Question

Which one of the following defects indicated progressive disintegrations of bituminous premix carpet surfacing by loss of aggregates?

1. pot holes
2. Ravelling
3. edge breaking
4. rutting
5.

Answer 1

Correct Answer - Option 1 : pot holes

Explanation:

Types of a defect in the flexible pavement:

• Surface defect
• Crack
• Deformation
• Disintegration

Types of distress	Symptoms
A) Surface defect
Fatty surface	Collection binder on the surface
Smooth surface	Slippery
Streaking	Presence of alternate lean and heavy lines of bitumen
Hungry surface	Loss of aggregate or presence of fine cracks
B) Cracks
Hairline crack	Short and fine cracks at close intervals on the surface
Alligator cracking	Interconnected cracks forming a series of small block
Longitudinal crack	Crack on a straight line along the road
Edge crack	Cracks near and parallel to pavement edges
Shrinkage crack	Cracks in transverse direction or inter-connected cracks forming a series of large blocks
Reflection crack	Sympathetic crack over joints and cracks in the pavement underneath
C) Deformation
Slippage	Formation of crescent-shaped cracks pointing in the direction of the thrust of wheels.
Rutting	Longitudinal depression in the wheel crack
Corrugations	Formation of regular undulations
Shoving	Localized bulging of pavement surface along with crescent-shaped crack
Shallow depression	Localized shallow depression
Settlement and upheaval	Large deformation of pavement
D) Disintegration
Stripping	Separation of bitumen from aggregates in the presence of moisture
Loss of aggregates	Rough surface with loss of aggregates in some portions
Raveling	Failure of binder to hold the aggregates shown up by pockmarks of eroded areas on the surface
Pothole	The appearance of bowl-shaped holes, usually after rain. This indicated progressive disintegrations of bituminous premix carpet surfacing by loss of aggregates.
Edge breaking	Irregular breakage of pavement edges.