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Q: Consider the following statements regarding, the function of base course and sub-base course in pavement layers. I. Prevent mud-pumping in rigid pavement II. Protect sub-grade of rigid pavement from frost action III. Provide tensile strength to the flexible pavement IV. Prevent warping stresses in rigid pavement. Which of the above statements are correct?
  • A. Both (ii) and (iv)
  • B. Only (i), (ii) and (iv)
  • C. Only (ii), (iii) and (v)
  • D. Only (i), (ii) and (v)
Correct Answer: Option B - Property of various layers provided in pavements– (i) Base course–Under the rigid pavement, the base course is used to– • provide uniform and stable support • minimize damaging effects of frost action, provide drainage • Prevent pumping of fine grained soil at joints • Increase structural capacity. (ii) Sub-base course–Sub-base course provided beneath the base course in flexible pavements. • Its primary function to provided to structural support and distribute the load in flexible prevent.
B. Property of various layers provided in pavements– (i) Base course–Under the rigid pavement, the base course is used to– • provide uniform and stable support • minimize damaging effects of frost action, provide drainage • Prevent pumping of fine grained soil at joints • Increase structural capacity. (ii) Sub-base course–Sub-base course provided beneath the base course in flexible pavements. • Its primary function to provided to structural support and distribute the load in flexible prevent.

Explanations:

Property of various layers provided in pavements– (i) Base course–Under the rigid pavement, the base course is used to– • provide uniform and stable support • minimize damaging effects of frost action, provide drainage • Prevent pumping of fine grained soil at joints • Increase structural capacity. (ii) Sub-base course–Sub-base course provided beneath the base course in flexible pavements. • Its primary function to provided to structural support and distribute the load in flexible prevent.