It is caused by lack of support of the road edge, sometimes due to poorly drained or weak shoulders. This can cause fatigue cracking to develop rapidly, as overloading will happen with loads of less magnitude or frequency.Įdge cracking is the formation of crescent-shaped cracks near the edge of a road. If left uncorrected, this reduces the thickness of the pavement, reducing the affected portion's ability to carry its designed loading. Stripping occurs when poor adhesion between asphalt and aggregate allows the aggregate at the surface to dislodge. Stripping or raveling is another possible cause of fatigue cracking. A heavy spring thaw, similarly to poor drainage, can weaken the base course, leading to fatigue cracking. Poor drainage in the road bed is a frequent cause of this degradation of the base or subgrade. There are many ways that the subbase or base can be weakened. Frequently, overloading happens because the base or subbase inadequately support the surface layer and subsequently cannot handle loads that it would normally endure. However, fatigue cracking can be greatly influenced by environmental and other effects while traffic loading remains the direct cause. Fatigue cracking is an asphalt pavement distress most often instigated by failure of the surface due to traffic loading.
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