Asphalt Rubber Technology Information Center
Crumb Rubber Modified Asphalt Concrete
Baker, Robert and Connolly, Eileen  
New Jersey  
May, 1995  
Key Words:
Crumb rubber  
This report describes the mix design and air quality asphalt plant emissions testing of crumb rubber modified
bituminous concrete mixes.  The wet process and the dry process were used to incorporate crumb rubber into standard
bituminous concrete mixes, an open graded friction course, a recycled rubber RAP and a propriety gap graded mix.  The
mix gradations are presented for six CRM bituminous concrete pavement resurfacing and lane widening projects.  
Asphalt plant emissions testing data are presented for the projects.  The emissions tests indicated that total
hydrocarbons, carbon monoxide and particulate emissions for two of these mixes were within State of New Jersey
emissions limits.
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