Civil Engineering MCQAE Level Civil Engineering
Rutting in flexible pavements is a permanent deformation primarily caused by:
Transportation EngineeringPavement Failure ModesMEDIUM
Choose the correct answer
A
Fatigue cracking of bituminous layers
B
Plastic deformation of subgrade or bituminous layers under repeated heavy axle loads in hot weather
C
Reflection cracking from base layer
D
Frost heave
Correct Answer
B. Plastic deformation of subgrade or bituminous layers under repeated heavy axle loads in hot weather
Why is this the answer?
Rutting = longitudinal groove in wheel path due to accumulation of plastic deformation in any/all pavement layers (mainly bituminous mix and subgrade). Causes: overloading, high temperature (soft bitumen), insufficient pavement thickness, poor mix design.
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