ANALYSIS OF SKID RESISTANCE PERFORMANCE OF STONE MASTIC ASPHALT (SMA) MIXTURES USING STEEL SLAG AGGREGATE

• Main Author: Laia Ola Manik , Ade
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/80988
• Institution: Institut Teknologi Bandung

Pavement must provide comfort and safety for its users. Improving skid resistance can minimize traffic accidents caused by slips. Skid resistance provides sufficient friction for vehicle tyres and road surfaces, especially in rainy conditions. The use of Steel Slag Aggregate (SSA) as a replacement for coarse natural aggregates is expected to increase the initial skid resistance value of Stone Mastic Asphalt (SMA) mixes due to its rougher surface and more cubical shape. This research aims to analyze the effect of SSA usage levels on skid resistance performance. Tests will be conducted at 0%, 30%, 50%, 75%, and 100% SSA usage levels. Tests were conducted at the Optimum Asphalt Content (KAO) for each level of SSA usage. The skid resistance indicators analysed were PSV on coarse aggregate, British Pendulum Tester (BPT) to evaluate pavement microtexture performance, and Sand Patch to evaluate pavement macrotexture performance. The KAO for 0%, 30%, 50%, 75%, and 100% SSA variations, as determined by the volumetric and Marshall stability tests, are 7.06%, 6.94%, 6.9%, 6.64%, and 5.96%, respectively. The use of SSA as a substitute for conventional coarse aggregate can increase the Marshall stability value of SMA mixes. However, at 75% and 100% SSA content, the resulting mixture did not meet the VMA parameter requirements. Therefore, it is not recommended to use 75% and 100% SSA content in SMA mixtures. The PSV test indicates that using SSA can increase the PSV value of coarse aggregate. Similarly, the BPT test results demonstrate that using SSA can enhance the initial skid resistance value of SMA mixes. Additionally, the sand patch test results reveal that using 50% SSA yields the greatest texture depth value. Therefore, replacing conventional coarse aggregate with SSA in SMA mixes can offer a solution to the use of conventional aggregates while improving the skid resistance performance of SMA mixes.