Christian-Doppler-Laboratory for performance-based optimization of flexible pavements Institute for Road Construction and Maintenance – Vienna University of Technology Delft – March 2007; Markus SPIEGL 1 Christian-Doppler-Laboratory for Performance-based Optimization of Flexible Pavements, Vienna University of Technology, Austria 4PBT-WORKSHOP Results from 4-Point-Bending Beam Calibration Markus Spiegl

Christian-Doppler-Laboratory for performance-based optimization of flexible pavements Institute for Road Construction and Maintenance – Vienna University of Technology Delft – March 2007; Markus SPIEGL 2 OUTLINE – TEST EQUIPMENT (1/2) servo hydraulic test equipment, with a software for test controlling software DionPro with tools for programming a test procedure software for data analysis (fatigue and stiffness) load cell (accuracy class 0.5) temperature chamber (-25 to +60 °C) frequencies: 0.1 to 40 Hz max amplitude of 0.5 mm at 10 Hz

Christian-Doppler-Laboratory for performance-based optimization of flexible pavements Institute for Road Construction and Maintenance – Vienna University of Technology Delft – March 2007; Markus SPIEGL 3 OUTLINE – TEST EQUIPMENT (2/2) stress and strain controlled tests possible specimen dimensions: surface layers: 50*50*450 mm base layers: 60*60*500 mm 2 LVDTs (± 1.0 mm, accuracy class 1.0) specimen preparation with a segment roller compactor cut on all sides clamps are clued with a two-component adhesive

Christian-Doppler-Laboratory for performance-based optimization of flexible pavements Institute for Road Construction and Maintenance – Vienna University of Technology Delft – March 2007; Markus SPIEGL 4 CHECK OF THE TEST EQUIPMENT Institute for Mechanics and Mechatronics – TU Vienna Research areas: machine dynamics measurement and actuators measurement of vibrations mechatronical systems Verification of test equipment using acceleration sensors and a stroboscope: frequencies (0.1 to 40 Hz) variation of 0.05 Hz resonance frequency of the system 24.5 Hz moving parts translation and frequency (response) asphalt beam

Christian-Doppler-Laboratory for performance-based optimization of flexible pavements Institute for Road Construction and Maintenance – Vienna University of Technology Delft – March 2007; Markus SPIEGL 5 CALIBRATION strain controlled test three different calibration beams twice per year - whole system with all 3 beams twice per year - 2 LVDTs with micrometer screw 10 different frequencies at one temperature sine regression for obtaining dynamic data (amplitude, phase angle,…) stiffness is calculated with the formulas after EN (mistake!!!) beam 1beam 2beam 3 temperature [°C] + 20 frequencies [Hz] 0,1 –1 – 2 – 5 – 8 – 10 – 15 – 20 – 30 – 40 – 0.1 strain amplitude 50 m/m … mass factor [kg] not in [g] … circular frequency [rad/s] and not test frequency in [Hz]

Christian-Doppler-Laboratory for performance-based optimization of flexible pavements Institute for Road Construction and Maintenance – Vienna University of Technology Delft – March 2007; Markus SPIEGL 6 CALIBRATION BEAMS Aluminum 501Aluminum 502Delron 503 stiffness MPa MPa mass kg1.069 kg1.747 kg system mass kg prismatic beam with one bar prismatic beam with two bars beam with a square cross section dimensions [mm] L = 450 L eff = 400 a = 130 w = 10 h = 50 L = 450 L eff = 400 a = 130 w = 2 x 5 h = 50 L = 450 L eff = 400 a = 130 b = 50 h = 50

Christian-Doppler-Laboratory for performance-based optimization of flexible pavements Institute for Road Construction and Maintenance – Vienna University of Technology Delft – March 2007; Markus SPIEGL 7 DOKUMENTATION test report date operator code of beam E*, E1, E2 and phase angle diagram

Christian-Doppler-Laboratory for performance-based optimization of flexible pavements Institute for Road Construction and Maintenance – Vienna University of Technology Delft – March 2007; Markus SPIEGL 8 CALIBRATION RESULTS – BEAM 501

Christian-Doppler-Laboratory for performance-based optimization of flexible pavements Institute for Road Construction and Maintenance – Vienna University of Technology Delft – March 2007; Markus SPIEGL 9 CALIBRATION RESULTS – BEAM 502

Christian-Doppler-Laboratory for performance-based optimization of flexible pavements Institute for Road Construction and Maintenance – Vienna University of Technology Delft – March 2007; Markus SPIEGL 10 CALIBRATION RESULTS – BEAM 503

Christian-Doppler-Laboratory for performance-based optimization of flexible pavements Institute for Road Construction and Maintenance – Vienna University of Technology Delft – March 2007; Markus SPIEGL 11 good function of test equipment check through verification tests by the Institute for Mechanics and Mechatronics rotation and translation (movies) stiffness values corresponding to producer specification good repeatability E* standard deviation less than 0.5 % test equipment fulfills the requirements of the EN CONCLUSIONS

Christian-Doppler-Laboratory for performance-based optimization of flexible pavements Institute for Road Construction and Maintenance – Vienna University of Technology Delft – March 2007; Markus SPIEGL 12 Thank you for your attention !