General Contractor Practice Exam

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What are the standard sizes of rebar used in construction?

5 sizes: #1 through #5
11 sizes: #3 through #11, #14, and #18
7 sizes: #3 through #10
12 sizes: #1 through #12

The correct answer is: 11 sizes: #3 through #11, #14, and #18

The standard sizes of rebar used in construction are generally recognized as ranging from #3 to #18, which includes a total of 11 different sizes. This range is established according to the American Concrete Institute (ACI) and the ASTM (American Society for Testing and Materials) specifications. Rebar sizes are designated by numbers that correspond to the nominal diameter of the bar in eighths of an inch. For example, a #3 bar has a diameter of 3/8 inch, a #4 bar has a diameter of 4/8 inch (or 1/2 inch), and so on, up to #18, which is 18/8 inches (or 2.25 inches). This sizing system allows engineers and contractors to specify the right amount of concrete reinforcement needed for structural integrity. The other options either misrepresent the quantity or the range of sizes available. Understanding these standard sizes is crucial for ensuring proper design and construction practices in various projects, as they play an integral role in the strength and stability of reinforced concrete structures.