Minimum Cover For Reinforcement in Cast-In-Place
Concrete cover is assumed to be the primary measure considered to stop influences of aggressive elements on the reinforcement steel bars. that's why utmost cautions are needed during concrete cover thickness design and its construction. Commonly, the thickness of concrete cover is specified supported the sort of the ferroconcrete member and therefore the environment during which the structure is made . during this article, concrete cover specifications supported various most ordinarily used codes are going to be discussed.
The clear cover is that the distance between the outer surface of concrete to the closest surface of reinforcing bar.
Clear cover varies in several conditions. The clear protect cast-in-place concrete is given within the below table.
| Sl. No. | Conditions | Minimum cover (inches) | ||
| 1 | Concrete cast against and permanently exposed to earth | 3 | ||
| 2 | Concrete exposed to weather or earth | No. 6 to no. 18 bar | 2 | |
| No. 5 bar, W31 or D31 wire and smaller |
1 1/2 | |||
| 3 | Concrete unexposed to weather or in contact with the ground. | Slabs, Walls, and Joist | No. 14 and no. 18 bar | 1 1/2 |
| No. 11 bar and smaller | 3/4 | |||
| Beams and columns | Primary reinforcement, ties, stirrups, and spirals | 1 1/2 | ||
| Shells and folded plate members. | No. 6 bar and large bars. | 3/4 | ||
| No. 5 bar, W31 or D31 wire and smaller. | 1/2 | |||
| 4 | Concrete tilt-up panels cast against a rigid horizontal surface, like concrete slab. | No. 8 bar and smaller. | 1 | |
| No. 9 to no. 18 bar. | 2 | |||