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Highway Engineering - Engineering

Q1:

For a poorly graded sub-grade soil, thickness of sub-base, is

A 10 cm

B 15 cm

C 20 cm

D 25 cm

E 30 cm

ANS:E - 30 cm

Subgrade : 15 cm.
Subbase : 25cm.
Base : 30cm.

For poor subgrade, we can add 5 cm more.