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Q: Which of the following is the function of the sub base layer in the pavement?
  • A. To provide skid resistance surface
  • B. To minimize the damging effect of frost action
  • C. To provide a smooth and uniform surface for riding
  • D. To resist the abrasive forces of traffic
Correct Answer: Option B - The AASHTO Guide for design of pavement structures (AASHTO 1993 : I–21) defines a sub-base as "one or more compacted layers of granular or stabilized material" between the subgrade and concrete pavement slab. The function of the sub-base layer in the pavement– • To minimize the damaging effects of frost action. • To provide uniform, stable and permanent support. • To increase the modulus of subgrade reaction • To prevent pumping of fine-grained soils at joints, cracks and edges of the rigid slab. • To provide a working platform for construction equipment.
B. The AASHTO Guide for design of pavement structures (AASHTO 1993 : I–21) defines a sub-base as "one or more compacted layers of granular or stabilized material" between the subgrade and concrete pavement slab. The function of the sub-base layer in the pavement– • To minimize the damaging effects of frost action. • To provide uniform, stable and permanent support. • To increase the modulus of subgrade reaction • To prevent pumping of fine-grained soils at joints, cracks and edges of the rigid slab. • To provide a working platform for construction equipment.

Explanations:

The AASHTO Guide for design of pavement structures (AASHTO 1993 : I–21) defines a sub-base as "one or more compacted layers of granular or stabilized material" between the subgrade and concrete pavement slab. The function of the sub-base layer in the pavement– • To minimize the damaging effects of frost action. • To provide uniform, stable and permanent support. • To increase the modulus of subgrade reaction • To prevent pumping of fine-grained soils at joints, cracks and edges of the rigid slab. • To provide a working platform for construction equipment.