Synthesis of Information Related to Highway Practices. Topic 51-07. Practices for Assessing and Mitigating the Moisture Susceptibility of Asphalt Pavements
| 项目名称： | Synthesis of Information Related to Highway Practices. Topic 51-07. Practices for Assessing and Mitigating the Moisture Susceptibility of Asphalt Pavements |
| 摘要： | Moisture-induced damage of asphalt pavements is a national problem; millions of dollars are spent each year on maintenance of flexible pavements. In general, moisture damage involves physical, chemical, mechanical, and thermodynamic processes, all occurring within the asphalt mixture at different magnitudes and rates. Some of the mechanisms of moisture damage include adhesion failure between asphalt and aggregate, cohesion failure within the asphalt binder, emulsification of the asphalt, freezing of entrapped water, and cohesion degradation within the aggregate. Different agencies and research groups are continually searching for methods that can be used to identify and prevent potential moisture damage in asphalt pavements. Most of the methods adopted by state departments of transportation (DOT) focus on testing asphalt mixtures and the adhesive bond between the aggregate and the asphalt binders. Some agencies use prescriptive methods, such as requiring the use of liquid additives, hydrated lime, or materials-based specifications. Agencies are also looking into other practices to help assess moisture damage, such as the MIST device, surface free energy analyses, and asphalt chemical analyses. The objective of this synthesis is to document current practices used by DOTs to assess and mitigate the potential for moisture-induced damage in asphalt pavements. The study will focus on asphalt mix design and acceptance. Information will be gathered through literature review, a survey of DOTs, and interviews with selected agencies for the development of case examples. The survey should be directed to DOT voting members of the AASHTO Committee on Materials and Pavements. Knowledge gaps and suggestions for research to address those gaps will be identified. |
| 状态： | Active |
| 资金： | 45000 |
| 资助组织： | National Cooperative Highway Research Program<==>Federal Highway Administration<==>American Association of State Highway and Transportation Officials (AASHTO) |
| 项目负责人： | Gause, Jo Allen |
| 执行机构： | Purdue University |
| 开始时间： | 20190924 |
| 主题领域： | Highways；Maintenance and Preservation；Pavements |
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