What is it about?
Sinusoidal excitations are normally used to elicit the linear viscoelastic (LVE) response of bituminous mixtures. In this study we propose an original approach to the measurement of the complex Young's modulus and Poisson's ratio using a pseudo-random multi-frequency excitation.
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Why is it important?
We propose a measurement and analysis technique based on the formal analogy between linear time-invariant (LTI) systems and LVE materials. Since sinusoidal signals pass through LTI systems independently of each other, LVE materials do not need to be excited separately at each frequency. In fact, we estimated the complex Young's modulus and Poisson's ratio exciting the material with a generic random signal composed of a broad band of frequencies.
Perspectives
Writing this paper was a challenging experience. I tried to write down in a straightforward way a few concepts which are not familiar to most pavement engineers, including myself. I think that random wave testing can be carried out with a simple software update to a standard testing press and thus is a promising alternative to the classical sinusoidal testing procedure.
Andrea Graziani
Universita Politecnica delle Marche
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This page is a summary of: Linear viscoelastic characterisation of bituminous mixtures using random stress excitations, Road Materials and Pavement Design, March 2019, Taylor & Francis,
DOI: 10.1080/14680629.2019.1587494.
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