United States Department of Transportation
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Abstract:In an attempt to verify the claim that the addition of carbon black to bituminous concrete increases its stability and performance, a test section placed on a deformed bridge deck surface near Altavista and one on Route 360 near Richmond are being evaluated. Marshall tests on samples of the mixtures taken at the time of placement indicated an increase of stability in the experimental mix on only one of the test sections. After 14 months, the mix on the bridge deck is performing satisfactorily with no discernible distortion. It will probably be several years before the performance of the test sections can be used to assess the desirability of using carbon black.
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