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# Tests ## Question 43: Radius of relative stiffness of cement concrete pavement is *not* dependent upon: - Modulus of subgrade reaction - Poisson's ratio of concrete - Wheel load - Modulus of elasticity of cement concrete ## Solution: ### Concept: As per Westergaard, radius of relative stiffness...

# Tests ## Question 43: Radius of relative stiffness of cement concrete pavement is *not* dependent upon: - Modulus of subgrade reaction - Poisson's ratio of concrete - Wheel load - Modulus of elasticity of cement concrete ## Solution: ### Concept: As per Westergaard, radius of relative stiffness ($l$) is: ``` $l = [\frac{Eh^3}{12k(1-\mu^2)}]^{1/4}$ ``` where: - $E$ = Modulus of elasticity of cement concrete, kg/cm2 - $\mu$ = Poisson's ratio for concrete - $h$ = Slab thickness, cm - $k$ = Subgrade modulus or modulus of subgrade reaction, kg/cm3 **Therefore, the radius of relative stiffness of cement concrete pavement is not dependent upon the wheel load.**