Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/12381
Title: Effects of aging on the properties of asphalt at the nanoscale
Authors: Wang, Y 
Zhao, K
Glover, C
Chen, L
Wen, Y
Chong, D
Hu, C
Keywords: Asphalt
Atomic force microscopy
Micromechanical properties
Oxidative aging
Issue Date: 2015
Publisher: Elsevier
Source: Construction and building materials, 2015, v. 80, p. 244-254 How to cite?
Journal: Construction and building materials 
Abstract: Conventional rheological and chemical tests provide a global view of asphalt property and composition changes upon aging, but offer little details on the changes at the microscopic level. Using atomic force microscopy (AFM), this study analyzed the micromechanical properties of five asphalts with different aging conditions. Rheological and chemical tests were also used to characterize the global properties of the asphalts. Aging was found to significantly increase the spatial variations of the sample properties. It generally increases the ratio between the dissipated energy and total work to deform the sample during the indentation process by AFM probe. It also appears to increase the adhesive and/or cohesive strength of the sample. Certain micromechanical properties and the rheological properties are well related. The asphaltenes content and the size of microstructures both appear to affect the micromechanical properties of the binders. AFM provides a promising addition to the traditional rheological test for asphalts, but more studies are needed to connect the micromechanical properties with performance-related properties.
URI: http://hdl.handle.net/10397/12381
ISSN: 0950-0618
DOI: 10.1016/j.conbuildmat.2015.01.059
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