Agustina, Cornella Shintya (2022) Pengaruh Penggunaan Geopolimer Berbasis High-Calcium Fly Ash Dengan Variasi Kadar Fly Ash Dan Waktu Pemeraman Sebagai Bahan Stabilisasi Tanah Lempung Di Wilayah Surabaya Timur. Diploma thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Tanah lempung merupakan jenis tanah yang memiliki plastisitas yang tinggi dan potensi kembang susut tanah yang besar, sehingga perlu dilakukan stabilisasi tanah. Stabilisasi tanah secara kimiawi adalah memperbaiki sifat-sifat tanah dengan menambahkan bahan kimia seperti kapur, fly ash, semen, dan bahan kimia lainnya guna menaikkan kekuatan tanah. Penelitian ini menggunakan stabilisasi kimiawi dengan geopolimer. Geopolimer berbasis fly ash telah dipelajari sebagai alternatif untuk pengganti semen yang telah menunjukkan peningkatan kekuatan tekan, susut rendah, dan emisi CO2 rendah. Penelitian tugas akhir ini memfokuskan stabilisasi tanah dengan menggunakan geopolimer berbasis high-calcium fly ash dengan variasi kadar fly ash yaitu 10%, 20%, dan 30% terhadap berat tanah kering. Tiga variasi waktu pemeraman diambil waktu 1, 3, dan 7 hari. Alkali aktivator yang digunakan adalah campuran natrium silikat (Na2SiO3) dan natrium hidroksida (NaOH) dengan konsentrasi molaritas sebesar 8 M. Molarits akhir pada penelitian ini mengalami perubahan karena adanya penambahan air. Pengaruh penambahan geopolimer ditinjau terhadap sifat fisik dan sifat mekanik dari kondisi tanah lempung sebelum dan sesudah stabilisasi pada tanah lempung di wilayah Surabaya Timur. Penelitian melakukan uji Atterberg Limit untuk memperoleh sifat fisik dan uji standar proktor, UCT (Unconfined Compression Test), dan Swelling Potential Test untuk memperoleh sifat mekanik tanah. Tanah kondisi inisial memiliki klasifikasi tanah lempung dengan plastisitas tinggi. Penambahan optimal bahan stabilisasi geopolimer berbasis high-calcium fly ash yang didapatkan yaitu pada kadar fly ash 20% dan waktu pemeraman 7 hari. Perubahan dari tanah inisial ke tanah stabilisasi dengan parameter yang ditinjau berupa indeks plastisitas tanah (IP) menurun sebesar 110,24% dari tanah inisial, kadar air optimum (KAO) menurun sebesar 10,23% dari tanah insial, berat volume kering maksimum (γdmaks) meningkat sebesar 5,33% dari tanah inisial. Nilai kuat tekan (qu) meningkat hingga 479,70% dibandingkan dengan tanah inisial. Nilai swelling potential menurun sebesar 86,39% dari tanah inisial dan nilai swelling pressure menurun sebesar 87,92% dari tanah inisial. Hasil permodelan tanah menggunakan software Plaxis menunjukkan nilai perpindahan total tanah stabilisasi menurun 42,03% dari tanah inisial, nilai safety factor meningkat sebesar 79,60% dari tanah inisial. Sedangkan menggunakan software Slope Stability GEO5 menunjukkan nilai safety factor tanah stabilisasi meningkat sebesar 77,87% dari tanah inisial.
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Clay soil is a type of soil that has high plasticity and a large potential for swelling and shrinkage of the soil, so soil stabilization is necessary. Chemical soil stabilization is improving soil properties by adding chemicals such as lime, fly ash, cement, and other chemicals to increase soil strength. This research uses chemical stabilization with geopolymer. Fly ash based geopolymers have been studied as an alternative to cement substitutes which have shown increased compressive strength, acid resistance, low shrinkage, and low CO2 emissions. This final project focuses on soil stabilization by using geopolymer based on high- calcium fly ash with variations in fly ash of 10%, 20%, and 30% of dry soil weight. Three variations of curing time were taken 1, 3, and 7 days. The alkaline activator used is a mixture of sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) with a molarity concentration of 8 M. The final molarity in this study changed due to the addition of water. The effect of adding geopolymer in terms of physical and mechanical properties of clay soil conditions before and after stabilization of clay soils in East Surabaya. The study carried out the Atterberg Limit to obtain physical properties and standard proctor test, UCT (Unconfined Compression Test), and Swelling Potential Test to obtain soil mechanical properties. The initial condition soil is classified as clay with high plasticity. The optimal addition of geopolymer stabilization material based on high-calcium fly ash obtained was at a fly ash 20% and a curing time of 7 days. Changes from initial soil to stabilizing soil with the parameters reviewed in the form of soil plasticity index (IP) decreased by 110,24% from initial soil, optimum water content (KAO) decreased by 10,23% from initial soil, maximum dry volume weight (γdmax) increased by 5,33% from the initial soil. The value of compressive strength (qu) increased up to 479,70% compared to the initial soil. The swelling potential decreased by 86,39% from the initial soil and the swelling pressure decreased by 87,92% from the initial soil. The results of soil modeling using software show the total displacement value of the stabilizing soil decreased by 42,03% from the initial soil, the safety factor increased by 79,60% from the initial soil. Meanwhile, using software the Slope Stability GEO5 safety factor increased by 77,87% from the initial soil.
| Item Type: | Thesis (Diploma) |
|---|---|
| Additional Information: | RSIS 624.151 363 Agu p-1 2022 |
| Uncontrolled Keywords: | alkali aktivator, fly ash, geopolimer, stabilisasi tanah, swelling potential, UCT, waktu pemeraman. alkaline activator, fly ash, geopolymer, soil stabilization, swelling potential, UCT, curing time. |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Faculty of Vocational > 22301-Civil Infrastructure Engineering (D4) |
| Depositing User: | Mr. Marsudiyana - |
| Date Deposited: | 14 Jul 2026 02:48 |
| Last Modified: | 14 Jul 2026 02:48 |
| URI: | http://repository.its.ac.id/id/eprint/134868 |
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