What is a typical layer sequence for constructing flexible pavement?

In the construction of flexible pavement, the correct layer sequence typically involves starting with the subgrade at the bottom, which is the natural ground or prepared soil that provides support for the entire pavement structure. Above the subgrade is the subbase, which consists of granular materials that help in distributing loads and improving drainage. The base course follows, providing additional load-bearing support and contributing to the overall stability of the pavement. Finally, the surface course is placed on top, consisting of materials designed to withstand traffic wear and provide a smooth driving surface.

This sequence is crucial because each layer serves a specific purpose that supports the layers above it, ultimately contributing to the pavement’s performance, durability, and longevity.