A single-drum roller is mainly used for compacting the lower structural layers of a road. The specific parts include:

• Subgrade:The original ground, filled subgrade soil, sand & gravel subgrade, and other deep compaction work.

• Sub-base:Graded crushed stone, natural sand & gravel, and other sub-base materials.

• Base course:Cement-stabilized crushed stone, lime soil, cement-stabilized layers, and other semi-rigid base courses.

• Road slopes and shoulders:Backfill compaction for slopes on both sides of the subgrade and road shoulders.

• Trenches and foundation pits:Earth backfill compaction for road pipeline trenches, foundation pits, etc.

One-sentence summary:Single-drum rollers are mainly used for compacting the subgrade and base courses, and are not suitable for asphalt surface courses.