Question $2\mathrm{.}0$

It is observed that there is need for a new road in a medium density area which services a

small town and residential stands. As a transport engineer you are required to:

Design a geotextile reinforced flexible pavement for a new road with AASHTO $1993$

standard guide lines

$-$Design period $15$ years

$-$loading Actual $($including overloaded trucks$)$

$-$design subgrade CBR of $2\mathrm{.}97$ percent

$-$Geotextile Reinforced

$-$Base CBR $98\%$

Sub base CBR $30\%$

$-$Growth rate $2\%$

use the design EASL$($W$18)$ For a new road according to AASHTO $1993$ show the table

Use the nomorgraph to solve for structural numbers, In your calculation determine base

course reduction factor and the traffic benefit ratio.

Determine the thickness with and without geotextile and evaluate the benefits of adding a

geotextile to a low CBR soil. Show all working including formulaes. $(50)$