Clear cover of Concrete As per ACI Code

Clear cover of Concrete As per ACI Code:

Clear Cover: Clear cover can be defined as the clear distance between the surface of the concrete and surface of the rebar.

Requirement of Clear Cover:

Clear cover is provided to protect the reinforcement from the phenomenon called corrosion and to provide fire resistance to bars embedded in concrete.

Clear Cover for  Different RCC Components:   

Clear Cover according to ACI 318 Code for plane concrete is-

Description	Clear Cover, inch
Concrete cast against and permanently exposed to earth	3
Concrete exposed to earth or weather: No. 06 through No.18 bar No.05 bar and wire	2 1.5
Concrete not exposed to weather or in contact with ground:  Slabs, walls, joists: No.14 and No.18 bars No. 11 bars and smaller	– – 1.50 0.75
Beams, Column	1.5
Shells, folded plate members No.6 bars and larger No.05 bars and smaller	0.75 0.50