Cover Block used in Column
In order to used in the column normally nominal size of cover block is 40 mm but it depends upon size of the structure.
The cover blocks lifts the rebar up by about 20 mm to 75 mm and becomes a permanent and integral part of the poured concrete.
It ensure that no part of the rebar sags and minimizes that required concrete cover age during pouring of concrete.
Normally cover block should be used the following concrete stages in the Building
1. footing Area
2. Column
3. Beam
4. Stair
5. Slab
Column casting
Formwork in column