1. Whether the tandem vibratory roller is going uphill or downhill, the bottom layer of the asphalt mixture must be clean and dry, and a layer of asphalt binder must be sprayed to prevent the mixture from slipping off during rolling.
2. Whether it is uphill or an old downhill building shell, the drive wheel of the tandem vibratory roller should be behind. The advantage of this is that when driving uphill, the rear drive wheels can take the drive provided by the incline and the machine itself, while the front wheels can pre-compact the road surface to withstand the high shear forces created by the drive wheels. When the application is downhill, the impact force created by the weight of the twin drum vibratory roller is counteracted by the braking of the drive wheels. Only the mixture after the front wheel rolls can support the drive wheels to generate shearing forces.
3. When going uphill, the tandem vibratory roller should start, stop and accelerate smoothly to avoid the speed being too high or too low.
4. Before going uphill, the mixture should be cooled to the specified low temperature and then statically preloaded. When the temperature of the mixture drops to the lower limit (120°C), use vibratory compaction.
5. Avoid sudden shifting and braking when going downhill.
6. For downhill crushing in steep slope conditions, a light roller should be used for pre-compression and then a heavy roller or vibratory roller should be used for compaction.
