The Full Depth Reclamation (FDR) technique has recently become a popular rehabilitation method to reconstruct old flexible pavement. Pulverized existing roadway materials are blended with stabilizing agents such as foamed asphalt and Portland cement to form a stiff base course for the new pavement. In Georgia, Portland cement is commonly used as a stabilizing agent for FDR stabilization. One of the challenges in FDR stabilization projects is to achieve uniform stiffness throughout the stabilized layer. FDR mix design often specifies a fixed rate of stabilizing agent, which could generate a range of FDR strengths due to the inherent variability in the existing pavement. Stiffness variation in the stabilized base should be minimized for optimum long-term pavement performance. This study investigates the influence of the variability in the FDR base layer stiffness on pavement performance. A series of field and laboratory tests were performed on a pavement reconstruction project in Georgia to assess variability. Tests included Unconfined Compressive Strength (UCS) tests and deflection tests with a Light Weight Deflectometer (LWD) and Falling Weight Deflectometer (FWD). Mechanistic sensitivity analyses were performed based on the field and laboratory test results to investigate the effect of variability in FDR properties on pavement performance. The results indicate both the FDR base thickness and strength have a significant influence on the predicted pavement responses. Findings presented here will be of interest to pavement engineers involved in the design and performance modeling of FDR pavement.

全深度开垦（FDR）技术最近已成为一种流行的修复方法，用于重建旧的柔性路面。将粉状的现有道路材料与稳定剂（例如泡沫沥青和波特兰水泥）混合在一起，以形成新路面的坚硬基础。在乔治亚州，波特兰水泥通常用作稳定FDR的稳定剂。FDR稳定项目的挑战之一是要在整个稳定层中获得均匀的刚度。FDR混合料设计通常会指定固定比率的稳定剂，由于现有路面固有的可变性，这可能会产生一定范围的FDR强度。为了获得最佳的长期路面性能，应使稳定基层的刚度变化最小。这项研究调查了FDR基础层刚度变化对路面性能的影响。在佐治亚州的一个路面重建项目上进行了一系列的现场和实验室测试，以评估变异性。测试包括无侧限抗压强度（UCS）测试和轻型挠度计（LWD）和落体重量挠度计（FWD）的挠度测试。根据现场和实验室测试结果进行了机械敏感性分析，以研究FDR性能变化对路面性能的影响。结果表明，FDR基层厚度和强度均对预测的路面响应有重要影响。涉及FDR路面设计和性能建模的路面工程师将对这里介绍的发现感兴趣。