NDLI: Numerical analysis of moisture vapor diffusion in asphalt mixtures using digital images

Content Provider	Springer Nature Link
Author	Arambula, Edith Garboczi, Edward J. Masad, Eyad Kassem, Emad
Copyright Year	2009
Abstract	The presence of moisture in asphalt mixtures is detrimental to their performance, e.g., softening the asphalt binder and weakening the aggregate-binder bond. One of the mechanisms of moisture transport, and the focus of this study, is molecular diffusion. Moisture diffusion occurs in response to a concentration gradient. The objective of this study was to estimate the diffusion coefficient of moisture vapor in asphalt mixtures by using finite element (FE) and finite difference (FD) numerical algorithms that employ digital images to discretize the composite. X-ray computed tomography was used to characterize the microstructure of laboratory-prepared specimens and provide the required three-dimensional digital images, which were segmented into three phases: air voids, a mixture of asphalt binder and the fine aggregate fraction, and coarse aggregates. Individual diffusion coefficients were assigned to each phase and the effective diffusion coefficient for the composite was computed using the numerical algorithms. The outcome was compared against experimental values. The effective diffusion coefficient for the asphalt mixtures obtained using the FD method showed closer agreement with the experimental data, while the FE results overestimated the experimental measurements in all cases.
Starting Page	897
Ending Page	911
Page Count	15
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	43
Issue Number	7
e-ISSN	18716873
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-10-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Asphalt mixture Effective diffusion coefficient Moisture vapor diffusion Moisture damage Moisture transport X-ray computed tomography Building Materials Civil Engineering Operating Procedures, Materials Treatment Theoretical and Applied Mechanics Materials Science Structural Mechanics
Content Type	Text
Resource Type	Article
Subject	Building and Construction Mechanics of Materials Materials Science Civil and Structural Engineering

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