The increase of the population growth in Indonesia causes an increase of the traffic volume on the road. With the increase of the traffic volume, it is necessary to improve the quality of the road construction, especially from the pavement layer quality. On the road that have moderate traffic volume to high traffic volume, several problems in the pavement layer are often found. One way to decrease the road damage is by improving the quality of the asphalt mixture, which means increasing the asphalt quality. The research design is conducted by testing the characteristic of Asphalt Pen 60/70 and also the Asphalt Pen 60/70 mixed with gilsonite additive at 4.5%; 5.5%; 6.5%; 7.5%; and 8.5% of the asphalt weight. The Asphalt Pen 60/70 mixed with the gilsonite additive is called as the modified asphalt. Based on the testing results, it is obtained that the characteristic of modified asphalt has a better asphalt characteristic than the Asphalt Pen 60/70. The percentage of gilsonite level that still meets all the modified asphalt requirements is at the percentage of 6.5% with ductility value >140 cm, 336°C flash point, 54.5°C softening point, 1.037 gravity specific, and 41 penetrations. Besides, the 7.5% and 8.5% gilsonite levels have better asphalt characteristic than the Asphalt Pen 60/70.

A Porous asphalt mixture uses an open gradation with a percentage of the coarse aggregate greater than the fine aggregate, so that it has a larger air void. This mixture has a main obstacle, i.e. the low stability value which is caused by a number of cavities in the asphalt porous mixture. So as to increase the stability value of the asphalt porous mixture, one of the methods used is by adding a substance, i.e. gilsonite which aims to improve the quality of oil asphalt and the quality of the mixture. The use of concrete waste as the coarse aggregate can also increase the mixture stability. The method used in this study is an experimental method with a laboratory scale. The aggregate used in this study is the Australian gradation. The proportion of the coarse aggregate between concrete waste and crushed stone is 0 and 100, 25 and 75, 50 and 50, 75 and 25, 100 and 0. Meanwhile, the added material used is gilsonite, with gilsonite variation of 4.5%; 5.5%; 6.5%; 7.5% and 8.5%. The use of optimum asphalt content of 5.13, the optimum waste content of 100% concrete waste and the optimum gilsonite content of 8.5% resulting in a better characteristic and performance value of the porous asphalt mixture than the normal porous asphalt mixtures by marshall test, dynamic stability, slip resistance and resilient modulus.