The Performance of Warm Mix for the Asphalt Concrete - Wearing Course (AC-WC) Using the Asphalt Pen 60/70 and the Sasobit® Additives

• Main Authors: Serli Carlina, Bambang Sugeng Subagio, Aine Kusumawati
• Format: Article
• Language: English
• Published: Institut Teknologi Bandung 2019-04-01
• Series: Jurnal Teknik Sipil
• Subjects: hma; wma; sasobit®; temperature
• Online Access: http://journals.itb.ac.id/index.php/jts/article/view/11186/4179
• ISSN: 0853-2982; 2549-2659

Hot Mix Asphalt (HMA) is a type of asphalt mixture commonly used as flexible pavement material. However, HMA has weaknesses in terms of high mixing and compaction temperature, resulting in high CO2 and Greenhouse Gas (GHG) emissions which have a negative impact on the environment. Therefore, a type of asphalt with lower mixing and compaction temperatures is needed. One alternative that can be done is to add Sasobit® additives to the asphalt. This study looks for the best contents of Sasobit® additives that can be added into the asphalt so that resulting the lowest mixing and compaction temperatures. The content of Sasobit® additives studied was 1%, 2% and 3% of the asphalt weight, sasobit contents higher than 3% are not recommended because it will cause the asphalt to be more liquid. The results show that the addition of Sasobit® by 3% may reduce the mixing temperature and the compaction temperature at about 70C lower compared to the mixture without Sasobit® additives. Further, this study compares the performance of asphalt mixtures using Sasobit® additives (mixture of Warm Mix Asphalt / WMA) with asphalt mixtures without Sasobit® additives (Asphalt / HMA Hot Mix mixture). The performance studied includes Marshall Stability, UMATTA Resilient Modulus and Fatigue. As a result, the WMA mixture that uses Sasobit® additives of 3% has a stability value of 1160 kg marshall; this value is higher than the Marshall stability obtained for the HMA mixture 1075 kg. However, the UMATTA testing at temperatures of 250C and 450C resulted in the highest resilient modulus in the mixture of WMA (3080 Mpa and 315 Mpa). The fatigue testing shows that WMA mixture is more flexible because it has an elastic modulus value of 4854 MPa and flexural stiffness 4551 MPa in a tensile 500µԐ strain compared to HMA mixture.