Helical or diagonal cracks

Helical or diagonal cracks are caused by instability or settlement of the embankment. 

The maintenance of these cracks is carried out by crack sealing or by milling out a narrow zone to a certain depth and then filling it with hot asphalt. 

After a crack emerges, an investigation aimed at determining the actual causes of embankment failure is recommended to establish proper and permanent treatment. 

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Figure IS. 10 Helical or diagonal cracks, (a) Helical crack, after treatment (b) Helical crack formation and (c) diagonal crack.

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