Week 10

Arrange the different layers of flexible pavement from the subgrade:

• Base Subbase <Subgrade < Surface

• Subgrade <Subbase Base < Surface

• Subbase Subgrade Surface < Base

• Subgrade Base < Subbase Base

Choose the correct statements related to asphalt from the following options:

• Asphalts are long-chain hydrocarbons and are visco-elastic in nature

• Asphalts are aromatic in nature

• Asphalts are obtained from the destructive distillation of coal

• The viscosity of the asphalt decreases with increase in temperature

State true or false:

Bitumen is obtained by destructive distillation of bituminous cement:

• True

• False

Which one of the following is not a mode of failure for asphalt pavements?

• Rutting

• Thermal cracking

• Raveling and stripping

• Curling

Match the following additives with the corresponding polymer properties:

• A-ii, B-1, C-iii

• A-ii, Biii, C-i

• Ai, Biii, C-ii

• A-i, B-ii, C-ii

Select the appropriate options regarding the rigid pavements from the following.

• A drainage course is not required in rigid pavement because of less permeability

• Reinforced concrete pavement doesn't require expansion joints

• The suitability of concrete is decided on compressive strength but not on tensile strength

• Fiber reinforcement reduces the thickness requirement of rigid pavement

Dowels are used to

• Restrict the longitudinal movement

• To transfer load between individual slabs

• Provide strength to rigid pavement

Surface texturing is required to

• Increase splash during the rainy season

• Provide good grip with tyers

• Help in reducing noise

• Provide drainage path

Choose the instrument that helps simulate actual asphalt pavement compaction conditions

in the laboratory from the following:

• Ball mill

• Gyratory compactor

• Sheepfoot rollers

• Rammer compactor

State true or false:

In flexible pavements, the load intensity decreases along the pavement's depth.

• True

• False