 
CRT-NU14 - UNIVERSAL SERVO PNEUMATIC TESTING SYSTEMAsphalt ASTM D4123 - ASTM D3497- BS DD 226 EN 12697 24 - EN 12697 25 - EN 12697 26 AASHTO TP62 -AASHTO TP31- AASHTO TP8 Unbound materials AASHTO TP46 - AASHTO T307-NCHRP 1-28A SPT tests Dynamic modulus for permanent deformation Dynamic modulus for fatigue cracking Universal test software Allows user designed test routines that can include multiple wave types and methods of data acquisition
The NU14 is a servo-pneumatic machine for testing asphaltic paving materials. Maximum loading capacity is normally up to 14kN with an air supply of 7 bar. The actuators are double acting which means that both compressive and tensile forces can be applied. This gives a high degree of control over the load waveform and enables loads to be cycled between tension and compression at high frequencies for tests such as bending beam fatigue. •Cycling at frequencies up to 70Hz •14kN static at 7bar (19kN static at 10bar), 9kN at 2.5Hz for modulus tests (This is sufficient for most high modulus materials) •Built in displacement transducer for precise position control •Control & Data Acquisition system with precision 16 bit digital servo-control •Load and force transducers calibrated to United Kingdom Accredited Standards •Transducers available for modulus, permanent deformation and triaxial tests •A wide range of test fixtures is available for asphalt and unbound tests • Triaxial cells for 100mm and 150mm diameter specimens for the testing of unbound materials • Normally supplied with temperature controlled cabinet (-10ºC to +60ºC, ±0.2ºC) • Software to perform American, Chinese and European standard tests • Universal test software routine  The CRT-NU14 can be used for: • Mix design • End product specification • The assessment of new materials • Failure investigation •Pavement assessment SYSTEM ELEMENTS  CRT-NU14. Universal servo-pneumatic asphalt testing system comprising: Rigid stainless steel test frame with adjustable height cross-head Pneumatic actuator with low friction seal and pneumatic servo-valve and integral displacement transducer (14kN maximum static load at 7bar - up to 19kN at10bar) Load transducer (±20kN capacity) Acquisition and control system comprising: • Signal conditioning for load transducer, 2 thermocouples and 2 displacement transducers (optional additional displacement transducer channels) •Servo-amplifier for PID control of servo-valve •Power supplies • Multifunction high speed, 16bit analogue to digital, 16bit digital to analogue and digital input-output card for closed loop computer control of system (National Instruments) • Pneumatic fittings including filter, regulator and tubing • All signal and power cables • Thermocouples • Basic operational and diagnostic software • Instruction manual TECHNICAL SPECIFICATIONS See also: NAT Asphalt Testing System Universal Servo-Hydraulic Test System Four point beam fatigue test Hamburg Wheel tracker Wheel tracker EN12697-22 Large device CRT-WTENLD Roller Compactor |