Activity $5$

Estimate the required materials for the given cross section of flexible road with one kilometre length

and $3\mathrm{.}5$ metre width at the surface base and base layers. The road has $15cm,20cm,$ and $25cm$

thicknesses for surface layer, base layer, and subbase layer, respectively, as shown in Figure. Assume

$30\%$ extra material in each layer for fully compaction.

$($Hint: the subgrade construction includes site clearance only in this project. There is no embankment.

at this stage.$)$