Block Cracking
Block Cracking is a series of interconnecting cracks that form in a roughly rectangular pattern. It can occur in both concrete and flexible road pavements.
Causes
In concrete pavements block cracking may occur as a result of insufficient slab thickness, loss of sub-base support or subgrade settlement.
In bituminous surfaces block cracking may be caused by the reflection of cracks in an underlying concrete pavement, asphalt shrinkage due to diurnal temperature variations or fatigue cracking in an embrittled asphalt wearing course.