The effect of using waste iron slag on the
mechanical properties of hot mix asphalt
concrete mixtures was intensively
investigated within this research. Waste
iron slag that is produced in steel
factories as a byproduct was added to the
asphalt mixture as a part of the fine
aggregate. The studied mechanical
properties include Marshall/stiffness,
indirect tensile strength and unconfined
compressive strength. The effect of iron
slag content on the mechanical properties
of the mixtures was also investigated.
Four asphalt concrete mixtures with
various iron slag contents, namely; 0%,
5%, 10% and 15% by weight of total
mixture were studied. Laboratory testing
has revealed an enhancement in the
compressive strength of asphalt concrete
mixtures when iron slag was used. A
considerable increase in the compressive
strength of the mixtures was observed
with the increase of slag content. No
significant improvement on
Marshall/stiffness and indirect tensile
strength of the mixtures was observed
when slag was used. Even so, iron slag
can still be used in asphalt paving for
enviromental advantages.