Design Method of Porous Asphalt Mixed for Heavy Overloaded Road Conditions in Indonesia

The porous asphalt mixture system is generally an open gradation type of aggregate, with certain requirements, including air voids in dry rodded compacted coarse aggregate (VCA_DRC) which is larger than the air voids in the coarse aggregate in the compacted asphalt mixture (VCA_MIX). Based on this concept, porous asphalt mixtures must be designed with a combination of coarse aggregate fractions that are able to provide high strength values but still have adequate seepage of that mixture. The structuring concept in question is to arrange the proportion of the aggregate fraction that produces the smallest VCA_DRCvalue. The results of this research indicate that the value has met the requirements of the VCA_DRCis 37,562%; while the value of VCA_MIXis 36,710%; and adjust the portion of the fine aggregate fraction is around 20%-25% so that, the Marshall stability value is 3250 kg - 4550 kg, with seepage values of 0.0457 - 0.0731 mm/second. With this seepage value, the rainwater disappears after the rain stops, so there is no puddle even though there are valleys on the surface of the pavement. Meanwhile, Marshall's very high stability value means that the porous asphalt can support a repeated heavy overloaded that usually occurs in Indonesia.