Road Foundation

1.Preperation

- Survey to determine

* line of road

* Amount of excavation and refilling likely to be needed

* Amount of surfacing material

* Quality of soil



2. Factors to take into account

Soil should be permeable for good drainage and easily compacted to good bearing capacity otherwise the road surface will not be durable



3. Process

Site should be excavated unsuitable soil should be replaced various machine are available. It depends on the depth of the cut and how much space there is at the site.
Final compacting is done with a roller. This complets the sub-grade
Then sub-base layer is added should also consist of material that drains easily
This layer must be compacted carefully so that its density is uniform all over it
The layer must be sealed