CIVIL SNAPS –Β HIGHWAY ENGINEERING
Components of Road Surface
Sub Grade
The top of the ground on which the foundation of a road rest, is called sub grade. The strength and durability of a road depends upon its sub grade
Sub Base
When the bearing capacity of the soil is poor and the intensity of traffic is high, an additional layer is provided between the soiling and subgrade is called sub base
Base
The foundation of a road is also called soiling or base. The thickness of base in no case should be more than 30 cm.
Wearing course
The super structure of a road is called wearing course or road surfacing or wearing layer. It should be stable, durable and impervious.
CIVIL SNAPS – HIGHWAY ENGINEERING
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