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Flexible Pavement Optimization Using Advanced Testing Equipment

Explore the research on optimizing flexible pavements by Markus Spiegl at Vienna University of Technology. Learn about the innovative testing equipment, calibration methods, and verification processes. Discover the impact on pavement performance.

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Flexible Pavement Optimization Using Advanced Testing Equipment

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  1. Christian-Doppler-Laboratory forPerformance-based Optimization of Flexible Pavements, Vienna University of Technology, Austria • 4PBT-WORKSHOP • Results from 4-Point-Bending Beam Calibration • Markus Spiegl 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 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 LVDT’s (± 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 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 • http://www.mdmt.tuwien.ac.at • 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 Delft – March 2007; Markus SPIEGL

  5. w … circular frequency [rad/s] and not test frequency in [Hz] m … mass factor [kg] not in [g] 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 12697-26 (mistake!!!) Delft – March 2007; Markus SPIEGL

  6. CALIBRATION BEAMS Delft – March 2007; Markus SPIEGL

  7. DOKUMENTATION • test report • date • operator • code of beam • E*, E1, E2 and phase angle • diagram Delft – March 2007; Markus SPIEGL

  8. CALIBRATION RESULTS – BEAM 501 Delft – March 2007; Markus SPIEGL

  9. CALIBRATION RESULTS – BEAM 502 Delft – March 2007; Markus SPIEGL

  10. CALIBRATION RESULTS – BEAM 503 Delft – March 2007; Markus SPIEGL

  11. CONCLUSIONS • 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 12697-26 Delft – March 2007; Markus SPIEGL

  12. Thank youfor your attention !mspiegl@istu.tuwien.ac.at Delft – March 2007; Markus SPIEGL

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