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Concrete spacers, also known as cover blocks or concrete cover spacers, are essential components in reinforced concrete construction. They are used to maintain the correct spacing between the reinforcement bars (rebars) and the inner surface of the concrete formwork, ensuring that the rebars are adequately covered by concrete when the structure is cast.

The primary function of concrete spacers is to provide the required concrete cover to the reinforcement bars, which is essential for protecting the rebars from corrosion and ensuring the structural integrity and durability of the concrete elements. The cover also helps in providing fire resistance to the structure and maintaining the bond between the rebars and the concrete.

Concrete spacers are typically made from high-quality concrete or plastic materials and are available in various shapes and sizes to suit different construction requirements. They are designed to be placed at regular intervals along the length of the rebars, ensuring uniform concrete cover throughout the structure.