Identification of the viscoelastic properties of an asphalt mixture using a scanning laser Doppler vibrometer
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ORIGINAL ARTICLE
Identification of the viscoelastic properties of an asphalt mixture using a scanning laser Doppler vibrometer Navid Hasheminejad . Cedric Vuye . Alexandros Margaritis . Wim Van den bergh . Joris Dirckx . Steve Vanlanduit
Received: 17 June 2020 / Accepted: 30 September 2020 RILEM 2020
Abstract Estimating the master curve of the complex modulus of asphalt mixtures is essential for high quality and sustainable mixture and pavement design. There are multiple standard methods to estimate this master curve using hydraulic-pneumatic testing machines. These methods are complex to perform, need expensive equipment, and have constraints over the geometry of the testing samples. Therefore, the investigation of alternative methodologies to overcome these issues is of importance. In this research, an experimental setup coupled with a back-calculation technique is developed to identify the viscoelastic properties of an asphalt mixture using an optical measurement system. Using this system instead of traditional transducers eliminates the inaccuracies caused due to the attachment of a transducer to the specimen and allows feasible measurements on multiple points of the specimen. The developed method is compared with a standard method and an alternative method based on analytical formulas, and the results exhibit a good level of accuracy at a wide range of frequency and temperature. It is also demonstrated that N. Hasheminejad (&) C. Vuye A. Margaritis W. Van den bergh S. Vanlanduit Faculty of Applied Engineering, University of Antwerp, 2020 Antwerp, Belgium e-mail: [email protected] J. Dirckx Laboratory of Biomedical Physics, University of Antwerp, 2020 Antwerp, Belgium
even though this method can provide the master curve of a specimen with arbitrary geometry, the first natural frequency of the specimen at the highest temperature provides the first data point of the master curve at low frequencies. Therefore, the first natural frequency of the specimen should be considered while selecting the geometry of the test object. Keywords Asphalt mixtures Back-calculation Non-destructive testing Complex modulus Master curve Laser doppler vibrometer Modal analysis
1 Introduction Understanding the mechanical properties of asphalt mixtures is the first step to a high quality, costeffective, and sustainable asphalt pavement design. One of the important mechanical properties of asphalt mixtures is its complex modulus or E ðx; TÞ. This complex value is presented in Eq. 1, with E0 the storage modulus, E00 the loss modulus, and d the phase angle [1]. E ¼ E0 þ iE00 ¼ jE jeid
ð1Þ
European standard EN 12697-26:2018 presents multiple methods to characterize the E . These methods consist of bending, direct or indirect tensile tests on asphalt mixtures with specific shapes (prismatic,
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trapezoidal, or cylindrical) under cyclic sinusoidal or haversine loading [2]. Using the complex modulus of the material at different tempe
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