Standards:
AASHTO TP10-1993 Standard test method for Thermal Stress Restrained Specimen Tensile strength
EN 12697-46:2012 Test methods for hot mix asphalt Part 46: Low temperature cracking and properties by uniaxial tension tests
Main Features
- Up to three working stations (electromechanical and/or servo-hydraulic stations).
- Servo-hydraulic actuator: 30 kN static, 25 kN dynamic, double acting, fatigue rated and equal area type with long life Labyrinth bearings & seals.
- DynafloTM Hydraulic Power Supply: Variable
- Frequency Drive 2.2 kW pump motor; Silent operation.
- Ability to clone, modify and/or generate user’s own method file(s) to suit their specific requirements.
- Programmable test Wizard to guide the operator step by step based on a recipe book approach.
- Temperature controller programmed via PC software.
Pavetest versatile TSRST-Multi can be used to evaluate:
...Uniaxial tension stress test (UTST)
...Thermal stress restrained specimen test (TSRST)
...Relaxation time, using the relaxation test (RT)
...Tensile creep tests (TCT)
...Unixial cyclic tension stress test (UCTST)
...Unixial thermal stress & strain test (UTSST)
it requires additional hardware
ACQUISITION:
...Analog inputs are automatically calibrated on power up.
...Simultaneous sampling of all channels.
...16 Analog (±10 Volt) input channels.
...Up to 64 times over sampling (set to 8 by default).
...20 bit digital resolution (no auto ranging required).
...Sampling rate up to 192,000 samples/see.
COMMUNICATION:
...USB or Ethernet
CONTROL:
...High speed, (18 bit) digital servo-control, 4/6 axis.
...Digital closed loop update sampling rate of 2.5 kHz.
...Computer programmable, Proportional, Integral and Derivative (PID) control algorithm.
...Adaptive Level Control (ALC) algorithm for best dynamic peak accuracy.
...3 feedback control modes. E g. force, position and on-specimen strain.
...“Bumpless transfer” between control modes.
Load Frames
...Rigid two column frame
...Width of work space: 240 mm
...Height of work space (between the two platens): 285 mm
Electro-mechanical actuators
...25kN static with ± 50 mm stroke (100 mm)
...Internal displacement transducer
Servo-hydraulic actuator
...30kN static, 25kN dynamic, double acting, fatigue rated, servo hydraulic actuator, equal area type with long life seals & bearings ± 50 mm stroke (100 mm)
...Internal displacement transducer
...Close coupling of servo valve to actuator for best servo performance
...10 μm pressure line filter at actuator for ultimate contamination control
...0.5 lt hydraulic accumulator with 40 Bar pre-charge for best pressure line regulation at servo-valve.
...High response, VCD direct drive, servo-valve: -3 db @ 350 Hz, ± 5% amplitude (performance curves available on request)