KOMBINASI FILLER LIMESTONE DAN ABU BATU PADA CAMPURAN LASTON LAPIS AUS MENGGUNAKAN METODE MARSHALL
Combination of Limestone and Stone Ash Filler on Asphalt Concrete Wearing Course using the Marshall Method
DOI:
https://doi.org/10.29303/spektrum.v9i1.240Keywords:
Filler, Laston, Limestone, Metode marshallAbstract
Filler digunakan untuk meningkatkan stabilitas dan kerapatan dari campuran aspal. Limestone dengan unsur utamanya kalsium dalam bentuk halus dapat meningkatkan viskositas campuran yang membuat daya lekat antar agregat menjadi tinggi. Penelitian ini menggunakan kombinasi filler antara limestone dan abu batu sebesar 0%, 25%, 50%, 75% dan 100% serta kadar aspal optimum sebesar 6,75% pada campuran laston wearing course. Pengujian dan analisis menggunakan metode marshall berupa pemeriksaan volumetric dan mekanis. Pengaruh penambahan filler limestone lebih dari 50% pada abu batu menunjukkan penurunan nilai VIM dan VMA, sedangkan VFB semakin meningkat. Nilai stabilitas dan marshall quotient dengan penambahan limestone cenderung menurun, hal ini disebabkan karena interlocking antar agregat semakin berkurang dan banyak aspal yang bisa mengisi rongga campuran. Nilai marshall quotient mengalami penurunan berarti tingkat plastisitasnya tinggi maka campuran tidak akan mudah mengalami retak. Sebaliknya, semakin banyak aspal yang mengisi rongga nilai flow cenderung meningkat. Penggunaan filler limestone lebih dari 50% pada campuran laston wearing course tidak memenuhi persyaratan karena mempunyai nilai flow di luar interval 2-4%.
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