Optimalisasi Campuran AC-BC Menggunakan Asbuton B50/30 Berdasarkan Karakteristik Marshall

Ibnu Alfarizi

Authors

Ibnu Alfarizi Universitas Muhammadiyah Parepare Author

Keywords:

Campuran Panas, Asbuton B50/30, Karakteristik Marshall

Abstract

The increasing use of hot mix asphalt in road construction has prompted Indonesia to explore local alternatives to petroleum asphalt, particularly Buton natural asphalt (Asbuton). This experimental study evaluates the Marshall characteristics of asphalt concrete base course (AC-BC) mixtures modified with B50/30 type asbuton to determine the optimal content for improving mechanical performance within national specifications. The laboratory research used a dry mixing method with 24 test specimens in two stages: determining the optimum asphalt content (OAC) using asphalt variations of 4.5%-6.5% (15 test specimens), followed by Asbuton modification at 8%, 9%, and 10% of the asphalt percentage (9 test specimens). Testing parameters include stability, flow, density, VIM, VMA, VFB, and Marshall Quotient, following SNI 06-2489-1991 procedures. The research results indicate that an asbuton content of 8% with an optimum asphalt content of 5.70% achieves the best performance with a stability of 1916 kg and a Marshall Quotient of 626.85 kg/mm, meeting the specifications of Bina Marga 2018 Revision 2. Improved performance is achieved through bitumen enrichment and the mineral filler effect of 76.68% mineral content in asbuton. Adding higher amounts of asbuton leads to an overbitumen effect and reduced stability. Therefore, an 8% asphalt content is recommended as the optimal content for improving the performance of AC-BC mixtures.

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