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 to 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 during the pour.
Cover blocks (spacer blocks) are broadly divided into two main types based on the materials used in its manufacturing process.
They are,
A. Concrete cover blocks &
B. P.V.C. cover blocks.
Both types of cover blocks are ideal for RCC structures.The concrete covers needed for the rebars in the different RCC structures depend upon the rebar diameter, type of structure, environmental conditions, and direction of the rebars (longitudinal or transverse). So, to fill up all the specific needs, cover blocks come in various shapes and sizes with different dimensions.
In this Multipurpose cover block, you’ll find slots according to the Different spacing of the building components- such as for the column and footing have a separate section respectively.
A Cover Block of 50 mm will use for the Footing, and after that, rebars are laying above the cover, and the footing mesh is prepared.
you can see below how the rebars are placed above the concrete blocks.
Cover Block of 40 mm: Place the Cover block in the Direction to fit with the Plywood. See below How it is holding both the Bar and the shuttering.
A concrete cover Block of 25 mm is placed with the shuttering.
You can clearly see in the picture how to place the 25 mm cover block with rinforcement to find the actual spacing of the beam.
Here are the important Points to know that How Much spacing should be for each structural component. and according to that the Multipurpose cover block can be laid and prepared the rebar mesh.
