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Use of Nondestructive Evaluation to Detect Moisture in Flexible Pavements
| 题名： | Use of Nondestructive Evaluation to Detect Moisture in Flexible Pavements |
| 作者： | Diefenderfer, B. K.; Mokarem, D. W.; Sharp, S. R. |
| 关键词： | Flexible pavements##Moisture damage##Pavement damage##Nondestructive tests##Virginia##Ground-penetrating radar##Moisture content##Subgrades##Surveys##Sampling##Hot-mix asphalts##Dielectric properties##Data collection##Asphalt pavements##Moisture sensitivity## |
| 摘要： | The purpose of this study was to identify the currently available nondestructive evaluation technology that holds the greatest potential to detect moisture in flexible pavements and then apply the technology in multiple locations throughout Virginia. Ground-penetrating radar (GPR) was chosen for use in a field investigation because of its ability to measure large areal extents and reports of successful implementation by other researchers. This technology was used to determine the moisture content of the subgrade beneath five flexible pavement sections in Virginia. The GPR survey was conducted at normal driving speeds, and data were collected at a sampling rate of 1 scan per foot. For each site, three scans were collected in the travel lane (in the right wheel path, the center of the lane, and in the left wheel path). Existing passing lanes were also scanned. Initial data processing subdivided each pavement section into a three-layer system composed of the hot-mix asphalt layers, the aggregate base layers, and the subgrade. The processing also included calculating the dielectric constant of each layer. These raw data were used to conduct further analyses considering data from only the subgrade. The data were normalized to highlight those areas with the highest dielectric constants since it is known that moisture will have the greatest influence on the dielectric properties of the material. |
| 总页数： | 38 |
| 报告类型： | 科技报告 |
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