Carpenter Red Seal Exam Prep · Question
A carpenter is supervising the placement of 20M reinforcing bars with a clear spacing of 50 mm in a beam. The concrete will contain 19 mm aggregate. Which factor determines the minimum clear spacing required between parallel reinforcing bars according to CSA A23.1?
According to CSA A23.1, the minimum clear spacing between parallel bars in reinforced concrete must not be less than the nominal maximum size of the coarse aggr
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Question: A carpenter is supervising the placement of 20M reinforcing bars with a clear spacing of 50 mm in a beam. The concrete will contain 19 mm aggregate. Which factor determines the minimum clear spacing required between parallel reinforcing bars according to CSA A23.1?
Answer options:
- The diameter of the reinforcing bar
- The desired strength of the bond between concrete and steel ✅ The nominal maximum size of the coarse aggregate
- The overall depth of the concrete member
Correct answer: The nominal maximum size of the coarse aggregate
Explanation: According to CSA A23.1, the minimum clear spacing between parallel bars in reinforced concrete must not be less than the nominal maximum size of the coarse aggregate plus 5 mm, or the diameter of the bar, or 25 mm, whichever is greatest. This ensures proper concrete flow and consolidation around the rebar.
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