Rollers can be categorized by wheel type into single-drum, double-drum, and pneumatic tire rollers. They differ in compaction principle, suitable applications, and their respective advantages and disadvantages.

1. Single-Drum Roller

• Characteristics:

• Front wheel is a heavy steel drum (can be vibratory or static), rear wheel is tires or a steel drum for support.

• Compaction Method: Primarily relies on the drum's self-weight + vibration (optional) for deep compaction.

• Suitable Materials:

• Base materials like earth, sand, gravel (e.g., roadbeds, embankments).

• Not suitable for final compaction of asphalt surfaces (prone to leaving drum marks).

• Advantages:

• Large compaction depth (up to 30~50 cm), suitable for thick fill layers.

• Vibration mode enhances compaction effect and improves efficiency.

• Disadvantages:

• Steel drum can cause cracks on asphalt surfaces, not suitable for final surface compaction.

• Poorer steering maneuverability, not suitable for confined areas.

• Typical Applications: Highway subgrades, railway subgrades, hydraulic engineering - large-scale earthwork compaction.

2. Double-Drum Roller

• Characteristics:

• Both front and rear wheels are steel drums (usually vibratory), no tires.

• Compaction Method: High-frequency vibration + static pressure from the drums, suitable for asphalt layer compaction.

• Suitable Materials:

• Asphalt concrete (surface and base courses).

• Can also be used for thin-layer stabilized soil compaction.

• Advantages:

• Dual-drum vibration ensures even compaction without leaving tire marks.

• Suitable for initial, intermediate, and final compaction of asphalt pavements.

• Good maneuverability, adapts well to curve compaction.

• Disadvantages:

• Less effective for deep earthwork compaction compared to single-drum rollers.

• Steel drums may stick to hot asphalt during prolonged operation.

• Typical Applications: Municipal roads, highway asphalt surface course compaction.

3. Pneumatic Tire Roller (Rubber-Tired Roller)

• Characteristics:

• Uses multiple (typically 9~11) pneumatic rubber tires, no steel drums.

• Compaction Method: Static pressure + kneading action (elastic deformation of tires densifies the material).

• Suitable Materials:

• Final compaction of asphalt concrete surfaces (eliminates micro-cracks from vibratory rollers).

• Can also be used for flexible materials like clay, stabilized soil.

• Advantages:

• Kneading action produces a smoother, denser asphalt surface, improving pavement durability.

• Does not damage the asphalt surface, ideal for final compaction.

• Tire pressure can be adjusted to suit different material requirements.

• Disadvantages:

• Shallow compaction depth, not suitable for thick fill layers.

• Tires are prone to sticking to asphalt, requiring release agent spray.

• Typical Applications: Final compaction of asphalt pavements, airport runways, precision compaction on municipal roads.

Comparison Summary

How to Choose?

• Earthwork/Subgrade Compaction → Single-Drum Roller (use vibration for enhanced effect)

• Asphalt Initial/Intermediate Compaction → Double-Drum Roller (use vibration mode)

• Asphalt Final Compaction → Pneumatic Tire Roller (static pressure + kneading)

Using a combination of different rollers (e.g., double-drum + pneumatic tire) can achieve the optimal compaction result.