PERFORMANCE ANALYSIS OF FINE TYPE STONE MASTIC ASPHALT USING STEEL SLAG AGGREGATE AS A SUBSTITUTE FOR COARSE AGGREGATE

• Main Author: Jomanta
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/80477
• Institution: Institut Teknologi Bandung

The use of Steel Slag Aggregate (SSA) as a substitute for aggregate in highway construction is one of the efforts to minimize the environmental damage caused by excessive aggregate mining. In this study, SSA is used as a substitute for aggregate in the fine type of Stone Mastic Asphalt (SMA) asphalt mixtures. The proportions of SSA used as a substitute for aggregates are 30%, 40% and 50%. The properties and performance of SSA in the asphalt mixture are then analyzed using parameters such as Marshall Stability, Stripping Resistance, Resilient Modulus, and Fatigue Resistance. The aim of this study is to determine the optimal use of SSA in asphalt mixtures. SSA has the same properties as conventional aggregates, but it has a more cubic shape, a higher density and lower water absorption compared to conventional aggregates. For all variants of the asphalt mixtures (SSA 0%, SSA 30%, SSA 40% and SSA 50%), the optimum asphalt content is 7%. The values for density, VFB (voids filled with bitumen), VMA (voids in mineral aggregates) and the Ratio of VCAmix/VCAdrc increase with the addition of SSA to the asphalt mixtures, while VIM (voids in mineral aggregates) decreases as the proportion of SSA increases. The results of the Marshall Stability tests show that the asphalt mixture with 30% SSA has an optimum Marshall Stability value of 1;016.14 kg. The result of Stripping Resistance test shows that the asphalt mixture with 30% SSA achieves an optimum TSR value (Tensile Strength Ratio) of 84.60%. The Resilient Modulus test shows that the asphalt mixture with 40% SSA has optimum values of 1,333 MPa at 25 °C and 461.5 MPa at 35 °C. The Fatigue Resistance test shows that the asphalt mixture with 30% SSA has optimum values of 4,348 cycles at a stress load of 200 kPa and 1,732 cycles at a stress load of 250 kPa. The optimum use of Steel Slag Aggregate (SSA) as a substitute for aggregates in fine-type stone mastic asphalt (SMA) is 30% when considering the parameters Marshall Stability, Stripping Resistance and Fatigue Resistance. When evaluated on the basis of the Resilient Modulus parameter, it is 40%.