Effects of long-term aging on moisture sensitivity of foamed WMA mixtures containing moist aggregates

Long-term aging of an asphalt mixture is complicated, but can be simulated in the laboratory. The objective of this study was to investigate the influence of long-term aging on moisture susceptibility of foamed warm mix asphalt (WMA) mixtures containing moist aggregate. Weight loss, indirect tensile...

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Bibliographic Details
Published in:Materials and structures 2012, Vol.45 (1-2), p.251-264
Main Authors: Punith, V. S., Xiao, Feipeng, Putman, Bradley, Amirkhanian, Serji N.
Format: Article
Language:English
Subjects:
Aggregates
Applied sciences
Bitumen. Tars. Bituminous binders and bituminous concretes
Building construction
Building Materials
Buildings. Public works
Civil Engineering
Desiccants
Engineering
Exact sciences and technology
Foaming
Foams
Lime
Machines
Manufacturing
Materials
Materials Science
Moisture
Moisture content
Moisture resistance
Original Article
Processes
Solid Mechanics
Theoretical and Applied Mechanics
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Summary:Long-term aging of an asphalt mixture is complicated, but can be simulated in the laboratory. The objective of this study was to investigate the influence of long-term aging on moisture susceptibility of foamed warm mix asphalt (WMA) mixtures containing moist aggregate. Weight loss, indirect tensile strength (ITS) of dry and conditioned specimens, and deformation (flow) were measured for all mixtures. The experimental design included two aggregate moisture contents (0 and ~0.5% by weight of the dry mass of the aggregate); two lime contents (1 and 2% lime by weight of dry aggregate) and one liquid anti-stripping agent (ASA); one foaming WMA additive (Asphamin) and two foaming water contents (2 and 3%); and two aggregate sources. A common long-term aging procedure was used in this study. A total of 64 mixtures were evaluated and 256 specimens were made and tested in this study. The test results indicated that long-term aging improved the moisture resistance of WMA mixtures regardless of the ASA and moisture conditioning. In addition, aggregate source significantly affected the moisture resistance regardless of the foaming technology, ASA, and aggregate moisture content. The mixture with various hydrated lime contents exhibited similar moisture resistance under dry and wet conditions. The liquid ASA used in the WMA mixture showed a weaker resistance to the moisture damage in comparison with hydrated lime.
ISSN:1359-5997
1871-6873
DOI:10.1617/s11527-011-9763-4