Snodi, Lamyaa Najah (2015) Improvement of Tikrit Gypseous Soil Using Soil Replacement and Additives. PhD thesis, Universiti Sains Malaysia.
![[img]](http://eprints.usm.my/style/images/fileicons/application_pdf.png)
|
PDF
- Submitted Version
Download (493kB) | Preview |
Abstract
Gypsum telah menimbulkan masalah besar dalam pembinaan yang membawa kepada pengurangan dalam kekuatan ricih dan keruntuhan secara tiba-tiba apabila ia bercampur dengan air atau cecair. Kajian ini mengkaji ciri-ciri tanah yg mengandungi gypsum dari Tikrit, Iraq di mana kandungan gipsumnya adalah kira-kira 51% daripada tanah. Tanah yg mengandungi gypsum ini diklasifikasikan sebagai pasir bergred buruk (SP) mengikut Sistem Pengelasan Tanah bersatu (USCS). Tanah yang digunakan untuk kaedah penggantian tanah adalah Pasir berkelodak (SM) dan Kelodak berpasir keplastikan Rendah (ML). Peratusan penggantian tanah adalah 5 hingga 50% mengikut berat tanah yang mengandungi gypsum digunakan untuk kajian. Bahan tambah kimia seperti Styrene Butadiene Rubber (SBR) dan Kapur dicampurkan sebanyak 1.25%, 2.5% dan 5%, bagi Geopolimer di campurkan sebanyak 2.5% keatas tanah gypsum. Waktu pengawetan adalah selama 7, 14 dan 28 hari telah dipertimbangkan untuk kesemua campuran dan beberapa sampel telah digunakan untuk mengkaji kesan larut lesap bertujuan mengkaji variasi jumlah garam larut (TSS%). Ujian fizikal dan kejuruteraan untuk semua campuran telah dijalankan dengan sewajarnya, hasil kajian ini menunjukkan bahawa keplastikan tanah yang dirawat telah meningkat dan kebolehkerjaan tanah bertambah baik. Keputusan ujian pemadatan menunjukkan bahawa ia mengurangkan ketumpatan kering maksimum, kandungan lembapan optimum meningkat dengan kegunaan kandungan bahan tambahan yang lebih banyak. Pekali kebolehtelapan dan keruntuhan didapati berkurangan apabila menggunakan kaedah penggantian tanah, manakala apabila ditambah bahan tambahan kimia ia berkurangan. Nilai kekuatan tanah telah bertambah baik untuk kedua-dua penggantian tanah (SM dan ML) pada 10% tanah yg mengandungi gypsum. Keputusan kajian menunjukkan bahawa bahan tambahan kapur memberikan kesan yang baik untuk penstabilan tanah dan menambah baik kebolehkerjaan dan kekuatannya. Hasil ujian pembelauan sinar-X (XRD) mengesahkan interaksi kimia menunjukkan fasa baru yang terdiri daripada produk baru penyimenan bahan kimia dengan tanah yg mengandung gypsum. ________________________________________________________________________________________________________________________ Gypsum has posed great problems in construction that lead to reduction in shear strength and sudden collapse whenever it mixes with water or any liquid. This study investigates the characteristics of Gypseous soil from Tikrit, Iraq where the gypsum content of approximately 51 % of soil. This Gypseous soil is classified as poorly graded sand (SP) according to Unified Soil Classification System (USCS). The soils used for soil replacements method are of Silty Sand (SM) and Low plasticity Sandy Silt (ML). The percentages of soil replacement of 5 to 50 % by weight of Gypseous soil were studied. The chemical additives were added such as Styrene Butadiene Rubber (SBR) and Lime at 1.25 %, 2.5 % and 5 %, as for Geopolymer was used at 2.5 % for the improvement of this Gypseous soil. Curing times of 7, 14 and 28 days were considered for the soil replacement and some sample were used to study the leaching effect by means of studying the variation of total soluble salts (T.S.S %). Physical and engineering tests for all the soil replacement were done accordingly, the result shows that the plasticity of treated soil was increased and improved the soil workability. The compaction test result shows that as it decreases in maximum dry density, the optimum moisture content increase with greater content of additives used. The permeability coefficient and the collapsibility were found to be decreases when using soil replacement method, whereas when added chemical additives it decreases. Strength value of soil was improved for both soil replacements (SM and ML) at 10% of Gypseous soil. The results imply that Lime additives provide beneficial effect for soil stabilization and improved workability and its strength. The X-Ray Diffraction (XRD) test result confirmed the chemical interactions show that the new phases consists of new cementation products of the chemical additives with Gypseous soil.
| Item Type: | Thesis (PhD) |
|---|---|
| Additional Information: | Full text is available at http://irplus.eng.usm.my:8080/ir_plus/institutionalPublicationPublicView.action?institutionalItemId=2123 |
| Subjects: | T Technology T Technology > TA Engineering (General). Civil engineering (General) > TA1-2040 Engineering (General). Civil engineering (General) |
| Divisions: | Kampus Kejuruteraan (Engineering Campus) > Pusat Pengajian Kejuruteraan Awam (School of Civil Engineering) > Thesis |
| Depositing User: | Mr Mohd Jasnizam Mohd Salleh |
| Date Deposited: | 14 Jun 2018 02:24 |
| Last Modified: | 14 Jun 2018 02:24 |
| URI: | http://eprints.usm.my/id/eprint/40787 |
Actions (login required)
 |
View Item |
