Highway Pavement Cross-Section Super Highway Upgrade
This cutaway illustrates a reinforced flexible pavement structure under construction. The top layers are hot-mix asphalt: a thin wearing course for ride quality and skid resistance, over a thicker binder course that distributes loads. Below sits a crushed-stone base course, reinforced by a geogrid layer that improves tensile strength and reduces rutting. A granular sub-base follows, separated by a geotextile that acts as a separator and filter. The foundation consists of a stabilized subgrade and a compacted natural subgrade, providing overall support and drainage. Construction equipment (paver and rollers) is placing and compacting the asphalt layers.
Questions
1. What is the primary function of the asphalt wearing course versus the binder course?
2. Why is a geogrid placed between the base course and sub-base in this design?
3. What dual role does the geotextile reinforcement layer serve?
4. List the layers from top to bottom and identify which ones are unbound granular materials.
5. How does proper compaction of the subgrade influence the performance of the upper layers?
6. What type of pavement system is shown (flexible or rigid), and what evidence supports your answer?
7. During construction, which layers are typically placed and compacted first?
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