What is Cover Block?
A cover block is essentially a spacer that is used to lift the rebar matrix off the ground so that concrete may flow underneath the rebar.
In order to prevent corrosion of the rebar, it needs to be fully embedded in concrete. By code, it usually needs about 2 to 3 inches of coverage on all sides.
So the cover block lifts the rebar up by about 2 to 3 inches and becomes a permanent and integral part of the poured concrete, ensuring that no part of the rebar sags and minimizes that required concrete coverage during the pour.
Types of Cover Blocks:
There are different types of covering blocks based on the type of material used:-
- 1. Wooden cover block.
- 2. Steel cover block.
- 3. PVC Block.
- 4. Cement masonry cover block
- 5. Aluminum cover block.
- 6. Stone cover block.
Why Cover Blocks Are Used In Reinforcement?
Cover blocks are used for the following reasons:
1. To maintain a specified distance between the rebar and the shuttering.
2. To protect the steel reinforcement bars from environmental effects to prevent their corrosion.
3.. To provide thermal insulation, which protects the reinforcement bars from fire.
4. To give reinforcing bars sufficient embedding to enable them to be stressed without slipping.