Abstract:
Hot mix asphalt needs to be developed to resist particular permanent deformations like rutting and thermal
cracking due to increased traffic volumes and vehicle loads. Additives such as carbon black, graphite, carbon fibers are
used in the mixture or the binder for improving the mechanical features of asphalt. In this article, the effects of graphite
used for developing the mechanical properties of asphalt have been investigated in mixtures tests. Therefore, Marshall
stability, indirect tensile stiffness modulus and indirect tensile fatigue tests were performed to bituminous mixtures
modified with three different proportions of graphite by weight of bitumen. Stone mastic asphalt mixtures which were
manufactured with pure and modified bitumen were aged in different time intervals in the oven. In conclusion, it has
defined that Marshall stability values have declined. It has been determined that there is no significant difference in the
time-dependent deformation behavior of the original and aged samples in pure and different graphite content although
the stiffness modulus and load repeat number of the samples increased with the rise of the aging time. These results
shown that graphite generally used for improving the thermal properties in literature were also determined to contribute
to mechanical properties of mixtures.
