Comprehensive Analytical Study of Structural Reclamation in Aging Flexible Pavement 3 Abdelbaset M. Traplsi , 2 *, Abdalla Ali Agwila 1 Mohamed Ali karim 1 Academy for Postgraduate Studies, 2 Alasmarya Islamic University, 3 Elmergib University *Corresponding author email: omgaon2x@yahoo.com Abstract The progressive deterioration of flexible pavements, driven by increasing traffic loads, environmental influences, and material aging, necessitates the implementation of effective structural reclamation strategies to restore functional performance and extend service life. This study focuses on a critical segment of the Libyan coastal road network, specifically the 27.5 km part from Tripoli Street Bridge to Al-Krarim Gate. An analytical and quantitative investigation is undertaken to evaluate the structural condition and rehabilitation potential of the existing flexible pavement system, with particular attention to distress mechanisms, material degradation, and the effectiveness of various rehabilitation techniques. The assessment integrates field investigations, laboratory testing, and standard procedures outlined by AASHTO (AASHTO, 1993) to evaluate pavement distress, base soil strength, and asphalt concrete layers performance. Pavement Condition Index (PCI) values and core sample analyses are employed to determine the extent of structural failure. Visual distress surveys supplement the data to provide a comprehensive understanding of surface and sub-surface conditions. Analytical modeling, based on layered elastic theory is used to simulate pavement response under rehabilitated conditions and forecast long-term performance under loading. The study examines several rehabilitation methods, including full- depth reclamation (FDR), cold in-place recycling (CIR), and mechanical stabilization using cementitious additives. Each method is evaluated based on structural capacity enhancement, cost- efficiency, and service life extension. Results demonstrate that the selection of reclamation techniques tailored to subgrade conditions and traffic loads significantly improves structural performance and minimizes maintenance needs. The study concludes that full-depth repaving offers the most sustainable and economically viable solution for restoring the targeted roadway section. Keywords: Flexible pavement, Structural reclamation, Pavement rehabilitation, Full-depth reclamation (FDR), Cold in-place recycling (CIR). 1. Introduction Transportation infrastructure forms the backbone of national development by facilitating trade, social interaction, and economic activities [1]. Among various infrastructure components, road networks are particularly vital, acting as arteries that connect cities, industries, ports, and residential areas. Flexible pavements, characterized by their ability to withstand loads through layered elastic behavior, are the predominant pavement type in many countries due to their cost- efficiency and relative ease of construction and maintenance. However, these pavements are highly susceptible to performance deterioration over time, driven by environmental exposure, increasing traffic volumes, especially heavy axle loads, material aging, and insufficient maintenance. As the lifecycle of flexible pavements progresses, the need for comprehensive evaluation and timely intervention becomes critical to avoid catastrophic failure and economic loss.