The Effect of Seawater Soaking Duration on the Performance of Continuously Graded Asphalt Mixtures with Coarse Aggregate Substitution Using Steel Slag Waste Anita Rahmawati, Anita Widianti, Bagus Soebandono, Wahyu Widodo, Pranawa Wiryawan , Hafiz Hidayat and Rama Rizana
Roads along the coast are particularly susceptible to flooding from seawater. The degradation of road pavements, particularly flexible pavements, can be accelerated by this type of flooding. The high salt content of seawater is one of the primary causes, as it can hasten the oxidation of asphalt materials. This study investigates the effects of varying seawater exposure times, specifically 24 and 48 hours, on asphalt mixture performance. In these mixtures, 3/8-inch coarse aggregate in continuously graded asphalt is substituted with steel slag waste. Asphalt samples containing 0%, 25%, 50%, 75%, and 100% steel slag were made in order to assess the effect. The samples were mixed and then soaked in seawater for the specified amounts of time. The Marshall test method was used to evaluate their structural qualities after the soaking was finished. The findings revealed a broad pattern: the longer the samples were exposed to seawater, the lower the majority of important Marshall parameters, including stability, VMA, VIM, VFA, and Marshall Quotient (MQ). It^s interesting to note that Flow was the only parameter that rose over time, suggesting that the asphalt had a greater propensity to deform under load.
