Implementation of New Specifications Requirements for Coarse Backfill Materials for Mechanically Stabilized Earth (MSE) Walls
| 项目名称： | Implementation of New Specifications Requirements for Coarse Backfill Materials for Mechanically Stabilized Earth (MSE) Walls |
| 摘要： | The service life of mechanically stabilized earth (MSE) walls depends on the rate of corrosion of the metal reinforcements used in their construction. Assessment of corrosion potential requires the accurate evaluation of pH, resistivity, and ionic (e.g., sulfate and chloride) concentrations of aqueous solutions in contact with the surrounding aggregate. There is a tendency to utilize larger-size aggregates that contain only a small amount of fine material (passing No. 40 sieve) in the backfill. Evaluation of the electrochemical parameters of coarse aggregates is challenging because traditional methods utilize only fine-grained material. Testing demonstrated that the fines collected from the field were enriched in chemicals that when exposed to water decreased pH and resistivity and increased chloride or sulfate concentrations relative to the bulk rock. This phenomenon can bias traditional soil testing results and therefore the assessment of corrosion potential. A more representative and appropriate geochemical testing protocol is recommended by Texas Department of Transportation (TxDOT) research project 0-6359: Characterization of Backfill Materials for Prevention of Corrosion of MSE Wall Metallic Earth Reinforcement which concluded August 31, 2012. |
| 状态： | Completed |
| 资金： | 365000 |
| 资助组织： | Texas Department of Transportation |
| 项目负责人： | Steele PMP, CTCM, Joanne |
| 执行机构： | The University of Texas at El Paso |
| 主要研究人员： | Nazarian, Soheil |
| 开始时间： | 20150814 |
| 预计完成日期： | 20180831 |
| 实际结束时间： | 0 |
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