ABSTRACT

Newly laid asphalt must be adequately cool before it can be trafficked to prevent the development of costly premature damage. Selecting an appropriate traffic-opening temperature of newly laid asphalt airport runway overlay would avoid early damage – while also minimising the disruption to the airport service due to prolonged runway closure in a busy airport. This study aims to investigate the allowable traffic-opening temperature of freshly paved asphalt during nighttime construction through a series of laboratory tests with regard to asphalt rutting and interface shear failure potential. Additionally, a transient heat transfer model is developed to study the cooling response of freshly laid asphalt and, along with stress analysis, used to deduce the effect of selected critical traffic opening to traffic on airport closure. The results suggest that mixtures with polymer-modified bitumen (PMB) can be re-opened to air traffic at a considerably higher temperature (up to 80°C) than conventional traffic-opening temperature as set by many agencies (60°C). This result encourages airport authorities and agencies to be more adaptive with the traffic-opening temperature specification, particularly for asphalt with PMBs. For the cases studied, raising the critical trafficking temperature would reduce the runway/airport closure during nighttime construction by 17–114 minutes (26–63% reductions).

摘要

新铺设的沥青在运输之前必须充分冷却，以防止发生代价高昂的过早损坏。为新铺设的沥青机场跑道覆盖层选择合适的通航开放温度可以避免早期损坏，同时还可以最大限度地减少由于繁忙的机场跑道长时间关闭而对机场服务造成的干扰。本研究旨在通过一系列有关沥青车辙和界面剪切破坏潜力的实验室试验，研究夜间施工期间新铺沥青的允许通车温度。此外，还开发了一个瞬态传热模型来研究新铺设的沥青的冷却响应，并与应力分析一起用于推断选定的关键交通开放对机场关闭的影响。结果表明，与许多机构设定的常规交通开放温度（60°C）相比，聚合物改性沥青（PMB）的混合物可以在比传统交通开放温度（60°C）高得多的温度（高达80°C）下重新开放给空中交通。这一结果鼓励机场当局和机构更好地适应交通开放温度规范，特别是对于带有 PMB 的沥青。对于所研究的案例，提高临界运输温度将使夜间施工期间的跑道/机场关闭时间减少 17-114 分钟（减少 26-63%）。这一结果鼓励机场当局和机构更好地适应交通开放温度规范，特别是对于带有 PMB 的沥青。对于所研究的案例，提高临界运输温度将使夜间施工期间的跑道/机场关闭时间减少 17-114 分钟（减少 26-63%）。这一结果鼓励机场当局和机构更好地适应交通开放温度规范，特别是对于带有 PMB 的沥青。对于所研究的案例，提高临界运输温度将使夜间施工期间的跑道/机场关闭时间减少 17-114 分钟（减少 26-63%）。