Cover block thickness
To protect the bars contained in Reinforced Concrete (RCC) from corrosion, it is necessary to provide concrete cover of appropriate thickness, so that environmental impacts do not reach the bars.
As per Bureau of Indian Standards (BIS) code IS 456:2000, the minimum thickness of cover block for various structural units like roof, beam, column and footing etc. is as follows:
Number of cover blocks per m2
The number of cover blocks is determined by the pressure exerted on them. Generally, a coverblock takes up one square meter of area.
Benefits of using cover blocks in RCC
If proper cover blocks are placed in various structural units, under the bars, then the bars used in the construction can not only be protected from corrosion but the goal of strong construction can also be achieved reliably.
how to use cover block in civil engineering site
You have to keep the following things in mind while using cover block
1. There should be provision for binding with bar on the cover block. This cover block can be in the form of grooves or wires.
2. Cover blocks of proper measurement and similar size should not be replaced with bricks, ballasts, pieces of wood, etc. as they cannot prevent the absorption of moisture into the concrete. Marble/tile pieces cannot be fastened to bars, so there is a risk of them slipping out of place, so do not use them.
3. It is wrong to cover the concrete slab by pouring fresh concrete from place to place and raising the bar mesh. This may not provide a uniform thickness cover, and a small amount of concrete poured to raise the mesh may not prevent moist air from reaching the bar in the absence of compaction.
0 Comments
You can tell your thoughts about the article by commenting