Concrete cover blocks are an essential component in the construction of reinforced concrete structures. They play a critical role in protecting the steel reinforcement bars from corrosion and ensuring the structural integrity of the concrete. In this blog, we’ll discuss how to use concrete cover blocks effectively.
Step 1: Determine the Required Cover Thickness
Before using concrete cover blocks, it’s important to determine the required cover thickness for the reinforcement bars. This information should be specified in the design drawings and is usually measured in millimeters. The required cover thickness is the distance between the outer surface of the reinforcement bar and the surface of the concrete.
Step 2: Choose the Right Type of Concrete Cover Blocks
Once you know the required cover thickness, you can choose the appropriate type of concrete cover block. Cover blocks are available in different shapes and sizes, and the right type will depend on the spacing of the reinforcement bars and the required cover thickness. Make sure that the cover block is made from high-quality concrete and is free of any defects that could affect its performance.
Step 3: Place the Cover Blocks
The cover blocks should be placed on the formwork before pouring the concrete. The blocks should be positioned in such a way that they hold the reinforcement bars at the correct height and maintain the required cover thickness. The spacing between the cover blocks should be in line with the spacing of the reinforcement bars.
Step 4: Secure the Cover Blocks
The cover blocks should be securely fastened to the formwork to prevent them from moving during the pouring process. This can be done by tying them to the formwork with wire or using adhesive tape.
Step 5: Pour the Concrete
Once the cover blocks are in place, the concrete can be poured. Care should be taken to ensure that the concrete is evenly distributed around the reinforcement bars and that no voids are left behind. The concrete should be compacted to remove any air pockets that could weaken the structure.
Step 6: Leave the Cover Blocks in Place
After the concrete has cured, the cover blocks should be left in place. The purpose of the cover blocks is to maintain the required cover thickness around the reinforcement bars until the concrete has cured. Leaving the cover blocks in place after the concrete has cured will help protect the concrete surface from damage.
In conclusion, using concrete cover blocks is a simple yet crucial step in the construction of reinforced concrete structures. By following the steps outlined above, you can ensure that your structure has the necessary protection and longevity required for safe and reliable performance.