Eco-Friendly Stabilization of Sulfate-Rich Expansive Soils using Geopolymers for Transportation Infrastructure
| 项目名称： | Eco-Friendly Stabilization of Sulfate-Rich Expansive Soils using Geopolymers for Transportation Infrastructure |
| 摘要： | When sulfate-rich expansive soils are treated with traditional calcium-based stabilizers such as lime or cement, the stabilized soil is affected by sulfate-induced heave, due to the formation of highly expansive mineral Ettringite and Thaumasite, which expand when it comes in contact with water. Since sulfate-rich soils are predominantly obtained in the South and Western U.S. and are widely used in these regions to construct pavements, alternative forms of stabilizing techniques are being sought after. In recent years, Geopolymer has received much attention as an alternative to Ordinary Portland Cement (OPC) and lime for soil stabilization, and other applications for pavements, bridges, and other transportation structures. This study will investigate the feasibility of stabilizing sulfate-rich expansive soils using Geopolymers. Effects of Geopolymer, dosage rates, and curing condition, on overall performance and structural and mechanical properties of Geopolymer-stabilized subgrade soils will be studied in order to optimize the use of Geopolymer derived from local waste and natural materials for transportation infrastructure. Volume change tests during wetting or drying and strength tests will be conducted on Geopolymer-stabilized soils that have significant sulfate concentration. Both material characterization studies related to micro to macro behavioral changes of native soils and Geopolymer-treated soils will be carried out. Sustainable, resiliency, and life cycle analysis of Geopolymer-stabilized subgrade soils rich in sulfate will also be evaluated. |
| 状态： | Completed |
| 资金： | 212000 |
| 资助组织： | Office of the Assistant Secretary for Research and Technology |
| 项目负责人： | Melson, Christopher |
| 执行机构： | University of Texas at Arlington<==>Texas A&M University, College Station |
| 开始时间： | 20190815 |
| 预计完成日期： | 20210215 |
| 主题领域： | Geotechnology；Highways；Materials；Pavements |
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