Effects of Aging on Micromechanical Properties of Asphalt Binder Using AFM
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 5
Abstract
The performance of an asphalt binder is closely related to its microstructure. Understanding the properties of asphalt binders at the nano/microscale may help to improve knowledge of their macroperformance. The emergence of atomic force microscopy (AFM) technology makes it possible to distinguish the microstructural and micromechanical properties of asphalt binder. In this paper, the effects of aging and modifiers on the micromechanical properties of asphalt binder were investigated by using AFM peak force quantitative nanomechanical mapping (PFQNM) mode. Four different virgin asphalt binders and one styrene-butadiene-styrene (SBS)-modified asphalt binder subjected to different aging conditions were considered. It is found that the variation of morphology of bee structures relates to the penetration grade. The Derjaguin-Muller-Toporov (DMT) modulus fluctuates violently inside the bee structure. With the increasing aging degree of asphalt binders, the DMT modulus for three phases (catana, peri, and para phases) all increase correspondingly. Moreover, the addition of modifier improves the microscopic properties of asphalt binder.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request.
Acknowledgments
The work described in this paper is supported by the National Natural Science Foundation of China (Nos. 51922079, 61911530160), Shanghai Pujiang Program, the Fundamental Research Funds for the Central Universities, and Open Foundation of State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, China.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 5 • May 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Sep 18, 2018
Accepted: Jul 22, 2019
Published online: Feb 25, 2020
Published in print: May 1, 2020
Discussion open until: Jul 25, 2020
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