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The purpose of cover blocks are:
i. Maintain the required cover.
ii. Prevent steel bars from getting exposed to the atmosphere so that steel corrosion may result.
iii. Place and fix reinforcement based on design drawings.
As cover blocks after concreting shall form part of concrete structure, it is preferably that the cover blocks shall possess similar strength to the concrete structure. Moreover, the size of cover block should be minimized so that the chances of water penetration to the periphery would be reduced.
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