Introduction to Pavement Design

Question 1

Why do we need Roads or Pavements

Answer 1

Safety
Skid Resistance
Dust free surface
Comfort
Drainage
Support
Distributes wheel Load
Cost
reduces operation cost

Question 2

Types of Pavements

Answer 2

Flexible Pavements
Rigid Pavements

Question 3

Pavement Materials

Answer 3

Unbound granular material
Modified granular material
Cemented Material
Asphalt
Concrete

Question 4

Unbound granular materials are

Answer 4

Gravels or crushed rock
No significant tensile strength
Strength properties can be moisture sensitive

Question 5

Modified Granular Material are:

Answer 5

Small amount of stabilising agent
Improves stiffness and other soil properties
Does not increase tensile capacity significantly
Difficult to make sure no bonding occurs

Question 6

Cemented Material

Answer 6

Binding agent + water + granular materials
Significant tensile strength

Question 7

Asphalt materials are:

Answer 7

Bituminous binder + several single sized aggregate fractions
Spread and compacted while hot
Strength Depends on
friction between aggregate
viscosity of the binder under operating condition
adhesion between binder and aggregate

Question 8

Concrete material are:

Answer 8

Cement + fine aggregate + coarse aggregate