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What are cover blocks I Why do we use Cover Blocks for a Slab I cover blocks for the slab, beam, column

Questions related to Cover blocks:

1Q) What are cover blocks?
A) Concrete Cover Blocks is also known as Spacers which is used to provide spacing at Slab, Column, Beam & foundation. Application is very simple as place COVER BLOCK between Rebar(Reinforcement bar) and ground/wall.

2Q) What is the cover block in RCC?
A) If cover blocks are not put, then the reinforcement bars will be visible on the bottom side of a slab or beam and due to this, the moisture from the atmosphere may attack the steel reinforcement, and slowly the bars will be get rusted and subsequently, the area of the cross-section will be reduced and resisting moment will be reduced and loads carrying capacity reduces leading to failure of the structure. Hence IS code 456:2000 gives clearly the clear cover to be provided for slab or beam or column. depending upon the exposure conditions.

3Q) Why cover blocks are used?
A) They are used to maintain a specified distance between the TMT rebar and the shuttering.

4Q)What is the minimum cover for the slab?
A) As per IS 456 The minimum cover for the slab is 15mm

5Q)Why do we use Cover Blocks for a Slab
A) It is mainly used to prevent reinforcement steel from corrosion. The corrosion takes place when the reinforcement steel comes in contact with the atmosphere, so the cover acts as a physical barrier.

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