<![CDATA[The application of porous asphalt mixtures has increased because oftheir ability to improve surface drainage and traffic safety. However,their open-graded structure often reduces mechanical stability, makingfiller selection important for mixture performance. This study comparescorn cob ash and siwalan fruit shell ash as agricultural waste-based fillerson Marshall stability, flow, volumetric characteristics, Cantabro Loss,Asphalt Flow Down, and optimum asphalt content (OAC) of porousasphalt mixtures. Both waste materials were processed into fine ashpassing the No. 200 sieve and used at a fixed filler content of 1%.Laboratory testing included material characterization, mixture design,Marshall testing, Cantabro Loss, and Asphalt Flow Down. The OAC wasdetermined using the Australian Asphalt Pavement Association (AAPA,2004) procedure based on Voids in Mix, Cantabro Loss, and AsphaltFlow Down criteria. The results showed that both mixtures achieved thehighest Marshall stability at 4% asphalt content, with 1334 kg for thesiwalan fruit shell ash mixture and 1330 kg for the corn cob ash mixture.Flow values ranged from 2 mm to 3 mm, indicating acceptabledeformation behavior. The final OAC was 5.00% for the siwalan fruitshell ash mixture and 4.59% for the corn cob ash mixture. These findingsindicate that corn cob ash requires lower asphalt binder demand, whilesiwalan fruit shell ash remains feasible but requires higher bindercontent. The novelty of this study lies in the direct comparativeevaluation of two locally available agricultural waste ashes as sustainablefiller materials in porous asphalt mixtures.]]>
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