Roads types and co
Roads types and construction techniques
The purpose of the road structure is to spread the loads imposed by a vehicle over a sufficiently wide area of the underlying soil, so that the applied stress is less than soils bearing capacity . If the underlying soil is a well – graded sand and gravel, this will have a high bearing capacity .
For geotextile design purpose , road may be subdivided into two categories : paved and unpaved roads. Paved roads are defined as those where the upper part of the pavement structure consists of bound materials such as concrete , asphalt or bitumen macadam . Unpaved roads are defined as those where this bound material is absent and the road consists of only unbound aggregate . (9)