INFLUENCE OF FILLER TYPES ON STIFFNESS OF ASPHALT MIXTURES
Abstract
Filler is one of the components of asphalt.It plays a significant role on the characteristics
and performance of the asphalt concrete mixtures.In this study, two types of fillers(
limestone and granite dust) were utilized. To compare it's behavior, 16 numbers of Marshall
specimens were prepared according to American society for Testing and Materials ( ASTM
D-1559). The optimum bitumen content (O.B.C) based on 5.0%,5.5%,6.0%and 6.5%
bitumen content was determined. Afterward mechanical properties such as Marshall
stability, flow and stiffness were determined. The results show that 6.0% was the O.B.C for
the control and limestone filler. Limestone dust at 6.0% showed highest stability of
3.8KN/mm than that of the control, while the flow and stiffness were 1.83mm and
2.37KN/mm for limestone and granite dust. Mix with limestone dust performs better than
the mix with granite dust in terms of Marshall stability.This study concludes that limestone
dust can be used as a partial replacement for granite dust.
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