Evaluation of viscosity reduction using advanced agent in high-pressured grout injection for Bangkok soils | |
| Author | Sai Wunna Kyaw Khaung |
| Call Number | AIT Thesis no.GE-23-09 |
| Subject(s) | Soil stabilization--Thailand--Bangkok Grouting (Soil stabilization)--Thailand--Bangkok |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Geotechnical and Earth Resources Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | The construction of the MRT Purple Line, Section C2, in Bangkok, Thailand, faces significant challenges due to deep and hard cohesive soils composed of stiff clay and sand layers. These difficult ground conditions require an effective ground improvement technique to ensure the infrastructure's stability and safety. Jet grouting, a common method for ground improvement, encounters problems in deep and cohesive soils due to the high viscosity of discharged sludge, which impedes the process and results in lower quality construction products. In response to this issue, this research explores the use of chemical admixtures named as Admion, combined with locally available ordinary cement, to enhance the jet grouting process. The primary objective is to mitigate the challenges posed by stiff soil layers, improve the efficiency of the jet grouting process by reducing the viscosity of discharged sludge, and optimize overall ground improvement efforts. To achieve these goals, blending tests were conducted both in laboratory and field settings to examine the effects and specifications of the admixtures. Tests were performed on two soil types—the Bangkok’s second sand layer and the second stiff clay layer—using two types of admixtures: FAJ-20 (Naphthalene sulfonic acid type) and HPX-50 (Naphthalene sulfonic acid Polycarboxylic acid type). Laboratory tests focused on flowability of grout materials, bleeding characteristics, and unconfined compressive strength (UCS) of the grouts. Field tests included viscosity testing of the discharged sludge and UCS strength of the improved columns. This research provides valuable insights for future ground improvement projects in Bangkok, particularly concerning the applicability of jet grouting methods with chemical admixtures in stiff cohesive soils. |
| Year | 2024 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical and Earth Resources Engineering (GTE)/Former name = Geotechnical Engineering (GE) |
| Chairperson(s) | Chao, Kuo Chieh |
| Examination Committee(s) | Avirut Puttiwongrak |
| Scholarship Donor(s) | AIT Scholarships |
| Degree | Thesis (M. Sc.) - Asian Institute of Technology, 2024 |