What are the prevention and control measures for asphalt concrete pavement joint diseases?

The preventive measures for asphalt concrete pavement joint disease are as follows:

1. Transverse seams:1.Try to use flat seams.

The end edge of the paved pavement is sawn vertically when it is cooled but not yet hardened, and at right angles to the longitudinal edge, or the part of the end layer that is not thick can be removed vertically with a rock drill or manually while it is not cooling. When using miter seams, pay attention to the lap length, generally.

2.Preheating softens part of the compacted pavement and strengthens the bond between the old and new mixtures.

3.The starting speed of the paver should be slow, and the reserved height should be adjusted, and the paving should be rolled immediately after the paving, and the roller should first carry out transverse rolling (gradually move to the new pavement layer from the span joint on the paved road surface first), and then longitudinally roll into a whole, and the rolling speed should not be too fast.

Second, longitudinal seams:1.Try to use hot stubble construction, and use two or more pavers to operate in echelons.

2.The paved mixture is left 10 20cm not rolled for the time being, as the elevation datum of the post-paving part, and is rolled together after the completion of the post-paving part. If the longitudinal seam is a hot seam, it should be rolled across the seam with a width of 1 2 wheels; If the longitudinal joint is a cold joint, it should first walk on the compacted road, only press 10 15cm of the new layer, and then move the compaction wheel to the new pavement 10 15cm each time.

3.After the rolling is completed, it is inspected with a 3m ruler and the edges and corners are treated with a drum roller.

First, and at right angles with the longitudinal edge, after the completion of the paving part together rolling, the rolling speed should not be too fast.

Second, the longitudinal seams, and then longitudinal rolling into one. Try to use flat joints, should first walk on the compacted road, only press the 10 15cm of the new pavement, and then move the compaction wheel to the new pavement 10 15cm each time, pay attention to the lap length, generally 0. The edge of the paved road surface is sawn vertically when it is cooled but not yet hardened.

Leave 10 20cm of paved mixture for the time being. The paver should start slowly.

Preheat to soften the compacted part of the pavement to strengthen the bond between the old and new mixtures, or to remove the part of the end layer that is not thick enough with a rock drill or manual while it is not cooling. When using miter seams. 4～0：

Try to use hot stubble construction, use two or more pavers to operate in echelons, and adjust the reserved height, roll immediately after paving, and the roller first carry out transverse rolling (from the first paved road surface to the new pavement layer).

3. As the elevation datum of the rear paving part, the asphalt concrete pavement joint disease prevention measures are as follows.

3.After the rolling is completed, it is inspected with a 3m ruler and the edges and corners are treated with a drum roller. If the longitudinal seam is a hot seam, it should be rolled across the seam with a width of 1 2 wheels; If the longitudinal seam is a cold seam, the transverse seam:

Answer: B

This question examines the prevention and control of asphalt pavement joints. Option B is a preventive measure for the disease of transverse joints of asphalt concrete with bent oak.

Answer]: A The defects that are often easily produced by poor seam treatment are concave or convex seams, as well as cracks or even looseness due to insufficient seam compaction and insufficient bonding strength.