Durability of Pipe Materials in Soils
| 项目名称： | Durability of Pipe Materials in Soils |
| 摘要： | A large number culvert pipes are installed every year in North Carolina. While the loading and structural requirements for these pipes are considered during the selection process, the exposure condition of these culverts receives less attention. Many pipe choices exist including reinforced concrete, galvanized steel, aluminum, aluminized, and various types of plastic. Choosing the right pipe for the right installation is a non-trivial task that carries significant financial impact. Factors such as structural capacity, environmental durability, anticipated life-span, required pipe size, site conditions, and available construction expertise are all important when selecting a pipe. Existing NCDOT selection tables provide some limited guidance, but often result in highly-conservative selections being made, particularly from the perspective of matching pipe materials to site environmental conditions. Selection of the wrong pipe material (or an overly-conservative pipe material) can result in significant excess cost. If materials degrade too quickly, costly re-work is required, and additional costs and risks may be incurred due to reduced performance of the degraded pipe. If high-cost and high-performance materials are selected in areas where they are not needed, then initial construction costs can increase dramatically. For example, in many situations, aluminized corrugated steel pipe can likely provide the same useful service life as corrugated aluminum pipe at a dramatically reduced cost. Aluminum pipe may be justified in regions with salt-water exposure, however, it is likely an overconservative choice for regions where contact with salt will be incidental. Accounts from NCDOT personnel have indicated widespread use of aluminum pipe in regions where it is likely not needed (i.e., regions with limited salt exposure). Given current limitations in the information available to support the selection of pipe materials, more detailed and elaborate selection criteria are needed. These criteria should account for exposure conditions such as the presence of salt, the soil pH, and the possible presence of contaminants, including more common contaminants such as fertilizers. In addition, factors such as installation requirements (e.g., slope), resistance to fire, and the potential for future disposal need to be considered. Finally, the required service life should be factored into pipe material selection. In some instances, the required service life can be short due to expected future development, while in other instances, the required service life can be 30 years or more. |
| 状态： | Active |
| 资金： | 299,710 |
| 资助组织： | North Carolina Department of Transportation |
| 项目负责人： | Kirby, John |
| 执行机构： | North Carolina State University |
| 开始时间： | 20190801 |
| 预计完成日期： | 20210731 |
| 主题领域： | Bridges and other structures |
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