  New plans should be used to improve quality and to increase productivity and
durability of conventional pavements. In this investigation, it has been
attempted to promote technical characteristics of bitumen using carbon
nanotubes as an additive. Wet and dry process methods are most practical ways
of mixing CNF in AC. It was decided that the best method to adopt for this
investigation was the dry process. In this study thermal and ductility
properties of modified bitumen by 0.1, 0.5, and 1% carbon nano-tube content in
bitumen were evaluated considering bitumen penetration, softening point, and
ductility tests, then the results were compared to those of unmodified bitumen.
It was found that adding carbon nano-tubes effects on thermal properties of
bitumen by increasing the softening point and decreasing the bitumen
penetration. It was also shown that bitumen ductility decreases by carbon
nano-tubes modification process.
