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Nominal cover to reinforcement is provided to 1. protect reinforcement against corrosion. 2. provide share resistance. 3. protect reinforcement against fire. 4. develop sufficient bond strength along surface area of reinforcement bars. Which of the above statements are correct?

Nominal cover to reinforcement is provided to 1. protect reinforcement against corrosion. 2. provide share resistance. 3. protect reinforcement against fire. 4. develop sufficient bond strength along surface area of reinforcement bars. Which of the above statements are correct? Correct Answer 1, 3 and 4 only

Explanation:

(i) In the design of reinforced concrete structures, the reinforcement provided is embedded in the concrete up to a particular distance from the face of the member because of the following main reasons:

  • To provide protection to reinforcement from corrosion.
  • To provide fire resistance to reinforcement.
  • To provide sufficient embedded depth so that reinforcement develops the requisite stress.

(ii) This distance is measured in different ways and known by different names:

  • Clear cover: This is the distance from the face of the member to the outermost face of the reinforcement including shear or torsion Stirrups or links.

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  • Nominal cover: This is the same thing as clear cover albeit with a different name. This term is used by the code. It is the distance measured from the face of the member to the outermost face of the reinforcement including Stirrups or links. It is the dimension shown in drawings and detailing.

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  • Effective cover: This is the distance measured from the face of the member to the center of the area of the main reinforcement, that is tension or compression reinforcement. This is the dimension usually used for design calculations.

Effective cover = Clear cover + (Diameter of Stirrups/links) + 0.5 × (Diameter of main reinforcement bars).

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Also,

Effective cover = Overall depth - effective depth.

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