Many of the asphalt pavement structures in Egypt are exposed to granular
disintegration due to a lack of filler properties, which has a negative effect on both the
economy and road safety. This paper investigates and evaluates the application of
cement dust waste produced from the cement industry and Ordinary Portland Cement
(OPC) as a filler material in hot mix asphalt (HMA). A Marshall Test was conducted
to study the stability, flow, bulk density, air voids, voids in mineral aggregate and voids
filled with bitumen (VFA) for controlled hot asphalt mixtures and modified mixtures
at various filler material contents. Different ratios of the investigated filler materials
were used to study their effect on the mechanical properties and strength of the mix.
Experimental results showed that replacement of OPC or cement dust instead of
traditional mineral filler offered new HMA with higher stability, bulk density and VFA
and lower flow compared with the control mixture. The Marshall stability
corresponding to the optimum ratio of suggested filler is used in BISAR program to
determine different responses for flexible pavements. Stress, strain and displacement in
the x-y and z-directions were included to design the modified hot-mix asphalts.
Ultimately, the introduction of the two investigated filler materials improved obviously
both mechanical properties and strength of the asphalt pavement structure.
Additionally, using wastes such as cement dust as alternative materials in the highway
industry could offer many advantages, such as improving the performance of asphalt
pavements, reducing the cost of highway structures, and being environmentally
friendly.