Rheological behavior of bituminous mixtures in the small strain domain is effectively described by the Linear Visco-­‐Elasticity (LVE) theory. Since the response of LVE materials is equivalent to that of Linear Time-­‐Invariant (LTI) systems, material functions that are used to characterize LVE behavior in the frequency domain can be considered as Frequency Response Functions (FRF) of a LTI system. In this experimental research a pseudo-­‐random stress excitation, comprising a broad band of harmonic components, is used to estimate the LVE response function of a bituminous mixture using signals and systems oriented techniques. Cylindrical specimens were tested in tension-compressions configuration, both excitation (stress) and response (strain) signals were analyzed using a spectral analysis. The FRF estimated using pseudo-­random experiments is compared with conventional harmonic analysis results. Advantages and limitations of the proposed approach are highlighted, paying particular attention to the possible effects of non-­‐linearity and viscoplastic deformations.

An experimental approach to the rheological characterization of bituminous mixture based on pseudo-random stress excitations

VIRGILI, AMEDEO;CANESTRARI, FRANCESCO;GRAZIANI, Andrea
2013

Abstract

Rheological behavior of bituminous mixtures in the small strain domain is effectively described by the Linear Visco-­‐Elasticity (LVE) theory. Since the response of LVE materials is equivalent to that of Linear Time-­‐Invariant (LTI) systems, material functions that are used to characterize LVE behavior in the frequency domain can be considered as Frequency Response Functions (FRF) of a LTI system. In this experimental research a pseudo-­‐random stress excitation, comprising a broad band of harmonic components, is used to estimate the LVE response function of a bituminous mixture using signals and systems oriented techniques. Cylindrical specimens were tested in tension-compressions configuration, both excitation (stress) and response (strain) signals were analyzed using a spectral analysis. The FRF estimated using pseudo-­random experiments is compared with conventional harmonic analysis results. Advantages and limitations of the proposed approach are highlighted, paying particular attention to the possible effects of non-­‐linearity and viscoplastic deformations.
RILEM Proceedings
9782351581377
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11566/115071
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