Thermal conductivity of saturated clay by needle probe method | |
| Author | San San |
| Call Number | AIT Thesis no.GE-04-02 |
| Subject(s) | Soils--Effect of temperature on Soils--Thermal properties |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-04-02 |
| Abstract | This study was directed to investigate the thermal conductivity of two saturated clays, namely; soft Bangkok clay and Kaolin clay using needle probe method constructed according to ASTM standard (unsteady state method). The vertical and horizontal thermal conductivity of undisturbed and remolded soft Bangkok clay specimens and remolded Kaolin clay specimens were measured at different void ratio by raising the vertical effective stress in Rowe cell apparatus. The experimental results show the effect of stress level on the anisotropy behavior of the thermal conductivity. Moreover, sensitivity study has been conducted using numerical approach in order to investigate the effect of line heater diameter and the thermal conductivity of soil on the heat profile. The thermal conductivity for all clay increases with decreasing void ratio. The increasing trend for remolded clay and kaolinite are same and both exhibit the nearly isotropic thermal conductivity at higher void ratio condition. For the undisturbed clay, anisotropic in thermal conduction exist at initial condition of before consolidation. The numerical study shows that as the heater radius increases shorter time is required to raise the soil temperature up to certain level at constant distant from the heater point. Moreover, as the thermal conductivity increase the steepness of the heat profile surrounding heating point decreases. Finally, experiment results of heat transfer through undisturbed soft Bangkok clay specimen (diameter= 200 mm) due to line heat source (T=90°C) have been used to back calculate the thermal conductivity of soft Bangkok clay. The results show that the ratio between the back calculated thermal conductivity and the measured thermal conductivity is about 1.5. |
| Year | 2005 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-04-02 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Chairperson(s) | Bergado, Dennes T.; |
| Examination Committee(s) | Noppadol Phien-wej; Pham Huy Giao; |
| Scholarship Donor(s) | Asian Institute of Technology Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2005 |