According to the difference of road width, wheel width and track width of the roller, the cold recycling machine leasing shall formulate the rolling scheme, which shall make the rolling times of each part as the same as possible, and the two sides of the road surface shall be rolled for 2-3 times more. After the regenerator, a large-tonnage single-drum vibratory roller shall be equipped for initial compaction.
During initial compaction, let the roller follow the back of the regenerator for one time of static compaction, and then use strong vibration (high amplitude and low frequency) for compaction. The number of compaction times should be sufficient to ensure that the compactness within the range of 2/3 thickness of the bottom of the regenerator layer meets the specified requirements (more than 5 times of compaction). Each rolling shall start from the starting point of the construction section to the edge of the recycling machine, and the rolling width shall exceed the width of the recycling machine.
The working speed of the roller shall not exceed 3km/h. After completing the regeneration and initial compaction of a working section, it shall be reshaped immediately with a grader. In the straight section, the grader scrapes from both sides to the center of the road; In the flat curve section, the grader scrapes from the inside to the outside. If necessary, go back and scrape again. Before shaping, if the moisture loss on the surface of the recycled material is serious, it can be watered first and then reshaped with a grader.
During the shaping process, no vehicles are allowed to pass and there is no obvious segregation of coarse and fine aggregates. After shaping, the double-drum vibratory roller shall be used immediately for re-pressing with weak vibration (low amplitude and high frequency). For straight line and flat curve sections without superelevation, when rolling from the shoulder to the center of the road, 1/2 wheel width shall be overlapped each time, and it is one time after rolling the full width of the road. Generally, it needs to be rolled for 4-6 times.
The rolling speed of the roller should be 1.5~1.7km/h for the first two passes, and 2.0~2.5km/h for the next two passes. After that, the rubber wheel roller shall be used for final compaction (rolling for more than 4 times), and water can be sprayed for rolling if necessary.
After mixing and shaping, the cement stabilized recycled layer should be rolled before the initial setting of the cement and within the delay time determined by the test to achieve the required compactness without obvious wheel marks. After rolling, the cold recycled base shall be tested in time. The main items include pavement flatness, thickness, width, cross slope, compactness, etc. Come to our website for more relevant content https://www.sddhfjx.com Ask!