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首页> 外文期刊>Transportation Research Record >Interlayer and Design Considerations to Retard Reflective Cracking
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Interlayer and Design Considerations to Retard Reflective Cracking

机译：延迟反射裂缝的中间层和设计考虑

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摘要

To protect the structure and provide a new, smoother riding surface, many highway agencies overlay deteriorating portland cement concrete pavements with hot-mix asphalt (HMA) overlays. Reflective cracking through the overlays has been a persistent problem. Most methods that are used to delay the cracks have been based on tension (the horizontal movement occurring at the crack or joint interface). A performance-related flexural fatigue test addresses the tension, shear, and bending forces that result in reflective cracks. A reflective crack relief system consisting of an impermeable, highly elastic interlayer that uses fine-graded aggregates and a quality HMA overlay has been specified with flexural fatigue for crack resistance and Hveem stability for rutting resistance. Preliminary cracking data from several projects that used the specification and their control sections show that reflective cracking is delayed. Cores taken from the test sections show that even when the overlay cracks, the interlayer remains intact and impermeable, protecting the pavement structure from moisture intrusion. These cores also show that, unlike those in the control sections, the reflective cracks over the new system are offset from the underlying joints and further disrupt paths for water and giving better rideability. Seven state departments of transportation have used the performance-related specification for constructing the interlayer and overlay.
机译：为了保护结构并提供新的，更平滑的行驶表面，许多公路机构都在使用热拌沥青（HMA）覆盖层覆盖恶化的波特兰水泥混凝土路面。覆盖层的反射裂纹一直是一个长期存在的问题。用于延迟裂纹的大多数方法都是基于张力（在裂纹或接头界面处发生水平移动）。与性能相关的弯曲疲劳测试解决了导致反射裂纹的拉力，剪切力和弯曲力。反射型裂纹消除系统由不透水的，高弹性的中间层组成，该中间层使用精细的集料和优质的HMA覆盖层，已被指定具有弯曲疲劳性（用于抗裂性）和Hveem稳定性（用于抗车辙）。来自使用该规范及其控制部分的多个项目的初步裂纹数据表明，反射裂纹已延迟。取自测试部分的岩心显示，即使覆盖层开裂，中间层仍保持完整且不可渗透，从而保护了路面结构不受潮气侵入。这些核心也表明，与控制部分不同，新系统上的反射裂缝从下面的接缝处偏移，进一步破坏了水的路径并提供了更好的乘坐性。七个州交通运输部门已使用与性能相关的规范来构造中间层和覆盖层。

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