Abstract
Abstract The growing challenges of environmental sustainability and waste management in the construction industry have spurred the search for innovative materials to enhance asphalt mixtures. Conventional porous asphalt faces limitations in durability and performance under varying traffic and weather conditions. Moreover, the disposal of oyster shells and High-Density Polyethylene (HDPE) waste poses significant environmental concerns. This study evaluates the effect of oyster shell ash (OSA) as a filler and HDPE waste as an asphalt substitute in porous asphalt mixtures. Testing was conducted to determine the Optimum Asphalt Content (OAC) based on three primary parameters: Cantabro Loss (CL), Void In Mix (VIM), and Asphalt Flow Down (AFD). The results indicate that the OAC value is 5.8%. In the Void In Mix (VIM) test, the best results were obtained with a variation of 50% OSA: 50% PC and 4% and 6% HDPE, yielding VIM values of 18.49% and 18.16%, respectively, which meet the AAPA (2004) standard requirement of 18-25%. The Asphalt Flow Down (AFD) test results showed that the same mixture produced AFD values of 0.09% and 0.10%, well within the maximum limit of 0.3%. The optimal values for the Cantabro Loss (CL) parameter were also achieved with the same combination, resulting in 32.67% and 30.07%, which comply with the maximum threshold of 35%. This study concludes that the combination of oyster shell ash (50% OSA: 50% PC) and HDPE (4% and 6%) performs well in porous asphalt mixtures, meeting the standards for durability, strength, and stability in road pavement applications.
Published Version
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