Abstract
The recycling technique using materials produced by Cold Milling Machine is a potential alternative to be applied to road maintenance in Indonesia. This study aims to investigate the properties of Reclaimed Asphalt Pavement (RAP) used as Asphalt Concrete Wearing Course (AC-WC) so that the proportion of additional fresh aggregate can be determined. This laboratory-scale study uses the material of RAP from Semarang Section A toll road sections and penetrated asphalt of 60/70. The extraction analysis obtained asphalt content is between 3.50% - 4.36%, with abrasion of 29.04%. RAP cannot be used directly but there is a need to add fresh aggregate so that the mixture meets the specifications. The proportion of the mixture is 30% of RAP, 18% of the fresh aggregate, 50% of rock ash, and 2% of Cement. The analysis shows that the mixture with optimum asphalt content (5.7%) obtained 1188 kg of stability, 4.02% of VIM, 15.81% of VMA, 74.54% of VFWA, and 3.57 mm of flow. These values indicate that the mixture meets the revised version of the Technical Specifications of Bina Marga 2010. Therefore, it can be said that this mixture has high durability, good density, and is resistant to the possibility of bleeding.
Highlights
The existence of road as a vital part of infrastructure means it is the main pillar to support economic development at present (Magfirona, Hidayati, & Sunarjono, 2017)
One example of flexible pavement construction is asphalt concrete (AC) which is formed from a combination of various sizes of aggregates that are bound by asphalt cement to produce a mixture that has a higher stiffness (Gudipudi & Underwood, 2015)
Examination of Reclaimed Asphalt Pavement (RAP) obtained asphalt content extracted between 3.5% - 4.3%, wear 29.04%, Bulk specific gravity 2.607 gr/cc, SSD specific gravity 2.644%, apparent specific gravity 2.707 gr / cc and absorption 1.411%
Summary
The existence of road as a vital part of infrastructure means it is the main pillar to support economic development at present (Magfirona, Hidayati, & Sunarjono, 2017). The limitation of road materials (either aggregate or asphalt) in several regions in Indonesia is one obstacle to improving the performance of road infrastructure. This condition has an impact on the increasingly high costs of road construction and rehabilitation. Another alternative that can be done as an effort to overcome road damage is to extract the damaged layer using a cold milling machine as an overlay (Abraham & Ransinchung, 2019). Utilization of RAP is preferred over fresh aggregate given the increasing cost of asphalt, the lack of
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