What Is Cover Block and Use? Different Type of Cover Block Use at Site?

What is Cover Blocks?

A cover block is essentially a spacer that is used to lift the rebar mesh off the ground so that concrete may flow under the rebar.

Size Used in Construction Field.

In order to prevent corrosion of the rebar, it needs to be fully embedded in concrete. By code, it usually needs about 20 mm to 75 mm of coverage on all sides depends upon structure type. So, the cover block lifts the rebar up by about 20 mm to 75 mm and becomes a permanent and integral part of the poured concrete, ensuring that no part of the rebar sags and minimizes the required concrete coverage during the pouring of concrete.

Difference Between Clear Cover, Nominal Cover and Effective cover

Clear Cover

  1. The clear cover is the distance from the bottom of fibre to the bottom level of the reinforcement.
  2. In other words, the clear cover is the distance between concrete extreme fibre and the bottom edge of a stirrup.

Nominal Cover

  1. This is the same thing as a clear cover with a different name. This term is introduced in IS Code 456:2000.
  2. According to IS Code 456:200 section 26.4.1 Nominal cover is the design depth of concrete cover to all-steel reinforcements, including links (stirrups). It is the dimension used in the design and indicated in the drawings.
  3. It shall be not less than the diameter of the bar.
  4. Nominal cover means a clear distance between the face of concrete and the face of the main outer rebar.
  5. So Nominal cover < effective cover.

Effective cover and Nominal cover

Effective Cover

  1. The effective cover is the distance from the bottom of the fibre of the beam to the centre of reinforcement.
  2. According IS Code 456:2000 effective cover is given as follows-

Effective cover = Clear cover + (Dia of Stirrups/links) + 0.5 * (Dia of main reinforcement bars)

 

What is Effective depth?

Effective depth = overall depth-effective cover

Type of Cover Blocks?

There are different types of covering blocks based on the type of material used: –

  1. Steel cover block.
  2. PVC Block.
  3. Cement masonry cover block.
  4. Aluminium cover block.
  5. Stone cover block.

 

Why Cover Blocks Are Used In Reinforcement?

Cover blocks are used for the many following reasons:

  1. Maintain a specified distance between the rebar and the shuttering.
  2. To protect the steel reinforcement bars from environmental effects to prevent their corrosion.
  3. Provide thermal insulation, which protects the reinforcement bars from fire.
  4. Give reinforcing bars sufficient embedding to enable them to be stressed without slipping.

Cover Block in Different Structure and Different Size of Cover Block.

  1. RAFT FOUNDATION BOTTOM/SIDES : 50mm – 75 mm
  2. STRAP BEAM : 35 mm
  3. SLAB : 20 mm
  4. COLUMN : 40 mm
  5. SHEAR WALL : 25 mm
  6. BEAMS : 25 mm
  7. SLABS : 15 mm
  8. FLAT SLAB : 20 mm
  9. STAIRCASE : 15 mm
  10. RET. WALL : 20/ 25 mm on earth
  11. WATER RETAINING STRUCTURES : 20/30 mm

 

For a Better Experience Watch These Videos.

  Making Of Cover Block Site Must Watch.

 

Better Understand about Cover block Watch this Video.

All Type cover 

Question- Which type of cover block is cheap and Best??

Comment Your Answer Fast

 

 

PEB Building Definition of Terms

 

DECKING SHEET deck sheet

 

 

 

 

 

Benefits of warehouse warehouse storage System

 

 

 

 

 

 

CONVENTIONAL BUILDINGS VS GREEN BUILDINGS GREEN BUILDING AND ITS COMPONENTS

 

 

 

 

 

 

 

 

 

 

Visit our TTC Channel for more information.

Tutorials tips



Amit Sah


You may also like...

11 Responses

  1. Md salman says:

    Hello sir
    How much the Lift pit retaining wall cover size ?
    Size is 2450x3050x1500

  2. Excavation Auckland says:

    Oh My God!!! This is a great blog, I am happy that I have come across this one. It’s an amazing blog to read, so many things about what is cover block and use different type of cover block use at site. Thanks for this wonderful content.Do visit this Earthmovingandcivil.co.nz For vital information that can be used again by anyone

  3. Earthmoving Central Otago says:

    It’s a great source of knowledge; I think it will be helpful for lot of people who are looking for learning more about what is cover block and use different type of cover block use at site . Thank you very much for sharing this article.

  4. Earthmoving Kerikeri says:

    Hi, thank you for such a brilliant post. I have been reading some blogs that gives me more knowledge about what is cover block and use different type of cover block use at site; I must say this is one of the best among them. You have done a great research for I feel, thanks for sharing.

  5. Kishor says:

    How to laying cover block in footingFooting

  6. Basement Excavation says:

    Thanks for posting this useful information over here; I really hope it will be helpful to many to know about what is cover block and use different type of cover block use at the site in detail. Appreciative content!! I loved reading this article and would suggest everyone to come over this article.

  7. Nagaraj says:

    Matters is required

  8. uptoWish says:

    I like the idea of using cover blocks to create different size covers for my blog posts. This is a great way to keep my blog consistent and organized.

  1. 08/26/2020

Leave a Reply

Your email address will not be published. Required fields are marked *