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Joana Peralta, Loic Hilliou, Hugo Silva, Ana Machado, Jorge Pais, Joel Oliveira
Rheological Quantification of Bitumen Aging: Definition of a New Sensitive Parameter
Appl. Rheol. 20:6 (2010) 63293 (12 pages)
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Bitumen is undoubtedly the most important material in the construction and rehabilitation of flexible road pavements. By
increasing the temperature, bitumen changes from brittle solid, to viscoelastic solid and finally to Newtonian fluid. The rheological
characteristics of bitumen also vary greatly due to aging,which is a phenomenon initiated in the phases of production
and application of bituminous (asphalt) mixtures and continued during the life of road pavements. The aim of this work
is to study several rheological parameters in order to evaluate if they are able to quantify the aging of various types of bitumens.
Four bitumens from the same distillation column in the refinery, but with different penetration grades, were aged by
using the RTFOT method, which simulates the aging of the bitumen during the asphalt mixture production and pavement
construction. The original (base) and aged bitumens were characterized with conventional tests used in the paving industry,
and the results were compared with the rheological characteristics obtained with small amplitude oscillatory shear tests.
Aging was assessed at high temperatures (110 to 180oC) through the activation energy computed from the temperature
dependence of the Newtonian viscosity. However, the comparison of the characteristic relaxation times extracted from master
curves measured at medium/low temperatures (between 25 to 80oC), proved to be the most sensitive indicator of bitumen
aging.
► Cite this publication as follows:
Peralta J, Hilliou L, Silva H, Machado A, Pais J, Oliveira J: Rheological Quantification of Bitumen Aging: Definition of a New Sensitive Parameter, Appl. Rheol. 20 (2010) 63293.
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