Red Seal Ironworker (Reinforcing) Practice Exam

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What is the primary purpose of rebar chairs in construction?

To secure rebar in place
To elevate rebar for correct concrete cover
To provide reinforcement against shear forces
To protect rebar from environmental factors

The correct answer is: To elevate rebar for correct concrete cover

The primary purpose of rebar chairs in construction is to elevate rebar for correct concrete cover. This is crucial because maintaining the specified concrete cover over rebar is essential for both structural integrity and durability. Proper cover ensures that the rebar is adequately embedded to help resist environmental factors such as corrosion, and it also contributes to the overall strength of the concrete structure. Rebar chairs are specifically designed to lift the rebar to the required height, allowing for the right amount of concrete to encase the reinforcement. This positioning is important to protect the rebar from potential exposure to elements that could deteriorate it over time, ensuring the longevity and performance of the concrete element. By providing this elevation, rebar chairs help to ensure that the finished concrete structure meets engineering specifications and safety standards.