(a) Explain the CBR method of pavement design. How is this method use…

Question

(a) Explain the CBR method of pavement design. How is this method useful to determine the thickness of component layers ?

(b) Calculate the stresses at the interior edge and corner region of a cement concrete pavement by Westergaads analysis using the following data :

Wheel load $= 4000\text{ kg}$, Pavement thickness $= 15\text{ cm}$

Poisson ratio of concrete $= 0.15$, Radius of contact area $= 15\text{ cm}$

Modulus of elasticity of concrete $= 0.3\text{ million kg/cm}^2$

Modulus of subgrade reaction $= 3.0\text{ kg/cm}^2$