VARIOUS COMPONENT OF ROAD SURFACE
Component of Road
The following are the various components of road surface
1. Sub Grade Top of the ground on which the foundation of a road rest is called sub grade. The level of the sub grade is decided by subtracting the total thickness of the pavement from the finished level of road pavement. Strength and durability of road depends on its sub grade.
2. Sub Base When the bearing capacity of soil is poor and the intensity of traffic is high an additional layer is provided between soil and sub grade. This additional layer is called sub base.
3. Base The foundation of a road is called base. Thickness of base should be more than 30cm. the base coarse receives the impact of traffic through wearing coarse. The load of traffic is transferred to sub base and sub grade through base.
4. Wearing Coarse The super structure of road is called wearing course or road surfacing; it should be stable, durable and impervious. The wearing coarse may be laid in 1 or 2 layer according to the total design thickness and each layer should not exceed 10 cm. thickness of road surfacing depends upon type of traffic, intensity of traffic and type of materia
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