United States Department of Transportation
i
Nominal maximum aggregate size for WisDOT specification : [brief].
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2014-03-01
[PDF-232.55 KB]
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Abstract:Research in the area of Superpave mix design has resulted in expansion of the
nominal maximum aggregate size (NMAS) mix designs available and has
established the relationship between NMAS and pavement performance. The
NMAS mixes evaluated by the researchers ranged from 4.75 to 37.5 mm. Current
Wisconsin Department of Transportation (WisDOT) specifications restrict the NMAS of
the standard pavement design structure to 12.5 mm in the upper layer over a 19.0 mm lower
layer, a practice that limits both the products available to designers/contractors and the
flexibility to specify NMAS based on intended application. Recent advances in mix design
at a national level present an opportunity for WisDOT to promote the use of a wider range
of mix types through development of application guidelines for mixes of different NMAS.
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