Definition of longitudinal crack

A single long longitudinal crack in a carriageway along the way. Generally, mature longitudinal cracks are long, reaching 20-50m. When the infiltration of road surface water into the foundation under the embankment is small, a longitudinal crack may only occur on the carriageway on both sides of the central divider, or even on the side close to the hard shoulder. When the infiltration of road surface water into the foundation under the embankment is large, There may be two longitudinal cracks in the carriageway on both sides of the central divider and in the overtaking lane, and a few sections may even have three longitudinal cracks. Clink this link for how to get high asphalt.

Longitudinal crack -- mild

Light: no or slightly scattered seam wall, no or few seams, seam width less than 5mm, calculated by length.

Longitudinal fracture -- severity

Heavy: the seam wall is scattered, the branch seam is more than 5mm wide, according to the length calculation.

The cause of longitudinal cracks

When the embankment edge is not sufficiently compacted, the embankment edge will produce settlement, resulting in longitudinal cracks at about 30cm from the roadside. In asphalt mixture paving, due to the improper treatment of longitudinal joints, the early water seepage or compaction of the road surface does not meet the requirements, and the longitudinal cracks will also be formed at the longitudinal joints under the action of driving. Due to the unavoidable inhomogeneity of the foundation and the fill in the transverse direction, especially in the case of infiltration of road surface water into the foundation, it is also inevitable that the asphalt pavement will produce fine and small longitudinal cracks. But too many longitudinal cracks, too large and too long crack width, will seriously affect the service performance and service life of asphalt pavement.

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