Investigation on Ageing Susceptibility of Asphalt Mix Containing Industrial By-Products and Reclaimed Asphalt Pavement

The physical and chemical interactions between fillers and asphalt binders affect how quickly asphalt binders age due to oxidation in the asphalt mix. Specifically, the study investigates how the type and quantity of filler influence the ageing susceptibility of the asphalt mix containing reclaimed asphalt pavement. Control filler (stone dust), three industrial wastes (jarosite, hydrated lime mud, fly ash) and one agricultural waste filler, sugarcane ash were added in various proportions to the proposed recycled asphalt mixtures (2, 4, and 6%). The ageing susceptibility of asphalt mixes was investigated by comparing the performance of un-aged and long-term aged recycled asphalt mixes in terms of Marshall stability (MS), indirect tensile strength (ITS), tensile strength ratio (TSR), Marshall Quotient (MQ), Cantabro abrasion loss (CAL) and resilient modulus (RM) using ageing indices. The results were analysed statically using two-way ANOVA. The analysis concluded that the type of filler and its quantity in the recycled asphalt mix had a statistically significant effect on the ageing susceptibility of MS, ITS, TSR, and RM. However, the type and quantity of filler were found to be statistically non-significant in the case of the ageing susceptibility of the recycled asphalt mixes corresponding to their ravelling resistance (CAL). Furthermore, the study found that the apparent film thickness of recycled mixes played a significant role in their ageing susceptibility.