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Road Materials and Pavement Design Volume 22, 2021 - Issue sup1: EATA2021 – Vienna
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Research Article

Ageing effects on the linear and nonlinear viscoelasticity of bituminous binders

Lucia Tsantilisa Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, Torino, ItalyCorrespondence[email protected]
ORCID Iconhttps://orcid.org/0000-0003-3016-7082
ORCID Icon,
Shane B. Underwoodb Department of Civil, Construction, and Environmental Engineering, North Carolina State University, Raleigh, NC, USAORCID Iconhttps://orcid.org/0000-0002-7223-3968
ORCID Icon,
Fabrizio Migliettaa Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, Torino, ItalyORCID Iconhttps://orcid.org/0000-0003-2925-0268
ORCID Icon,
Pier Paolo Rivieraa Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, Torino, ItalyORCID Iconhttps://orcid.org/0000-0003-1097-8670
ORCID Icon,
Orazio Baglieria Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, Torino, ItalyORCID Iconhttps://orcid.org/0000-0002-1873-872X
ORCID Icon &
Ezio Santagataa Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, Torino, ItalyORCID Iconhttps://orcid.org/0000-0002-5548-4095
ORCID Icon
Pages S37-S50 | Received 29 Jul 2020, Accepted 19 Mar 2021, Published online: 09 Apr 2021
 
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ABSTRACT

The paper investigates the effects of ageing on the linear and nonlinear viscoelastic properties of bituminous binders for paving applications. Four neat binders were analysed in their unaged state and after long-term ageing, which was simulated in the laboratory with the Rolling Thin Film Oven (RTFO) and the Pressure Ageing Vessel (PAV). Amplitude sweep tests and frequency sweep tests were performed to explore the response in the linear domain. Repeated strain sweep tests were carried out to isolate nonlinearity from other mechanisms related to damage. The time–temperature superposition principle and the generalised Maxwell model with a Prony series discretization were used to describe the overall viscoelastic response of binders, introducing strain-dependent shift factors to account for nonlinearity. Results indicate that the adopted experimental and modelling approach allows a proper assessment of the effects of ageing on viscoelasticity.

Disclosure statement

No potential conflict of interest was reported by the author(s).

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