Use of Tamper Bar Paver to Place Thick Lift Asphalt Concrete Pavement (ACP)
| 项目名称： | Use of Tamper Bar Paver to Place Thick Lift Asphalt Concrete Pavement (ACP) |
| 摘要： | Asphalt concrete placement specifications have maximum allowable lift thicknesses to ensure adequate mixture compaction. When the design thickness exceeds this limit, placement must be phased in multiple lifts, creating other problems: - Increased construction time, traffic exposure, and traffic disruption; - Potentially worse performance from poor stiffness/bonding at the lift interface. In 2018, an Atlanta District contractor experimented with a tamper bar paver for single-lift placement of Superpave Type C at four (4) to six (6) inches thick. Both the top and bottom of the lift had acceptable air void contents. Further study of tamper bar pavers for thick-lift construction is warranted. The research team will: 1) Review the literature for performance of tamper bar pavers in thick-lift placement and recommended maximum lift-thicknesses. 2) Develop a field-based testing plan that considers different construction scenarios, paver types, number of lifts, total thickness, tamper bar settings, and roller patterns. 3) Construct test sections and evaluate in-place air voids with traditional methods and innovative methods like full-coverage Ground Penetrating Radar (GPR) based density testing and Computed Tomography (CT) X-ray scanning. Also evaluate pavement profile roughness, and stiffness and cracking performance of cores. 4) Statistically analyze the data. 5) Develop guidelines for the use of tamper bar pavers, highlighting best practices and limitations. |
| 状态： | Active |
| 资金： | 412634 |
| 资助组织： | Texas Department of Transportation<==>Federal Highway Administration |
| 项目负责人： | Schwerdt, Tom |
| 执行机构： | Texas Transportation Institute |
| 开始时间： | 20191206 |
| 预计完成日期： | 20220630 |
| 主题领域： | Construction；Maintenance and Preservation |
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