Electronic Theses and Dissertation

Kinerja campuran aspal yang andal terhadap beban berat dan suhu tinggi membutuhkan material penyusun berkualitas, termasuk filler. Aspal PG-70 menawarkan performa unggul, namun efektivitasnya juga dipengaruhi oleh komposisi campuran. Seiring terbatasnya abu batu sebagai filler konvensional, diperlukan bahan alternatif ramah lingkungan. Fly ash (limbah industri) dan cangkang kerang (limbah organik) dinilai potensial untuk digunakan sebagai substitusi filler pada campuran AC-WC. Penelitian ini bertujuan menentukan kadar optimum substitusi keduanya terhadap abu batu serta mengevaluasi durabilitas campuran melalui uji Marshall. Variasi substitusi sebesar 0%, 25%, 50%, 75%, dan 100% digunakan dengan kadar filler total 7%. Kadar aspal optimum ditentukan melalui pendekatan overlapping, dan durabilitas diuji melalui rendaman Marshall pada suhu 60°C selama 30 menit dan 24 jam.Hasil menunjukkan bahwa substitusi 50% fly ash dan cangkang kerang memberikan kinerja terbaik. Campuran cangkang kerang 50% menghasilkan stabilitas 2060,22 kg dan fly ash 50% mencapai 2178,66 kg. Pada pengujian durabilitas, campuran CK 50% memiliki stabilitas 2106,63 kg (30 menit) dan 1966,34 kg (24 jam) dengan sisa stabilitas 93,34%, sedangkan FA
50% menghasilkan 2317,05 kg dan 2135,06 kg dengan sisa 92,15%. Seluruh hasil melebihi batas minimal 90% sesuai Spesifikasi Bina Marga 2020, menunjukkan bahwa kedua limbah tersebut layak sebagai filler alternatif dalam campuran AC- WC berbasis aspal PG-70.

Kata Kunci: filler, aspal PG-70, ac-wc, fly ash,cangkang kerang.

The performance of asphalt mixtures under heavy loads and extreme temperatures requires high-quality constituent materials, including fillers. PG-70 modified asphalt offers superior durability, but its effectiveness also depends on the supporting components. As conventional filler sources such as stone dust become limited, environmentally friendly alternatives are needed. Fly ash (industrial waste) and seashells (organic waste) have potential as filler substitutes in asphalt concrete–wearing course (AC-WC) mixtures. This study aims to determine the optimum substitution level of both materials for stone dust and to evaluate the durability of the mixtures using the Marshall test. Substitution variations of 0%, 25%, 50%, 75%, and 100% were used, with a total filler content of 7%. The optimum asphalt content was determined using the overlapping method, and durability was tested by Marshall immersion at 60°C for 30 minutes and 24 hours. The results showed that 50% substitution of fly ash and seashell filler yielded the best performance. The 50% seashell mixture produced a stability value of 2060.22 kg, while fly ash at the same percentage achieved the highest stability at 2178.66 kg. In the immersion test, the 50% seashell mixture reached 2106.63 kg (30 minutes) and 1966.34 kg (24 hours) with 93.34% retained stability, while the 50% fly ash mixture reached 2317.05 kg and 2135.06 kg with 92.15% retained stability. All values exceeded the minimum requirement of 90% as specified by the 2020 Bina Marga standards, indicating that both waste materials are feasible and effective as alternative fillers in PG-70-based AC-WC mixtures. Key Words: filler, pg-70 asphalt, ac-wc, fly ash, seashells