United States Department of Transportation
i
Comprehensive evaluation of the long-term performance of rubberized pavement, phase I : laboratory study of rubberized asphalt mix performance.
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2012-12-01
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[PDF-2.07 MB]
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Abstract:Crumb rubber, made from scrap tires, has been introduced into the production of different types of hot
mix asphalt (HMA) in either a wet or dry process. In the wet process, the crumb rubber and binder are
completely mixed to form asphalt rubber (AR), which is then mixed with aggregates in a drum. In the
dry process, the crumb rubber is mixed directly with aggregates in the drum to produce an HMA
called rubberized asphalt mix. This paper examines the long-term performance of porous European
mix (PEM) and stone matrix asphalt (SMA) pavements to which crumb rubber was added in the dry
process. Test sections were visually inspected for surface distress, following the guidelines in the
Georgia Department of Transportation (GDOT) Pavement Condition Evaluation System (PACES)
manual. Core samples were evaluated in the laboratory on selected physical and durability properties,
including the void ratio, permeability, density, Cantabro loss, and Marshall stability Visual inspection
results show that the performance of rubberized pavement almost equals that of polymer-modified
PEM with no rutting, raveling, or cracking, while the Cantabro test showed a higher mass loss after 3
years’ service. After 5 years’ service, the rubberized pavement performed slightly better to rutting
depth, while other visual indicators remained the same. The rubberized SMA pavement had slightly
higher Marshall stability and lower flow than the control SMA pavement, with similar effects on the
polymer-modified PEM’s surface performance.
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