Geochemical effects on some of the engineering properties of soft Bang Phli clay | |
| Author | Ngen, Kok Kim |
| Call Number | AIT Thesis no.GT-86-04 |
| Subject(s) | Soils--Thailand--Testing Soil mechanics |
| Note | A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | Bangkok Clay at Bang Phli is characterized as a sensitive clay with montmorillonite as the predominant clay mineral. It has high cation exchange capacity, moderate organic matter and carbonate content. The salt content with values ranges from 15 g/l at depth of 3 m to 30 g/l at depth of 9 m. Sodium chloride is the main dissolved ion in the pore water, followed by magnesium, bicarbonate, potassium, calcium and sulfate in the decending order. Under special storage procedure, some signs of aging were observed in the clay sample. The sample changes its original dark greenish grey color into brownish. With time, the remolded strength and liquid limit increased whereas plasticity index and soil pH decreased. The plastic limit and water content were practically unchanged. The pore water concentration of calcium, magnesium and sulfate were increased significantly whereas the bicarbonate concentration reduced markedly. This aging phenomenon is attributed to the oxidation of iron sulfide which results in the formation of yellow iron hydroxide and sulfuric acid. The sulfuric acid will then dissolve the carbonate which was produced by the oxidation of organic matter, thus increase the divalent cations in the clay. This will reduce the interparticle forces and increase the remolded strength. Generally, the sulfur cycle which involves the process of oxidation and reduction of sulfur species plays an important role in the determination of the properties of marine clay. |
| Year | 1987 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Geotechnical and Transportation Engineering (GT) |
| Chairperson(s) | Balasubramaniam, A.S. |
| Examination Committee(s) | Prinya Nutalaya ;S. Chandra |
| Scholarship Donor(s) | The Government of Australia |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1987 |