Before starting the asphalt concrete paving process, the construction team must carefully select the type and number of road rollers based on site conditions and project progress. Proper compaction is crucial for ensuring the quality of the asphalt base and the smoothness of the finished surface. The compaction process typically involves three stages: initial compaction, recompaction, and final compaction, each requiring different compactor settings and techniques. Therefore, choosing the right combination of rollers and following an appropriate rolling sequence is essential.
After the asphalt is laid, the optimal roller combination usually includes a steel drum static roller, a tire roller, and a vibratory roller. The number of rollers required depends on the daily production volume and the complexity of the site. However, for sports field and track construction, at least two rollers are always necessary, regardless of the amount of asphalt being paved. In such cases, the compaction work must be carried out using a combination of a light roller, a heavy-duty roller, and a small roller to ensure even density and proper consolidation.
Sports venues often have complex layouts with tight corners and irregular surfaces, which may require the use of manual compaction tools like hand-held vibratory machines to meet quality standards. These machines should weigh at least 180 kg and operate at a vibration frequency of no less than 3,000 cycles per minute.
When selecting the weight of the rollers, the following guidelines can be used as a reference:
- Two-wheel steel drum roller: 6–8 tons
- Three-wheel steel drum roller: 8–12 tons
- Tyre roller: 12–20 tons
- Steel drum vibratory roller: 2–6 tons
- Walk-behind small vibratory roller: 1–2 tons
- Hand-held vibratory machine: weight not less than 180 kg, vibration frequency not less than 3,000 times per minute
Choosing the right equipment ensures that the pavement meets durability and safety standards, especially in high-traffic or specialized areas like sports facilities. It's also important to train operators properly and maintain the machinery regularly to avoid delays and ensure consistent results throughout the project.
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