Recycled fillers as an alternative in bituminous mixtures for road pavements

This paper reports the results of a laboratory investigation on the use of recycled industrial fillers into bituminous mixtures for road pavements. The investigated fillers were obtained by crushing and sieving (0.00–0.63 mm) Stabilized Bottom Ashes (SBAs) from municipal waste incinerators and Electric Arc Furnace Steel Slags (EAFSSs). Moreover, a currently used calcareous filler was included in the research for comparative purposes. Two dosages of each filler were considered in the experimentation. Laboratory tests aimed at investigating compaction properties, volumetric characteristics, and mechanical performance of the bituminous mixtures. The results suggest that both the investigated recycled fillers are suitable to be used into bituminous mixtures, also demonstrating that in certain conditions those fillers increase the performance of the corresponding mixtures in comparison to the ones in which standard (calcareous) filler is used.