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Q: Lean concrete base is an example for ...........
  • A. Composite pavement
  • B. Semi-rigid pavement
  • C. Flexible pavement
  • D. Rigid pavement
Correct Answer: Option B - Semi-rigid pavements:- When bonded materials like the pozzolanic concrete (lime-flyash-aggregate mix), lean cement concrete or soil-cement are used in the base course or sub-base course layer the pavement layer has considerably higher flexural strength than the common flexible pavement layers. However these bonded materials do not possess as much flexural strength as the cement concrete pavements. Therefore when this intermediate class of materials are used in the base or sub-base course layer of the pavements, they are called semi-rigid pavements.
B. Semi-rigid pavements:- When bonded materials like the pozzolanic concrete (lime-flyash-aggregate mix), lean cement concrete or soil-cement are used in the base course or sub-base course layer the pavement layer has considerably higher flexural strength than the common flexible pavement layers. However these bonded materials do not possess as much flexural strength as the cement concrete pavements. Therefore when this intermediate class of materials are used in the base or sub-base course layer of the pavements, they are called semi-rigid pavements.

Explanations:

Semi-rigid pavements:- When bonded materials like the pozzolanic concrete (lime-flyash-aggregate mix), lean cement concrete or soil-cement are used in the base course or sub-base course layer the pavement layer has considerably higher flexural strength than the common flexible pavement layers. However these bonded materials do not possess as much flexural strength as the cement concrete pavements. Therefore when this intermediate class of materials are used in the base or sub-base course layer of the pavements, they are called semi-rigid pavements.