Properties of Foamed Asphalt for Warm Mix Asphalt Applications (2015) / Chapter Skim
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Pages 89-103
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89 A P P E N D I X B Draft Commentary on Guidelines Proposed for Revising Appendix to AASHTO R 35 This appendix provides a commentary on the proposed revisions to the appendix to AASHTO R 35 Special Mixture Design Considerations and Methods for WMA based on the results of NCHRP Project 9-53, "Properties of Foamed Asphalt for Warm Mix Asphalt Applications." The commentary provides marked changes to the sections on additional laboratory equipment (X2.3) , technology-specific specimen fabrication procedures (X2.7)
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91 X2.7.6.4. Heat the mixing tools, aggregate, and RAP in accordance with Section X2.7.2.
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92 1. Record the oven-dry weight of the aggregates and RAP, wi.
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93 X2.8.2.2. Compact the specimens at 240°F (116°C)
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94 Introduction The suggested modifications to the appendix of AASHTO R 35 to optimize the foaming water content through the mix design process were presented in Chapter 1. These changes are suggested on the basis of results obtained in NCHRP Project 9-53, "Properties of Foamed Asphalt for Warm Mix Asphalt Applications." The original warm mix asphalt (WMA)
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95 Figure B-1. Final proposed foamed asphalt mix design method.
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96 Table B-1. Summary of characteristics for commercially available laboratory foamers.
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98 Mixing Methods Two methods for producing foamed asphalt mixtures in the laboratory are presented in the proposed appendix to AASHTO R 35 recommended practice. The design of the laboratory foamers included as part of NCHRP Project 9-53 necessitated that these two options be presented.
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99 2012) , and for workability and coatability testing, the mixing time is set at 60 s ± 3 s.
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100 modification) , and aggregate properties (e.g., size, angularity)
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101 Coatability Next, the mixture with the optimum water content is evaluated to ensure that it can provide an adequate coating of binder to the aggregate. Enough of the mixture is prepared to allow the preparation of two specimens.
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102 Figure B-5. Coatability test results for foamed WMA versus HMA.
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103 Manual for Design of Hot Mix Asphalt with Commentary. Transportation Research Board of the National Academies, Washington, D.C.
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