# Highway Maintenance

 Question 1
As per IRC:37-2012, in order to control subgrade rutting in flexible pavements, the parameter to be considered is
 A horizontal tensile strain at the bottom of bituminous layer B vertical compressive strain on top of subgrade C vertical compressive stress on top of granular layer D vertical deflection at the surface of the pavement
GATE CE 2018 SET-2   Transportation Engineering
Question 1 Explanation:
As per $\mathrm{IRC}: 37-2012$
$N=4.1656 \times 10^{-0.08}\left[\frac{1}{\epsilon_{V}}\right]^{4.5337}$

$N=1.41 \times 10^{-8}\left[\frac{1}{\epsilon_{v}}\right]^{4.5337}$
where N= No. of cumulative standard axle
$\epsilon_{v}=$ Vertical strain in the subgrade
 Question 2