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Question
What is the minimum vertical distance between the rows of bars if the beam is constructed with 20 mm size aggregate and reinforced with 12 mm diameter bars?
A.
20 mm
B.
12 mm
C.
14 mm
D.
15 mm
Answer ( Option D)

15 mm

Solution

The minimum vertical spacing between bars is smaller of the following 
 
Given 20 mm aggregate size
    
so maximum of =(15mm  or 2/3*20=13.33mm)
We should adopt 15 mm
 
 

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