Rheological and chemical properties of field aged binders and their variation within the wearing course

Field ageing is investigated based on recovered binders. Fifteen sections were considered, consisting of unmodified and polymer-modified binders (PmB). Binders were recovered from the wearing course, after slicing the cores horizontally. To assess field and laboratory ageing tendencies, recovered bi...

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Bibliographic Details
Published in:Road materials and pavement design 2022-08, Vol.23 (S1), p.36-54
Main Authors: Soenen, H., Carbonneau, X., Lu, X., Robertus, C., Tapin, B.
Format: Article
Language:English
Subjects:
ageing profile
Aging (artificial)
Asphalt mixes
carbonyl
Carbonyls
Chemical properties
Delta T
Field ageing
Glover-Rowe
Rheological properties
rheology
Stiffness
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Summary:Field ageing is investigated based on recovered binders. Fifteen sections were considered, consisting of unmodified and polymer-modified binders (PmB). Binders were recovered from the wearing course, after slicing the cores horizontally. To assess field and laboratory ageing tendencies, recovered binders were compared to a set of reference binders, tested before and after laboratory ageing. For three sites, the binders recovered from bottom slices were long-term aged and compared to the properties of top slices. Stiffness-based rheological parameters showed good relations to the carbonyl index. Field and laboratory ageing induced the same trends, but field ageing often turned out to be more severe. It was shown, for three sections, that a standard ageing test applied to the bottom slices is not enough to reach the ageing levels of the top slices. Finally, a relation between the vertical ageing profile and the void content of the corresponding asphalt mixtures was observed.
ISSN:1468-0629
2164-7402
DOI:10.1080/14680629.2021.1994450