Minimum clear distance between parallel bars must be at least the greater of the bar diameter (1 inch) or 1.33 times the size of the largest aggregate. Which statement best expresses this rule?

• A. 0.75 inch
• B. The greater of 1 inch and 1.33 times the largest aggregate
• C. 1.33 inches
• D. The lesser of the bar diameter and 1.33 times the largest aggregate

Answer: (B)

The main idea is to determine the minimum spacing by taking the larger value between the bar diameter and 1.33 times the largest aggregate size. This ensures enough space for concrete to flow around the bars and for proper consolidation, especially when larger aggregate is used.

In this problem, the bar diameter is 1 inch. So the minimum spacing is the greater of 1 inch and 1.33 times the largest aggregate. If the largest aggregate is small, the distance defaults to 1 inch; if the aggregate is large, the 1.33 times value will exceed 1 inch and set the spacing. This rule is expressed exactly by saying the minimum clear distance is the greater of the bar diameter (1 inch) and 1.33 times the largest aggregate.