Asphalt Rubber Technology Information Center
Feasibility of Crumb Rubber Use for Asphalt Pavement Construction in Rhode Island
Document available through TRB
Madapati, Raghu Ram; Lee, K. Wayne; Manning, Francis J. and Franco, Colin A.  
Rhode Island  
December, 1995
Key Words:
Asphalt rubber; Binder content
There are two processes of adding crumb rubber modifier to hot mix asphalt, that is , the wet process and the dry
process; and different technologies are available for each process.  On the basis of the results of the binder study and
producer’s practices, HMA specimens were prepared using two selected AR binders with the producer R and A CRMs
Rhode Island dense-graded and dense-graded friction course mixtures, respectively.  Aggregates procured from four
local asphalt contractors were used.  In addition, gap-graded HMA specimens were prepared with 3 percent CRM and
control AC binder with typical local aggregates using the dry process.  Marshall mix design was performed on all
mixtures to determine optimum binder content and Marshall properties.
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