$4.$ List the tests performed on subgrade soil, aggregates, and bitumen to indicate their permissible

limit as per MoRTH specifications and classify various types of geosynthetics.

Calculate the rebound surface deflection on a single$-$layer pavement under a wheel lead of $50kN$

b with a typical pressure of $0\mathrm{.}75$Mpa. The effective elastic modulus of subgrade may be taken as $45$ MPa and the Poisson ratio of the soil as $0\mathrm{.}5$

Explain the importance and need of pavement maintenance and indicate various pavement faintness methods with neat sketches. Explain the ESWL concept with a neat sketch.