Mechanical Properties of Hot Mix Asphalt Incorporating Coal Fly Ash Filler

In coal-fired power plants, fly ash accounts for 60–88% of the total combustion residues. Coal fly ash (CFA) has been frequently used in concrete production; however, there are just a few occasions where CFA have been used in the construction of asphalt pavement. The research aims to evaluate CFA's performance as a filler in hot mix asphalt (HMA) mixtures. In this investigation, four CFA contents were used as filler by aggregate weight in the dry method. The resilient modulus (MR), dynamic creep, and wheel tracking tests were used to investigate the performance characteristics of mixtures. Increasing the CFA content in asphalt mixtures improved rutting and fatigue performance compared to a conventional mixture. Thus, it can be concluded that CFA can be used as an alternative filler in HMA.