EMBANKMENT CONSTRUCTION | DIFFERENCE BETWEEN SUBGRADE & EMBANKMENT | IMPORTANT MORTH SPECIFICATIONS. 

MORTH SPECIFICATION ( V REVISION) 2013
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SUBGRADE
Subgrade is the main part of the any earth work .They are widely used in road, railway and airport runway construction but here we will discuss sequence wise working methodology for the earthwork in subgrade for any highway work.
MATERIAL USED
The material used in Sub-grade shall be soil, moorum, gravel, a mixture of these or any other material approved by the Engineer. It shall be free from logs, stumps, roots, rubbish & any other material detrimental to the stability of structure.
METHODOLOGY
After completion of embankment, the limits of sub-grade shall be marked by fixing pegs at regular intervals before commencing the earthwork. Construction toe line shall be more than the design toe line for proper construction of the edges.
The Embankment top shall be levelled to facilitate placement of first layer of Sub-grade, scarified, mixed with water and then compacted by rolling so as to achieve minimum dry density as specified in the modified Technical specification.
The compaction shall be done with the help of Vibratory Roller of 8 - 10 Ton static weight with plain or pad foot drum or heavy pneumatic tyred roller of adequate capacity capable to achieve required compaction.
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