RAHMATTULLOH, NUR (2025) PEMANFAATAN LIMBAH STEEL SLAG EX. POSCO KRAKATAU SEBAGAI SUBSTITUSI AGREGAT KASAR TERHADAP NILAI DAYA DUKUNG LAPIS PONDASI PADA PERKERASAN JALAN TOL. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
This study aims to examine the potential of Steel Slag waste as a substitute material for conventional aggregate in the foundation layer of toll road pavements. The research variables include physical and mechanical characteristics as well as the gradation distribution of the aggregate mixture. The study employs an experimental method, with six variations of coarse aggregate mixtures: Steel Slag coarse aggregates (100:0, 80:20, 60:40, 40:60, 20:80, and 0:100). Data were analyzed through gradation tests, density tests, and California Bearing Ratio (CBR) tests conducted in the laboratory at Serang–Panimbang Toll Section 2. Steel Slag needs to be utilized as it is a by-product of the steel industry, which continues to increase in volume, thereby reducing the exploitation of natural resources and supporting environmental management. Additionally, this material possesses superior mechanical properties, such as high load-bearing capacity, which can enhance the quality of road structures. The research results indicate that all material characteristic tests meet the technical specifications outlined in the Surat Edaran Dirjen Bina Marga Nomor 16.1/SE/Db/2020. The use of Steel Slag up to 40% in the aggregate mixture significantly improves density and CBR values, making it suitable for use in the upper base layer. The gradation distribution of all mixture variations falls within the specified limits. This study demonstrates that Steel Slag provides high load-bearing capacity and enhances the durability of foundation layers. Specifically, the 40% Steel Slag mixture achieved a CBR value of 104%. According to the “Surat Edaran Dirjen Bina Marga Nomor 16.1/SE/Db/2020”, the minimum CBR value for the upper base layer is 90%. Therefore, this research shows that the use of Steel Slag as an aggregate mixture effectively improves the quality of pavement foundation layers, reduces dependency on conventional raw materials, and supports sustainability through industrial waste management and environmental stewardshipt. Key Words: Steel Slag, foundation layer, road pavement, aggregate gradation, CBR Penelitian ini bertujuan untuk mengkaji potensi limbah Steel Slag sebagai bahan substitusi agregat konvensional pada lapisan pondasi perkerasan jalan tol. Variabel penelitian meliputi karakteristik fisik, mekanis, serta distribusi gradasi campuran agregat. Metode penelitian ini menggunakan metode eksperimental. Terdapat enam variasi campuran agregat kasar : Steel Slag kasar (100:0, 80:20, 60:40, 40:60, 20:80, dan 0:100). Data dianalisis melalui pengujian gradasi, kepadatan, dan nilai California Bearing Ratio (CBR) di Laboratorium Tol Serang–Panimbang Seksi 2. Steel Slag perlu dimanfaatkan karena limbah industri baja yang jumlahnya terus meningkat, sehingga dapat mengurangi eksploitasi sumber daya alam dan mendukung pengelolaan lingkungan. Selain itu, material ini memiliki karakteristik mekanis unggul, seperti daya dukung tinggi, yang dapat meningkatkan kualitas struktur jalan. Hasil penelitian menunjukkan bahwa seluruh pengujian karakteristik material memenuhi spesifikasi teknis sesuai Surat Edaran Dirjen Bina Marga Nomor 16.1/SE/Db/2020. Penggunaan Steel Slag hingga 40% dalam campuran agregat mampu meningkatkan kepadatan dan nilai CBR secara signifikan, sehingga cocok digunakan pada lapis pondasi atas (LPA). Distribusi gradasi semua variasi campuran berada dalam batas spesifikasi yang ditetapkan. Penelitian ini membuktikan bahwa Steel Slag memberikan daya dukung tinggi, dan meningkatkan durabilitas lapisan pondasi. Dimana dari penelitian ini pada campuran material steel slag 40% didapatkan nilai CBR sebesar 104%. Berdasarkan Surat Edaran Dirjen Bina Marga Nomor 16.1/SE/Db/2020 dimana lapis pondasi atas nilai CBR minimum 90%. Sehingga dari penelitian ini menunjukkan bahwa penggunaan Steel Slag sebagai campuran agregat efektif dalam meningkatkan kualitas lapisan pondasi perkerasan jalan, mengurangi ketergantungan pada bahan baku konvensional, mendukung keberlanjutan melalui pengelolaan limbah industri dan pengelolaan lingkungan. Kata Kunci: Steel Slag, lapisan pondasi, perkerasan jalan, gradasi agregat, CBR
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