Studi Perbaikan Tanah Dispersif Menggunakan Fly Ash Pada Bahan Timbunan Inti Tubuh Bendungan

Rani, Rillist Rimba (2023) Studi Perbaikan Tanah Dispersif Menggunakan Fly Ash Pada Bahan Timbunan Inti Tubuh Bendungan. Diploma thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Bendungan merupakan salah satu bangunan yang menggunakan tanah sebagai bahan konstruksi. Pada bendungan urugan tipe zonal, terdapat lapisan kedap air yang berfungsi sebagai penahan rembesan. Umumnya, jenis tanah yang digunakan pada lapisan tersebut adalah tanah lempung. Namun, beberapa tanah lempung yang digunakan dalam lapisan tersebut memiliki sifat dispersif, rentan terhadap erosi, dan mengandung ion natrium dalam jumlah tinggi. Kandungan natrium yang tinggi menyebabkan partikel-partikel tanah saling tolak-menolak, menyebabkan keruntuhan tanah. Tujuan penelitian ini yakni mengetahui pengaruh penambahan fly ash terhadap tingkat dispersivitas tanah. Metode penelitian yang digunakan berupa observasi yaitu pengujian tingkat dispersivitas, sifat fisik, dan mekanis di laboratorium. Pengujian dilakukan pada tanah asli dan tanah yang distabilisasi menggunakan fly ash dengan kadar 3%, 5%, 8%, 10%, dan 12%. Hasil penelitian menunjukkan bahwa kandungan fly ashsebesar 3% dengan waktu pemeraman selama 7 hari memberikan hasil terbaik dalam berat jenis kering maksimum, kuat tekan bebas, dan koefisien permeabilitas terendah. Uji double hydrometer dan uji crumb juga mengonfirmasi bahwa penambahan fly ash sebanyak 3% dalam waktu pemeraman 7 hari efektif dalam mereduksi sifat dispersivitas tanah. Dalam kesimpulannya, penelitian ini menunjukkan bahwa penggunaan fly ash sebanyak 3% dengan waktu pemeraman selama 7 hari dapat mengurangi dispersivitas tanah.
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Dams are structures that utilize soil as a construction material. In zoned embankment dams, there is a impermeable layer that serves as a barrier against seepage. Typically, clay soil is used for this layer. However, some clay soils used in this layer exhibit dispersive properties, making them susceptible to erosion and containing high levels of sodium ions. The high sodium content in the soil's pore water causes the soil particles to repel each other, leading to soil failure. The objective of this study is to investigate the influence of adding fly ash on soil dispersivity. The research methodology involves laboratory observations, including testing for dispersivity, physical properties, and mechanical behavior. Testing is conducted on natural soil and soil stabilized with fly ash at concentrations of 3%, 5%, 8%, 10%, and 12%. The results indicate that a 3% fly ash content with a 7-day soaking period yields the highest values for maximum dry unit weight, unconfined compressive strength, and the lowest coefficient of permeability. Double hydrometer and crumb tests confirm the effectiveness of a 3% fly ash content with a 7-day soaking period in reducing soil dispersivity below 30%, classifying it as non-dispersive soil. In conclusion, this study demonstrates that the optimal fly ash content to reduce soil dispersivity is 3% with a 7-day soaking period.

Item Type:	Thesis (Diploma)
Uncontrolled Keywords:	bendungan urugan, bahan timbunan, tanah dispersif, stabilisasi tanah, fly ash, embankment dam, fill material, dispersive soil, soil stabilization
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization T Technology > TC Hydraulic engineering. Ocean engineering > TC167 Dams, reservoirs T Technology > TN Mining engineering. Metallurgy > TN295 Fly ash
Divisions:	Faculty of Vocational > Civil Infrastructure Engineering (D4)
Depositing User:	Rillist Rimba Rani
Date Deposited:	02 Oct 2023 08:32
Last Modified:	02 Oct 2023 08:32
URI:	http://repository.its.ac.id/id/eprint/103725

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