Effect of Different Filler Types on Mechanical Properties of CMA

Although conventional hot mix asphalt (HMA) has good performance, it has many drawbacks, such as gas emission into the environment, high energy for preparation and compaction, and difficulty controlling temperature for long transfer distances. Therefore, some sustainable technologies, such as cold-mix asphalt (CMA), are used. This study aims to develop cold mix asphalt (CMA) using by-products and waste materials. The methodology for this study included using four types of filler material: CKD (cement kiln dust), OPC (ordinary Portland cement), SF (silica fume), and RH (rice husk) as fillers. Laboratory tests were performed to assess the volumetric and mechanical characteristics of the modified mixture using Marshall test, indirect tensile strength, and retaining strength. The findings showed that CMA-CKD has significantly improved in mechanical characteristics. Also, other types of fillers, such as SF, and RH Ash, as activators of CMA-CKD, showed substantial enhancement in their mechanical properties. CMA- CKD -SF showed performance superior to other modified mixtures. It concluded that the updated CMA could be an alternative to the CMA-OPC to gain the required mechanical properties besides other benefits such as cost-effectiveness and environmental impact.