Studi Karakteristik Marshall pada Aspal Porous dengan Penambahan Abu Cangkang Kopi sebagai Filler

Abstract

The type of pavement used in Indonesia is generally flexible pavement. Porous asphalt is one of the flexible pavement layers. Porous asphalt is a mixture of asphalt concrete with a high content of air voids in the mixture. The purpose of the study was to determine the composition and characteristics of porous asphalt with coffee shell substitution as a filler. Aggregate gradation used open gradation or uniform graded with variations in asphalt content of 3.2%, 3.7%, 4.2%, 4.7% and 5.2% before being substituted for coffee shells, using 60/70 penetration asphalt as a binder. The results of testing and calculation of Marshall parameters to determine KAO, obtained an optimum asphalt content of 4.7% with a stability value of 804 kg, flow 3.3 mm, VIM 19.2%, and MQ 249.4 kg/m. After the KAO was obtained, the specimens were made with variations of coffee shell substitution of 0.5%, 1%, 1.5%, 2% and 2.5%. Marshall test results obtained the optimum composition of coffee shell content at 1% composition with a stability value of 1474 kg, flow 3.1 mm, VIM 13.8%, and MQ 475.6 kg/m. The optimum coffee shell content is determined by the results of the ups and downs of a graph. The test results are evidenced by the increase in the value of the graph on the value of stability, flow, and MQ.