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Guidelines for the Use of Underseals as a Pavement Moisture Barrier: Summary Report.
| 题名： | Guidelines for the Use of Underseals as a Pavement Moisture Barrier: Summary Report. |
| 作者： | estakhri, c. k. ramakrishnan, s. |
| 关键词： | research projects, seals, literature review, surveys, deterioration, water infiltration, recommendations |
| 摘要： | Placement of an asphalt seal coat between layers of asphalt mixtures is considered beneficial and necessary. Pavement designs may call for application of a seal prior to overlaying the pavement (commonly called an underseal) to provide an impervious membrane to stop the intrusion of surface or subsurface moisture. The designer may specify the seal to enhance bonding with subsequent layers. However, at the onset of this project, many engineers felt that premature cracking (Figure 1), rutting, stripping, and flushing or bleeding (Figure 2) have occurred on highway pavements because the underseal was installed. Microsurfacing has also been associated with premature failures. Therefore, the Texas Department of Transportation (TxDOT) felt a need to understand the mechanisms that make a seal beneficial and when a seal may lead to a premature failure of the pavement layers above or below. The objective of this research project was to develop the criteria needed to determine when and where to place an underseal. / NOTE:Summary rept. |
| 总页数： | u0708；4p |
| 报告类型： | 科技报告 |
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