Congrete Cover Block's

What are concrete cover blocks?


Cover blocks are used to maintain a specified distance between the TMT rebar and the shuttering.
or

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.
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.