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Abstrak :
This study investigated the possibility of developing a synthetic fill material by combining industrial waste materials, thus, integrating the properties of cohesion and friction as a replacement for natural soil. Biosolids and steel slag were selected for proportioning of the synthetic fill material. They were blended in different proportions and the geotechnical properties of the various blends were investigated to determine the strength and bearing of the blended synthetic material for fill applications. The results of the investigation were encouraging with the index properties of the blends better than those of biosolids. It was found that 25% to 40% steel slag blending produced the maximum strength and bearing. The investigation revealed that blending of industrial waste materials has the potential to perform the function of a synthetic fill material in road embankments and backfills. However, further studies are recommended to investigate its long term compressibility and permeability and further improvement of bearing to meet local standards.

Abstrak :
Terjadinya kegagalan dalam sejumlah konstruksi timbunan antara lain disebabkan oleh permasalahan tanah dasar dan struktur timbunan itu sendiri. Tanah dasar berupa tanah lunak yang berarti daya dukung kecil menyebabkan terjadinya settlement vertikal pada timbunan terlalu besar. Kemudian, pemilihan material timbunan yang kurang tepat, dalam hal ini spesifikasi berat jenis yang terlalu besar menyebabkan tegangan vertikal yang terjadi terlalu besar sehingga memperbesar risiko terjadinya settlement atau bentuk-betuk kegagalan lain pada timbunan. Fokus pembahasan ditujukan pada pemilihan material ringan timbunan.

Sebagai upaya memperkecil terjadinya settlement atau bentuk-betuk kegagalan lain pada timbunan. Material ringan tersebut dimodifikasi dari bahan dasar serabut dan tempurung kelapa. Hasil modifikasi tersebut kemudian dilakukan pengujian di laboratorium mengenai kekuatan, kerapatan jenis, modulus elastisitas dan data-data lainnya sehingga material tersebut layak untuk digunakan sebagai material timbunan.

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The failure at some of fill construstions occur caused by subgrade troubles and structural embankment unsatisfactory. Subgrade in the form of soft soil that means has low support value able to make vertical settlement of embankment structural is too large. In addition, unappropriate in choosing embankment materials for application, especially too heavy specification density cause vertical tention become too large. It brings effect enlarge of settlement or others pattern failure risk in the structural fill.

Primary explain purposed to select leightweight fill material for reducing settlement or others pattern failure occur in the structural fill. It?s leightweight material modified from coconut?s fiber and shell. The modified material above is going to be continued for laboratory testing to determine value of strength, density, elasticity of modulus, and other datas needed. So, we can take the conclusion that lightweight material above is feasible to be applied as a fill material.