Materials Testing - Universal

CRT-UTM-NU Servo-Pneumatic Universal Testing Machine
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
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 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.

CRT-UTM-HYD Servo-Hydraulic Universal Testing Machine
The Servo-Hydraulic Universal Testing Machine (CRT-UTM-HYD) is a well designed, inexpensive machine
specifically developed for the testing of materials used in pavement construction.

A motorized, adjustable crosshead reduces the time between test setups. The programmable temperature
cabinet provides the possibility to perform frequency/temperature sweeps. Accurate waveforms are
digitally generated and applied by the actuator producing repeatable conditions that are simulative of
those created by moving or static vehicles. The actuator is double-acting allowing both compressive and
tensile forces to be applied. Various systems are available for the measurement of the modulus of
unbound materials.

Key Features
Designed to perform a range of tests on asphaltic paving materials, sub-grade soils and granular sub-base materials.
Double acting fatigue rated hydraulic actuator with integral stroke transducer.
Utilises Star servo valve with ‘Sapphire Technology’.
Motorised adjustable lower crosshead with automatic hydraulic frame clamping.
Integral programmable temperature controlled cabinet.
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.