Question
Download Solution PDFIn mix design for M25 concrete, the assumed standard deviation for estimation of target mean strength of concrete mix, as recommended by IS 456 ∶ 2000 is (in N/mm2):
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe assumed value of standard deviation for initial calculations as per IS 456 – 2000 are given below in the table:
|
Sl. No |
Grade of Concrete |
Characteristic compressive strength (N/mm2) |
Assumed standard deviation (N/mm2) |
|
1. |
M10 |
10 |
3.5 |
|
2. |
M15 |
15 |
|
|
3. |
M20 |
20 |
4.0 |
|
4. |
M25 |
25 |
|
|
5. |
M30 |
30 |
5.0 |
|
6. |
M35 |
35 |
|
|
7. |
M40 |
40 |
|
|
8. |
M45 |
45 |
|
|
9. |
M50 |
50 |
|
|
10. |
M55 |
55 |
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