Prima Raja
Program Studi Teknik Sipil, Fakultas Teknologi Infrastruktur dan Kewilayahan, Institut Teknologi Sumatera, Lampung Selatan 35365, Indonesia
Galih Rio Prayogi
Program Studi Teknik Sipil, Fakultas Teknologi Infrastruktur dan Kewilayahan, Institut Teknologi Sumatera, Lampung Selatan 35365, Indonesia
Amelia Oktavia
Program Studi Teknik Sipil, Fakultas Teknik, Universitas Malahayati, Kota Bandar Lampung 35152, Indonesia
Keywords: Cantabro, coffee grounds ash, filler, marshall characteristics
ABSTRACT
Coffee grounds are organic waste generated from the processing of coffee beans, such as in coffee shops. This waste can be used as a substitute for filler material in asphalt mixtures due to its pozzolanic properties and silica content. This study uses coffee grounds ash as a partial replacement for Portland cement filler with variations of 0%, 25%, 50%, 75%, and 100%. The coffee grounds used were burned and sieved using a No. 200 sieve. The research was conducted using the Marshall method, with Portland cement filler and coffee grounds ash content of 6.0%, using five variations of filler content: 0%, 25%, 50%, 75%, and 100%. The results of the Marshall characteristics test with the 50% coffee grounds ash variation showed a stability value of 1515.87 kg at 5.5% asphalt content. The wear test of the specimen was conducted using the Cantabro Test method. The results of the Cantabro Test with 5.7% asphalt content yielded wear values of 1.12%, 1.44%, and 1%. Based on these test results, the silica content in coffee grounds affects the asphalt mixture and can improve the surface durability of the road against vehicle wheel friction.
