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. - STAMPA. - PRO90:(2013), pp. 25-32. (Intervento presentato al convegno 1st RILEM International Conference on Rheology and Processing of Construction Materials tenutosi a Paris nel September 2-4, 2013).
An experimental approach to the rheological characterization of bituminous mixture based on pseudo-random stress excitations
VIRGILI, AMEDEO;CANESTRARI, FRANCESCO;GRAZIANI, Andrea
2013-01-01
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
