Abstract
Abstract This study aims to determine the optimal percentage of Styrofoam and Coconut Shell Ash (CSA) in the Asphalt Concrete-Wearing Course (AC-WC) mixture to mitigate the impact of diesel fuel spills on asphalt quality, addressing the degradation of asphalt due to accidental diesel fuel spills that compromise road durability. The research employed Marshall parameter testing following Bina Marga 2018 General Specifications, Revision 1 of 2019 (Division 6). Five asphalt content variations were used (4.5%, 5%, 5.5%, 6%, and 6.5%), with two substitution levels for Styrofoam (6% and 8%) and two for CSA (50% and 100%). The impact of diesel fuel immersion was simulated with immersion times of 5 and 9 minutes. The optimal asphalt content (OAC) was found to be 5.5%, producing favorable characteristics with a stability value of 3,868.26 kg, while the combination of 8% Styrofoam and 50% CSA filler yielded the best performance with a stability value of 4,817.28 kg. Immersion testing of this mixture with diesel fuel for 5 minutes (4,212.64 kg) and 9 minutes (3,874.08 kg) also produced stability values well above the required threshold of > 1,000 kg. The results demonstrate that using 8% Styrofoam and 50% CSA filler can significantly improve the mixture’s resistance to degradation from diesel spills. This study provides significant insights into the potential of using polymer waste materials to enhance the durability of asphalt roads, promoting the reuse of waste and improving road infrastructure resilience.
Published Version
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