What is the primary function of spacers in rebar placement?

The primary function of spacers in rebar placement is to maintain the correct position and cover of rebar. Proper spacing ensures that the rebar is placed at the right distance from the surface of the concrete, which is essential for the structural integrity and durability of the concrete element. The concrete cover protects the rebar from environmental factors that could cause corrosion. If the rebar is not positioned correctly, it may not provide the necessary tensile strength and might lead to issues such as cracking or structural failure once the concrete is poured and cured.

While enhancing aesthetic appearance, preventing rust, and increasing tensile strength are important considerations in concrete work, these do not reflect the primary role of spacers. The key purpose remains focused on the precise placement and coverage of rebar to achieve a strong and lasting concrete structure.