Asphalt Rubber Technology Information Center
Eight-Year Performance Evaluation of an ARHM Pavement
Larsen, Donald A., P.E.  
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In October 1980, the Connecticut DOT placed an experimental 900-ft section of asphalt-rubber hot mix bituminous
pavement on state route 79 in Madison, CT.  Finely ground rubber was supplied by the Arizona Refining Co. and was
blended with the asphalt (grade AC-20) in the ratio of 1/5 (20% rubber).  The pavement was placed as a 1.5-in. thick
overlay in one lift using conventional paving techniques.  A standard CDOT class 2 bituminous pavement was placed at
the same time and used as a control section.
Engineers from CDOT’s Division of Research monitored the surface condition, skid resistance and roughness during the
period from October 1980 to August 1986, and again in June/July 1989.  In September 1986, it was concluded and
published in a six-year evaluation report that the asphalt-rubber pavement was performing better the standard CDOT
class 2 control mix.  The conclusion was drawn primarily on the basis of the difference in the amount of longitudinal
cracking that had developed during the six-year observation period.
An eight-year evaluation made this past summer indicates that current conditions parallel those reported in 1986.  On the
basis of transverse, longitudinal and alligator cracking, the asphalt-rubber mix continues to perform better than the
control section.  Both the skid resistance and roughness values remain at acceptable levels and are similar for the
control and experimental pavements.
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