| Author | Phurika Phothiraksanon |
| Call Number | AIT Thesis no. GE-00-19 |
| Subject(s) | Soil consolidation test
|
| 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-00-19 |
| Abstract | Electro-osmotic (EO) consolidation of Bangkok clay using copper and
carbon electrode prefabricated vertical drain (PVD) was studied. Laboratory
testing programs were conducted on undisturbed and reconstituted sample in
small cylinder cell and large consolidometer. The tests were performed under
voltage gradient 60 and 120 V /m with 24 hrs polarity reversal. The physical,
chemical and pullout test of PVD were conducted before and after electro-osmotic
(EO) consolidation. The results indicated that the time to achieve 90% degree of
consolidation range from 1.3 to 2.1 and 1.8 to 2.1 times faster than the normal
consolidation using PVD only for undisturbed and reconstituted sample,
respectively. The magnitude of pullout resistance generated using electro-osmotic
drain was 1.5 to 2.0 and 1.5 to 3.1 times higher than that of using PVD only for
undisturbed and reconstituted sample, respectively. Higher reduction of water
content and increase in shear strength were obtained after electro-osmotic (EO)
consolidation. The carbon electrode achieves faster rate of consolidation and more
settlement than copper electrode. The liquid limit, plastic limit and plasticity
index were increased because of increased of salinity. Compared the increase of
settlement, shear strength and pullout resistance between high voltage gradient
(120 V/m) and low voltage gradient (60 V/m). The results show that the increase
of voltage gradient was 100%, gut the increase of settlement, shear strength and
pullout resistance were 33%, 9% and 32% for undisturbed sample. It implied that
using low voltage gradient was enough for electro-osmotic consolidation. And at
low voltage gradient is more efficient than high voltage gradient. The application
of electro-osmosis decreased electro-conductivity. On the other hand, the increase
of pH value, salinity and organic matter were found in soil sample after improving
by electro-osmotic consolidation. The current density decreased with time due to
the increase of the soil resistivity. The temperature slightly increased at low
voltage gradient but lower than the increase of temperature at high voltage
gradient. |
| Year | 2001 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-00-19 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Bergado, D.T.; |
| Examination Committee(s) | Balasubramaniam, A.S.;Miura, Kinya; |
| Scholarship Donor(s) | Burapha University ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2001 |