(a) Draw a neat sketch of a rigid pavement cross-section and show its…

Question

(a) Draw a neat sketch of a rigid pavement cross-section and show its different component parts. Explain the function of sub-base course and base course in detail. [10]

(b) The plate bearing tests were conducted with $30\text{ cm}$ dia plate on soil sub-grade and over $15\text{ cm}$ base course. The pressure yielded at $0.25\text{ cm}$ deflection is $1.25\text{ kg/cm}^2$ and $5\text{ kg/cm}^2$. Design the pavement thickness for $4080\text{ kgs}$ wheel load with tyre pressure of $4.5\text{ kg/cm}^2$, Rigidity factor = 1.11. [10]