How XCMG Small Road Roller Compact Dirt Roads

1. Initial pressure
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The first 1-2 times of rolling operations on the pavement layer are called initial pressing. The purpose of the initial pressure is to form a relatively stable and smooth bearing layer on the surface of the pavement, so as to withstand a large compaction force during re-compression.
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The initial compaction of the subgrade can generally be carried out by heavy-duty crawler tractors and sheep foot (bump) rollers, or by medium-sized road rollers for static compaction, and the rolling speed should not exceed 1.5-2km/h. After the initial pressure, the paving layer shall be leveled with a grader.
2. Repressurization
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Recompression is a continuous compaction operation based on the initial pressure. Recompression is usually rolled 5 to 8 times, the purpose of which is to make the pavement layer reach the specified degree of compaction. Re-compacting is the main compaction stage. During the re-compacting operation, the compaction function of the road roller should be exerted as much as possible so that the laminated layer can quickly reach the specified degree of compaction. Increasing the counterweight of the roller or adjusting the air pressure of the tire-type roller to make the unit line load and average ground specific pressure reach the state, and adjusting the vibration frequency and amplitude of the vibratory roller can give full play to the compaction function of the roller and improve the compaction effect.
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The rolling speed of the re-compacting operation should be gradually increased to maximize the operating efficiency under the premise of ensuring the compaction quality. When re-compacting, the degree of compaction should be measured at any time, so as to meet the specified compaction standards without excessive rolling.
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3. Final pressure
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The 1-2 times of rolling operation on the pavement layer before completion is called final pressure. When building the subgrade in layers, the final pressure operation is only carried out on one layer. The purpose of the final compaction is to make the surface of the compacted layer meet the requirements of smoothness. Therefore, it is suitable to use a medium-sized static compactor or vibratory roller to carry out the compaction in a static compaction method, and the compaction speed can be appropriately higher than the recompression speed.
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If a vibratory roller or a sheep foot (bump) roller roller is used for layer compaction, due to the looseness of the surface layer, the thickness of each layer surface of about 10cm can be used as the range of the next pavement layer for compaction, so that Make the adjacent laminates more tightly bonded.