Source : Webster's Revised Unabridged Dictionary (1913)

Asphaltic \As*phal"tic\, a.
   Pertaining to, of the nature of, or containing, asphalt;
   bituminous. ``Asphaltic pool.'' ``Asphaltic slime.''
   --Milton.

Source : WordNet®

asphaltic
     adj : containing asphalt; "asphaltic residues"