Annotated Literature Review for NCHRP Report 640 (2009) / Chapter Skim
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Pages 177-179
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From page 177... ...
175 1.41.3 Materials and Mix Design The only information provided on materials and mix design was that single layer porous asphalt mixes have an 8 mm maximum aggregate size. When two layer porous asphalt layers are used, the top layer has an 8 mm maximum aggregate size and the lower layer of porous asphalt has a 16 mm maximum aggregate size.
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From page 178... ...
176 1.42.2 Benefits of Permeable Asphalt Mixtures The authors did not specifically conduct testing to evaluate the benefits of permeable friction courses; however, benefits of PFCs discussed within the paper include noise reduction and reduced hydroplaning. 1.42.3 Materials and Design This paper does not specifically deal with the design of friction courses; however, the authors state that only modified binders are used for porous friction courses.
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From page 179... ...
177 the removal of the resulting ice layer is much more difficult on porous asphalt surfaces than dense-graded surfaces. The authors state that porous asphalt will require 25 to 50 percent more deicing agents than dense-graded surfaces.
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