Construction of Road/ Highway
There are two types of Road Construction.
1.) Flexible Roads/Pavement
2.) Rigid Roads/Pavement
In Flexible Road Construction
Total length of thickness=570mm
a) GSB Layers=300 mm
b) Wet mix macadam (WMM) Layer=120 to 150 mm
c) Dense Bituminous Macadam (DBM) = 80 mm
d) Bituminous Course (BC)/Wearing Course = 40 mm
Total =300+150+80+40
=570 mm
Flexible Pavement
A pavement which consists of a mixture of asphaltic or bituminous material and aggregate placed on a good quality and compacted granular material is called flexible pavement. Example of flexible pavement water bound macadam roads .
The essential points of flexible pavement
(i) The flexible pavements have self revive properties.whatever deformation arise in flexible pavement due to massive wheel loads, it is regeneration to some extent after some time.
(ii) The temperature variations due to changes in atmospheric conditions do not produce stresses in flexible pavement.
(iii) The structural capacity of the flexible pavement is influenced by strength of the sub-grade.
(iv) The cost of construction of flexible pavements is less than compared to rigid pavement.
