<![CDATA[This study investigates the effect of using Parangtritis beach sand as fine aggregate and rice husk biochar as an additive on the stability and durability of Asphalt Concrete Wearing Course (AC-WC) mixtures. Parangtritis beach sand has abundant availability; however, its fine, rounded grains with high silica content result in low adhesion to asphalt. To improve performance, rice husk biochar was utilized as an additive. The research determined the Optimum Asphalt Content (OAC) using the Narrow Range method with asphalt variations of 4%, 5%, 6%, 7%, and 8%, and beach sand variations of 15%, 30%, and 45% by the weight of fine aggregate to obtain the Optimum Beach Sand Content (OBSC). The Marshall Stability Test was conducted with immersion periods of 0, 24, 72, 168, and 336 hours to evaluate stability and durability parameters, including the First Durability Index (FDI), Second Durability Index (SDI), and Retained Strength Index (RSI). The results showed that the mixture containing Parangtritis beach sand and rice husk biochar met the 2018 Bina Marga specifications, with an OAC of 6% and an OBSC of 24.25%. The addition of 4% biochar produced the best performance, achieving a stability of 1,492.59 kg and RSI values of 91.2% (24 hours) and 64.3% (336 hours), indicating a significant improvement in the mixture’s stability and durability.]]>
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