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

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Abstract

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.

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Acknowledgements

Financial support was made through a grant from South Carolina’s Department of Transportation (SCDOT) and the Asphalt Rubber Technology Service (ARTS) of Clemson University.

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Authors and Affiliations

  1. Department of Civil Engineering, Clemson University, Clemson, SC, 29634-0911, USA

    V. S. Punith & Bradley Putman

  2. Asphalt Rubber Technology Service (ARTS), Department of Civil Engineering, Clemson University, Clemson, SC, 29634-0911, USA

    Feipeng Xiao

  3. Key Laboratory of Silicate Materials Science and Engineering of Ministry of Education, Wuhan University of Technology, Wuhan, 430070, China

    Serji N. Amirkhanian

Authors
  1. V. S. Punith
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  2. Feipeng Xiao
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  3. Bradley Putman
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  4. Serji N. Amirkhanian
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Correspondence to Feipeng Xiao.

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Punith, V.S., Xiao, F., Putman, B. et al. Effects of long-term aging on moisture sensitivity of foamed WMA mixtures containing moist aggregates. Mater Struct 45, 251–264 (2012). https://doi.org/10.1617/s11527-011-9763-4

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  • DOI: https://doi.org/10.1617/s11527-011-9763-4

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