Abstract:

General Background: Flexible road structures require thickness configurations that can withstand cumulative traffic loading while accommodating subgrade strength and local environmental conditions. Specific Background: A 200 m severely damaged segment of the 3.2 km Krian–Wonoayu alternative road requires structural rehabilitation to restore serviceability and support connectivity between Krian and Wonoayu Districts. Knowledge Gap: A pavement configuration based on the 2024 Indonesian Pavement Design Manual had not been established for the segment using measured traffic, road geometry, and local soil-bearing data. Aims: This study determines the required flexible pavement layers for a 20-year design life using the Bina Marga MDPJ 2024 method. Results: Primary data were obtained through field observation, geometric measurement, and a seven-day traffic survey, while the soil California Bearing Ratio was obtained from village government records. Average daily traffic reached 683 vehicles. The design CBR was 4.34%, the CESA4 value was 137,901, and application of a 1.9 traffic multiplier produced a CESAL value of 262,012. The selected structure consists of 200 mm subgrade improvement, 150 mm Class B aggregate foundation, 150 mm Class A aggregate foundation, and 50 mm HRS-WC, without an HRS-Base layer. Novelty: The study applies the latest national standard to a damaged local alternative corridor by integrating observed traffic loading and site-specific subgrade capacity. Implications: The proposed configuration provides a technical basis for rehabilitating the affected segment and supporting adequate structural durability throughout the planned service period.

Highlights:

• Average daily traffic reached 683 vehicles, producing CESAL of 262,012.


• Subgrade capacity was 4.34%, requiring 200 mm ground improvement.


• The structural layers comprise 150 mm Class B and 150 mm Class A aggregates.

Keywords: Flexible Pavement, MDPJ 2024, Traffic Loading, California Bearing Ratio, Road Rehabilitation