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Development of a Profile-Based Smoothness Specification for Asphalt Concrete Overlays (Revised); Summary rept. Sep 93-Aug 97
| 题名： | Development of a Profile-Based Smoothness Specification for Asphalt Concrete Overlays (Revised); Summary rept. Sep 93-Aug 97 |
| 作者： | Fernando, E. G. |
| 关键词： | Asphalt pavements; Overlays; Smoothness; Surface roughness; Flexible pavements; Profilometers; Specifications; Quality control; Construction materials |
| 摘要： | The Texas Department of Transportation (TxDOT) is implementing smoothness specifications based on profilograph testing as part of its construction quality control/quality assurance (QC/QA) program. To improve upon the existing test method, TxDOT sponsored a research project with the Texas Transportation Institute (TTI) to develop a smoothness specification for asphalt concrete overlays based on the current generation of profiling equipment which offer better accuracy and repeatability than the profilograph. To develop this specification, researchers evaluated the relationship between pavement profile and predicted overlay life assuming reflection cracking as the primary failure mechanism. This relationship is evaluated in two steps. First, the effect of surface profile on predicted dynamic loads is determined by vehicle simulation. Then, the effect of dynamic load variability on predicted pavement life is analyzed, This work led to the development of a relationship between the predicted change in pavement life associated with the placement of the overlay, dynamic load variability, and the fracture parameter, n, of the asphalt overlay mixture. |
| 总页数： | 168p |
| 报告类型： | 科技报告 |
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