Moisture-induced damage resistance, stiffness and fatigue life of asphalt mixtures with different aggregate-binder adhesion properties

[Display omitted] •Aggregate source proved to be relevant for stripping and for moisture-induced damage.•Mixtures with the same base bitumen had stiffnesses differing in asymptotic elastic moduli.•Anti-stripping agent increased fatigue life of the investigated asphalt mixtures.•HMA with better aggre...

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Bibliographic Details
Published in:Construction & building materials 2019-08, Vol.216, p.166-175
Main Authors: Júnior, Jorge L.O. Lucas, Babadopulos, Lucas F.A.L., Soares, Jorge B.
Format: Article
Language:English
Subjects:
Adhesiveness
Asphalt mixture
Fatigue cracking
Moisture damage
S-VECD
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Summary:[Display omitted] •Aggregate source proved to be relevant for stripping and for moisture-induced damage.•Mixtures with the same base bitumen had stiffnesses differing in asymptotic elastic moduli.•Anti-stripping agent increased fatigue life of the investigated asphalt mixtures.•HMA with better aggregate-binder adhesiveness have shown longer fatigue life.•Adhesiveness seems to delay of microcraks when strain amplitudes are small. This study investigated the effects of aggregate-binder adhesiveness on moisture damage and on fatigue life of four different asphalt mixtures. Adhesivemeness was assessed by: (i) qualitative observation of binder stripping from the coarse aggregate’s surface, incremented in this paper with digital image processing, and (ii) modified Lottman test. Fatigue damage modeling was performed, using tension-compression test results. The granitic aggregate produced mixtures with better moisture resistance and fatigue properties when compared to the phonolitic aggregate (same ranking as for aggregate-binder adhesiveness). The same was observed for mixtures with binder containing an anti-stripping agent. It was demonstrated that mixtures with better aggregate-binder adhesiveness have greater fatigue life.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2019.04.241