Question

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)

Answer 1

Answer: (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.