GATE Questions & Answers of Design of rigid pavements using IRC: 58-2011

What is the Weightage of Design of rigid pavements using IRC: 58-2011 in GATE Exam?

Total 2 Questions have been asked from Design of rigid pavements using IRC: 58-2011 topic of Highway Pavements subject in previous GATE papers. Average marks 1.50.

The radii of relative stiffness of the rigid pavements P and Q are denoted by lP and lQ  , respectively. The geometric and material properties of the concrete slab and underlying soil are given below:

Pavement Concrete Soil

Length of
Slab

Breadth
of Slab

Thickness
of Slab

Modulus of
Elasticity

Poisson's
Ratio

Subgrade
Reaction
Moduls

P L B h E $\style{font-family:'Times New Roman'}\mu$ K
Q L B 0.5h E $\style{font-family:'Times New Roman'}\mu$ 2K

The ratio (up to one decimal place) of lP, /lQ  is ________________

In the context of the IRC 58-2011 guidelines for rigid pavement design, consider the following pair of statements.

I: Radius of relative stiffness is directly related to modulus of elasticity of concrete and inversely related to Poisson's ratio

II: Radius of relative stiffness is directly related to thickness of slab and modulus of subgrade reaction.

Which one of the following combinations is correct?