Standardizing Lightweight Deflectometer Measurements for QA and Modulus Determination in Unbound Bases and Subgrades
| 项目名称： | Standardizing Lightweight Deflectometer Measurements for QA and Modulus Determination in Unbound Bases and Subgrades |
| 摘要： | The primary objective of this study is to provide State Departments of Transportation (DOTs) and local government engineers with a practical and theoretically sound methodology for the evaluation of in-place elastic modulus of unbound layers, subgrades, and other earthwork from Lightweight Deflectometer (LWD) field test data. This will require the development of techniques to fully account for: (1) the influence of moisture suction pressures on LWD measurements; (2) the differences in the LWD induced stress states/strain levels and the stress states/strain levels induced by construction equipment and long term traffic loads; and (3) the effects of layering on LWD measurements when testing on finite-thickness layers (e.g., base or subbase over subgrade) vs. half-space conditions (e.g., subgrade). The test standards and analysis methodologies developed in this study will enable agencies to: (a) use LWDs with confidence for construction quality assurance (QA); (b) develop catalogs of appropriate design modulus values for use in pavement structural design, specifically in the Mechanistic-Empirical Pavement Design Guide, (MEPDG) and its companion DARWin-ME software; and (c) reduce recurring annual costs associated with QA inspection of soils and unbound materials. |
| 状态： | Completed |
| 资金： | 400000 |
| 资助组织： | Michigan Department of Transportation<==>Missouri Department of Transportation<==>Virginia Department of Transportation<==>South Carolina Department of Transportation<==>North Carolina Department of Transportation<==>New York State Department of Transportation<==>Florida Department of Transportation<==>Maryland Department of Transportation State Highway Administration |
| 项目负责人： | Hardt, Allison |
| 开始时间： | 20211013 |
| 实际结束时间： | 20161130 |
| 主题领域： | Highways；Pavements |
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