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Mix Design Practices for Warm-Mix Asphalt (2011) / Chapter Skim
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Summary
Pages 1-4

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
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From page 1...
... There are important environmental and health benefits associated with reduced production temperatures including lower greenhouse gas emissions, lower fuel consumption, and reduced exposure of workers to asphalt fumes. Lower production temperatures can also potentially improve pavement performance by reducing binder aging, providing added time for mixture compaction, and allowing improved compaction during cold weather paving.
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From page 2...
... For HMA mixtures with 1.0 percent binder absorption or less, the volumetric properties of WMA designed with the procedures developed under NCHRP Project 09-43 were essentially the same as those obtained from an HMA design. This conclusion supports the current practice of substituting a WMA process into an approved HMA mixture design.
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From page 3...
... Moisture sensitivity as measured by AASHTO T 283 will likely be different for WMA and HMA mixtures designed using the same aggregates and binder. WMA processes that included anti-strip additives improved the tensile strength ratio of some of the mixtures included in the NCHRP Project 09-43 testing and analysis.
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From page 4...
... Although volumetric properties for HMA and WMA will be similar when binder absorption is 1.0 percent or less, the compactability, moisture sensitivity, and rutting resistance of WMA mixture will likely be different than the compactability, moisture sensitivity, and rutting resistance of an HMA mixture designed with the same aggregates and binders. Therefore, it is recommended that the procedures for WMA mixture design developed under NCHRP 09-43 be used when designing WMA mixtures.
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Key Terms

  • wma mixtures
  • draft appendix
  • hma mixtures
  • wma processes
  • mixture design

  • moisture sensitivity
  • mix asphalt
  • rutting resistance
  • wma mixture
  • wma process

  • warm mix
  • compaction temperature
  • mixtures designed
  • production temperatures
  • tensile strength

  • field performance
  • process temperatures
  • reduced production
  • extremely low
  • preliminary procedure

  • binder aging
  • research completed
  • strength ratio
  • wma production
  • wma exceed

  • condition wma
  • wma designed
  • nine wma
  • hma design
  • similar hma


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