Question

Given that

r = radius of load distribution
E = modulus of elasticity of concrete
K = modulus of subgrade reaction
$\mu$ = Poisson's ratio of concrete
h = thickness of slab
P = wheel load

The combination of parameters required for obtaining the radius of relative stiffness of cement concrete slab is

• A. E, h, K, $\mu$
• B. h, K, $\mu$, r
• C. P, h, K, $\mu$
• D. E, K, $\mu$, r

Answer 1

The correct option is A E, h, K, $\mu$

Pressure deformation characteristics of rigid pavement are a function of relative stiffness of slab to that of subgrade. The term radius of relative stiffness was obtained by Westergaard. It is given by

$l={\left[\frac{E{h}^3}{12K(1-{\mu }^2)}\right]}^{1/4}$