CSLB Class B General Contractor's License Practice Exam

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Prepare for the CSLB Class B General Contractor's License Test with interactive flashcards and multiple choice questions. Each question offers hints and explanations to enhance your understanding and readiness for the exam.

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What is the minimum spacing for #5 rebar according to the American Concrete Institute?

16" O.C.
18" O.C.
24" O.C.
36" O.C.

The correct answer is: 16" O.C.

The correct answer is based on established guidelines from the American Concrete Institute regarding the use of rebar in concrete structures. In typical applications, the minimum spacing for #5 rebar, which is a common size for reinforcing concrete, is indeed specified as 16 inches on center (O.C.). This measurement ensures that the concrete can properly bond with the rebar, providing the required structural integrity and strength. Using a spacing of 16 inches O.C. allows for adequate distribution of forces and enhances the overall performance of the concrete element. Placing the rebar too far apart could lead to insufficient reinforcement, compromising the structure under load. Other spacing options, such as 18, 24, or 36 inches, do not align with the standard practices outlined by the ACI for typical applications of #5 rebar and would generally be considered excessive spacing, potentially leading to weakened structural performance. Thus, maintaining a spacing of 16 inches O.C. is both a requirement for compliance with ACI guidelines and a best practice for ensuring the strength and durability of concrete structures.