for further details. Note: This device should be checked and calibrated annually.

    Accessories are not included in the price of main device (unless stated otherwise) and may be purchased separately if required.

    Indirect tensile stiffness modulus and fatigue measurement system to perform
    EN 12697-26 (Annex C) and EN 12697-24 (Annex E) *. More Details
    Resilient modulus test system to perform AASHTO TP31 and ASTM D4123. More Details
    D7369-4 CRT-D7369
    Resilient modulus test system to perform ASTM D7369. More Details
    Test system to perform dynamic modulus according to AASHTO T342 (ex TP62) / Simple Performance Test. More Details
    Dynamic and static creep measurement system to perform EN12697-25 (Method A) and DD226. More Details
    Dynamic and static creep(Flow) measurement system with confining stress to perform EN12697-25 Method B. More Details
    Direct Compression and Tension measurement system to perform EN12697-26 Annexes D&E (DT-CY/CT-PR/DTC-CY) for CRT-UTMs. More Details
    CRT-T307 CRT-T307
    Triaxial system to perform AASHTO T307 on 200mm * Ø100mm specimens of unbound material. More Details
    CRT-T307+ CRT-T307+
    Triaxial system to perform AASHTO T307 on 300 mm * Ø150 mm and 200 mm * Ø100 mm specimens of unbound material. More Details
    Temperature Controlled Cabinet CRT-TCC
    Temperature controlled cabinet. More Details
    Photo? N.A CRT-COMP0650
    Standard air compressor (upto 7bar and 600 L/m) for supply of air to CRT-UTM-NU
    Photo? N.A CRT-FT06-AIRDRYER
    Air dryer with 600 L/s flow rate and 3°C dew point
    Please complete the form below to download the datasheet