United States Department of Transportation
i
Hot mix asphalt research investigation for Connecticut : part A - reduction in the number Of superpave mix design levels.
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2009-07-01
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[PDF-990.67 KB]
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Abstract:This research is the first in a series of investigated topics surrounding hot mix asphalt in Connecticut.
Currently there are at least 12 different mix designs that need to be developed by producers of HMA with
four traffic levels and three nominal maximum aggregate sizes. This can cause undesirable delays in
production when plants switch between mixes to accommodate customers’ orders. This research focuses
on the impacts of reducing the number of mix designs that are necessary without compromising the longterm
integrity and performance of pavement. Testing took place in the laboratory utilizing HMA
performance testing equipment. Rut depth differences for design Levels 2, 3 and 4 were insignificant,
showing Superpave mixes in Connecticut are quite capable of withstanding loading from traffic without the
use of design Level 4. Level 3 with an elastomeric polymer modified binder may be substituted for design
Level 4 in areas with rutting problems. See report for other recommendations.
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