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This study aims to determine the effect of the addition of oil palm shell ash on the characteristics of asphalt and its mixtures. Palm shell is chosen as a filler material due to its content of silicon dioxide (SiO2) so that it is used as a suitable binder. This study consisted of several stages: (1) making modified bitumen; (2) testing modified bitumen with asphalt physical requirements method; (3) making and testing specimens; (4) Marshall testing. The results showed that the addition of oildoi:10.1088/1742-6596/1282/1/012031 fatcat:n4xdn6b32vgmvgikpr6z2bu72u