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Flexible pavements typically employ asphalt concrete mixtures as surface materials, comprising mineral aggregates, fillers, and bitumen in specific proportions to ensure durability and strength. Over time, heavy traffic and harsh environmental conditions cause deterioration, leading to defects like rutting, cracking, and stripping. Moreover, the increasing production of solid waste and escalating greenhouse emissions pose significant concerns. Utilizing Reclaimed Asphalt Pavement (RAP) materials and agro-industrial waste fillers have become popular for rehabilitating roads and airport pavements due to rising asphalt production costs, scarcity of high-quality aggregates, and environmental considerations. Mineral fillers play a critical role in optimizing hot mix asphalt performance, including binder-aggregate bonding, resistance to moisture damage, and pavement durability. The present study, therefore, aimed to evaluate the performance of incorporating 30% RAP in hot mix asphalt produced with Cement Kiln Dust (CKD) and Rice Husk Ash (RHA) as a partial and full replacement of a conventional mineral filler, granite stone dust. The results showed that the replacement of 75%CKD and 25% RHA was an optimum blend, as it significantly improved Marshall stability, rutting potential, cracking resistance and moisture susceptibility amongst other studied blends of fillers as well as the control mix. The rough texture and angular morphology of CKD may positively affect the strength and durability of recycled hot mix asphalt.
Rikambura et al. (Sat,) studied this question.
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