Cover Block:
It is a block of approved material and appropriate size used to position the reinforcement such as to result in the required distance between the reinforcement and concrete surface.
- Cover blocks shall be non corrosive and of following material
- Plastic, PVC or Concrete of the same grade of Concrete.
- Actual concrete cover shall not deviate by nominal cover by +10 mm and -0 mm.
- Detail of Cover (in mm) for various Structural members as per degree of exposure shall be as follows:
Why we must use cover blocks?
- When doing RCC work it is important to embed the steel in the concrete (also known as cover) so that the rebar doesn’t corrode and to provide fire protection to the rebar
- If we don’t provide the recommended cover the rebar will corrode with time and will ultimately result in premature failure of the structure
- Thus using cover blocks enhances the life of the structure significantly without adding much to the cost