THE EFFECT OF THE CHARACTERISTICS OF USING RECYCLED CONCRETE AGGREGATES (RCA) AS A COARSE AGGREGATE SUBSTITUTION IN ASPHALT CONCRETE BASE COURSE (AC-BASE) LAYERS ON MARSHALL PARAMETERS

Peningkatan penggunaan material konstruksi yang berkelanjutan dan ramah lingkungan menjadi perhatian utama dalam pengembangan infrastruktur jalan saat ini. Salah satu inovasi yang sedang dipelajari dengan penggunaan Recycled Concrete Aggregates (RCA) sebagai pengganti agregat kasar pada lapisan Asphalt Concrete Base Course (AC-BASE). Penelitian ini bertujuan untuk mengevaluasi pengaruh penggunaan RCA terhadap karakteristik Marshall campuran AC-BASE. Metode yang digunakan adalah pengujian laboratorium dengan variasi persentase RCA sebanyak 15%, 30%, dan 45%. Hasil penelitian menunjukkan bahwa RCA memiliki berat jenis curah 2,055 gr/cm³, berat jenis kering permukaan 2,150 gr/cm³, dan berat jenis semu 2,270 gr/cm³, dengan penyerapan air sebesar 4,60%. Pada hal ini Campuran AC-BASE dengan RCA 30% memenuhi spesifikasi Bina Marga untuk stabilitas minimal 1800 kg, dengan nilai stabilitas 1857,2 kg. Nilai flow 4,5 mm, VIM 4,4%, VMA 13,6%, VFA 67,8%, Marshall Quotient 412,3 kg/mm, dan durabilitas 97% menunjukkan kinerja yang baik dan stabil. Berdasarkan hasil tersebut, penggunaan RCA 30% disarankan sebagai komposisi optimal dalam campuran AC-BASE memberikan karakteristik perkerasan yang stabil dan ramah lingkungan.

The increased used of sustainable and environmentally friendly construction materials is a major concern in the development of road infrastructure today. One of the innovations being studied is the use of Recycled Concrete Aggregates (RCA) as a coarse aggregate replacement in Asphalt Concrete Base Course (AC-BASE) layers. This research aims to evaluate the effect of using RCA on the Marshall characteristics of AC-BASE mixtures. The method used is laboratory testing with variations in the percentage of RCA as much as 15%, 30%, and 45%. The results showed that RCA had a bulk specific gravity of 2.055 gr/cm³, surface specific gravity of 2.150 gr/cm³, and apparent specific gravity of 2.270 gr/cm³, with water absorption of 4.60%. In this case the AC-BASE Mix with 30% RCA meets the Bina Marga specification for a minimum stability of 1800 kg, with a stability value of 1857,2 kg. the Flow value of 4.5 mm, VIM value of 4.4%, VMA 13.6%, VFA 67.8%, Marshall Quotient 412.3 kg/mm, and durability 97% show good and stable performance. Based on these results, the use of 30% RCA is recommended as the optimum composition in AC-BASE mixtures to provide stable and environmentally friendly pavement characteristics.