Asphalt Rubber Technology Information Center
Mix Designs and Air Quality Emissions Tests of Crumb Rubber Modified Asphalt Concrete
Document available through TRB
Connolly, E. & Baker, R.F., NJDOT
New Jersey
October, 1994
Emissions, Performance
Key Words:
Air quality; Asphalt concrete; Base course (Pavements); Carbon monoxide; Crumb rubber; Emissions testing; Friction
course; Friction materials; Gap grading; Hydrocarbons; Measurement; Mix design; Mixing plants; Odors; Opacity;
Particulates; Pavement widening; Pavements; Pollutants; Recycling; Resurfacing; Stripping (Pavements); Surface
course (Pavements)
The objective of this study was to develop bituminous concrete mixes with crumb rubber modifier (CRM), to compare
those mixes to the standard mixes and to compare the resulting air quality asphalt plant emissions during production of
the mixes.  With a major emphasis on the reduction of scrap tires being landfilled and stockpiled, the use of the ground
tire rubber from these scrap tires was incorporated in the mixes for the potential to benefit both the long-term pavement
properties and the environment.  Furthermore, the Federal Intermodal Surface Transportation Efficiency Act (ISTEA) and
the State recycling program mandated the study and utilization of scrap tire rubber in highway applications.
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