Fillers Influence on Hot-Mix Asphalt Mixture Design and Performance Assessment

Abstract Filler’s presence in hot-mix asphalt (HMA) is even though minimal but they do affect its durability characteristics. Many natural and waste materials the form of fillers have been studied for their effectiveness on HMA mix design performance However, practice, stone dust (SD) preferred filler due to abundance, ease availability, cost-effectiveness. Thus, major objective this study was investigate effect locally available materials: (SD)- natural, hydrated lime (HL) – processed, rice-husk ash (RHA) fly-ash (FHA)-waste properties based factors such as field utilization, cost, sustainability, while at same time identify anomalies those selected if any. A viscosity grade (VG-30) binder checked fundamental consistency characteristics set forth Indian standards. In study, aggregate gradation structure specified bituminous concrete grading 1 (BC ) India designed preparation evaluation four mixes: (a) BC with SD -SD), (b) RHA -RHA), (c) FA -FA), d) HL -HL). Fillers: RHA, FA, were physico-chemical properties. The most recommended dosage 4% by weight kept uniform various mixes. Marshall method performed optimum content (OAC) different BC1 test results methylene blue value (MBV), german (GFV), fineness modulus (FM) indicated that includes more micron-to-nano sized particles than other two (HL FA). scanning electron microscope coupled energy dispersive X-ray showed exhibited similar chemical composition, identified be a calcium-based compound. -RHA resulted non-cohesive ranging from 4.5 6.5%. Additionally, contents range 7 9% compacted samples failed yield air voids required arrive OAC. - highest stability (26.97 KN) followed -HL (23.97 kN), -SD (17.9 kN). Also, retained all three mixes close proximity each indicative affinity asphalt. resistance moisture susceptibility better anti-stripping element SD. Among filler-based mixes, adjudged an effective resistant -FA, -SD. single not only tends improve parameters abundance cost-effective yet explored.