# Civil Engineering - UPSC Civil Service Exam Questions - Discussion

Discussion Forum : UPSC Civil Service Exam Questions - Section 1 (Q.No. 47)
47.
A reinforced concrete slab is 75 mm thick. The maximum size of reinforcement bar that can be used is
12 mm diameter
10 mm diameter
8 mm diameter
6 mm diameter
Explanation:
No answer description is available. Let's discuss.
Discussion:
9 comments Page 1 of 1.

Kapil said:   1 year ago
Right! Thank you all.

Hemant said:   2 years ago

Then 100 mm thick slab maximum reinforcement is 100/8 = 12.5.

This means 12 mm.

Is it right or wrong?

Dinesh said:   4 years ago
Max diameter of bar using 1/8.

Himie said:   5 years ago
As per guideline it should be less than 1/8.

Sam said:   5 years ago
Why 10mm is not taken? Please explain.
(1)

Anomii said:   5 years ago
Since the decimal point(9.4) is less than 10 so it cannot be rounded to 10mm.

Ajith said:   6 years ago
As per IS 456 2000.

Max diameter of bar is 1/8*slab thickness.
So 75/8 = 9.4 mm.
So 10 mm diameter use.
We should use higher dia nearest to 9.4 mm.

Gubi said:   8 years ago
As per IS 456 2000.

Max diameter of bar is 1/8*slab thickness.

So 75/8 = 9.4 mm.

So 8 mm diameter use.

Mayank said:   10 years ago
As per IS 456 2000 max dia of bar is 1/8 of member thickness so 75/8 = 9.4 mm.

So 8 mm dia use.