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.
Standard
EN 12697-24 Annex E
EN12697-25 Method A and B
EN 12697-26 Annex C and E
ASTM D4123
ASTM D7369
ASTM D7313
ASTM D8044
AASHTO TP31
AASHTO TP62
AASHTO TP 105
AASHTO TP124
AASHTO T307
AASHTO T322
AASHTO T342
NCHRP 9-19
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