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The minimum average compressive strength of common burnt clay brick of class 3.5, as per IS 1077 ∶ 1992, is:
1. 3.5 N/cm2
2. 3.5 N/mm2
3. 3.5 kg/cm2
4. 3.5 kg/mm2

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Best answer
Correct Answer - Option 2 : 3.5 N/mm2

Explanation

As per IS 1077: 1992 code, the common burnt clay bricks are classified into various classes based on their average compressive strength as mentioned below in the tabulated form:

Brick Class Designation

Average compressive or crushing strength in MPa

35

35

30

30

25

25

20

20

17.5

17.5

15

15

12.5

12.5

10

10

7.5

7.5

5

5

3.5

3.5

 

It is clear from above table that, the minimum crushing strength of common brunt clay brick is 3.5 MPa. 

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