WHAT IS THE NECESSITY AND IMPORTANCE OF CONCRETE COVER - LCETED

WHAT IS THE NECESSITY & IMPORTANCE OF CONCRETE COVER

In addition to integrity, strength and other design requirements, the durability of the structure during its design life is extremely important. No matter care have been exercised while designing the concrete mix, formwork and effective methods have been used for placing, consolidating and curing of concrete. But if care towards the required concrete cover is not made than the efforts made towards all the above could loose their significance, which result, pour durability of structure. The importance of concrete cover is more significant in structures located in an aggressive environment. The cover also protects the reinforcement to get it exposed in the environment and prevent the formation of oxygen concentration cell, which is the major reason for starting the corrosion of reinforcement.

Site engineer must understand the importance of the concrete cover and necessary care must be exercised to ensure it as per drawing requirement.

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The following care shall help in achieving the above objectives:

1)  Proper alignment of formwork and re steel at location, to be ensured.

2)  Concrete cover block should be of similar mix design.

3)  Proper cover blocks in columns, beam bottom, beam side and slab as per drawing requirement.

4)  Additional cover requirement for the structure where it is exposed to sea, aggressive environment or alternate drying and wetting, should be given due care as per drawings requirement.

5)  Specific care to be ensure during vibration of concrete, so that concrete cover block remains intact as placed.

6)  Cover blocks must be properly tied to the reinforcement.

7)  Properly cured cover blocks only to be used at site. There fore, as per requirement of cover block site engineer must ensured that they have to be casted well in advance.

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