As Per IRC Recommendations, the Sub-Grade or Sub-Base Layer Whatever

As per IRC recommendations, the sub-grade or sub-base layer whatever underlies the concrete wearing slab, in concrete pavements, must confirm to the requirement that

A) no soft spots are present in the sub-grade or sub-base
B) the base or sub-base extends to atleast 30 cm wider on either side of the width to be concreted
C) the sub-grade is properly drained
D) all of the above

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