ABSTRACT
Mineral filler in asphalt concrete is the inert material passing the No.200 sieve and occupies the void space between coarse aggregates particles and pores within the aggregates particles. The main objective of this research is to experimentally investigate the effect of using diverse types of fillers, and their content on hot asphalt concrete mixtures. Two types of materials; fly ash and lime, are used as mineral fillers in hot asphalt concrete mixtures individually and in combination. Four types of samples were prepared with replacements of filler content with fly ash and lime as mix including control mix, 100% replacement with fly ash, 100% replacement with lime and 100% with equal proportions of fly ash and lime. The results of Marshall tests on mix design of hot asphalt concrete mixtures, for the wearing course concluded that, using fly ash as 100% replacement of filler, with its optimum asphalt content of 5.414% (by the weight of total aggregates), resulted in producing asphalt concrete mixtures with slightly lower Marshall Stability as compared to control mix but improvement in other properties like lower flow, highest density and lower voids in total mix.
