Statement 1: True The pavement performance is largely defined by evaluation in the following categories: Roughness Surface distress Skid resistance Structural evaluation – Deflection. Among above parameters, Pavement Roughness can be measured by Present Serviceability Rating (as suggested by AASHTO on a scale of 0-5). Statement 2: False Rigid pavements are more affected by temperature variations than flexible pavements because flexible pavement yields some elasticity or flexibility against the temperature stresses. Note: The difference between rigid and flexible pavement is given by:
Flexible pavement
Rigid Pavement
Load is transferred from top to bottom by grain to grain contact.
Load is transferred through slab action
Low or negligible flexural strength.
High flexural strength.
Joints are absent.
Expansion and contraction joints are provided.
Low initial cot but high maintenance cost.
High Initial cost but low maintenance cost.
It includes- Surface, base, sub-base and sub grade layers.
It includes – Concrete slab, base course and subgrade layers.
Deformation in the top layers is transferred to under- laid layers
Deformation is only in the top layer of the concrete slab.