Why cover blocks are required to be placed before concreting? What are their sizes?
Cover blocks are placed to prevent the steel rods from getting exposed to the atmosphere, and to place and fix the reinforcements as per the design drawings. Once the steel is exposed to the atmosphere, corrosion starts. Sometimes it is commonly seen that the cover gets misplaced during the concreting activity. To prevent this, tying of cover with steel bars using thin steel wires called binding wires (projected from cover surface and placed during making or casting of cover blocks) is recommended. Covers should be made of cement sand mortar (1:3). Ideally, cover should have strength similar to the surrounding concrete, with the least perimeter so that chances of water to penetrate through periphery will be minimized. Provision of minimum covers as per the Indian standards for durability of the whole structure should be ensured.
Related Questions
- In case of a block is placed on the upper layer before completing the lower layer, a robot have to remove blocks on the upper layers. Is it considered as a violation?
- We have the blank or "skins" keyboard cover that blocks out the letters on the keys. What makes the Touch-Key Guide more efficient in stopping "hunt & peck" typing?
- Do the blocks just cover up the pain?
