A road with estimated 15 million ESAL for both directions after 20 years will be constructed on a subgrade. The CBR of the subgrade was obtained at 24% with standard deviation of 5% (85% probability). Determine the subgrade class and combined thickness of the wearing and binder courses with stabilized base using ATJ5/85 (2013).

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Design of pavements

Pavement is a structure that is made up of different layers such as sub-base course layer, base course layer, binder course, and a surface course formed with different materials such as gravel, above the subgrade soil constructed to act as a path or carriageway enabling the movement of vehicles. The surface of the pavement should possess characteristics such as adequate friction, light reflection, and drainage. The pavements are classified based on structural design into rigid pavements, flexible pavements, composite pavements, and unpaved pavements. The process of determining a suitable pavement type, its constituent layers, and its thickness is called pavement design.