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Question
```which grade of concrete is the strongest?
M20,M25,M30,M35 or M40?```
Question Submitted By :: Civil-Engineering
I also faced this Question!!     Answer Posted By

# 1
M40
 Is This Answer Correct ? 407 Yes 40 No
Manoj Sinha

# 2
M40 is the high strength concrete bcz it has 40 N/mm2
strength.others are less

 Is This Answer Correct ? 240 Yes 14 No
Vijayaraja

# 3
Its M40
 Is This Answer Correct ? 156 Yes 13 No
Vinit

# 4
M40......bcuase it have a high characteristic compressive
strenth attained in 28 days.....

 Is This Answer Correct ? 149 Yes 6 No
Gunaseelan.s

# 5
Its depend upon mix design
 Is This Answer Correct ? 192 Yes 88 No
Rajesh

# 6
M- 40 is strongest It depends upon the design mix, . M-40
means its strengthis 40n/mm2

 Is This Answer Correct ? 64 Yes 5 No
Nagesh Raj

# 7
m40
 Is This Answer Correct ? 52 Yes 6 No
Ahalnath

# 8
Strengh of M20 = 20 MPa
Strengh of M25 = 25 MPa
Strengh of M30 = 30 MPa
Strengh of M35 = 35 MPa
Strengh of M40 = 40 MPa

So, M40 has the highest strength. When the grade of concrete is directly given, mix ratio doesnt come into picture. We use proper mix to get the desired grade of concrete.

 Is This Answer Correct ? 41 Yes 2 No
Ravi

# 9
M40 becoz the ratio of cement:sand:aggregate is higher
then the other. which are the core factor for any mix. the
property of any mix like compreesive strength,
characterstic strength etc . largely depends on the ratio.

 Is This Answer Correct ? 50 Yes 12 No
Jainendra

# 10
As the grade of the concrete increses, the strength gets
increases.

 Is This Answer Correct ? 30 Yes 2 No
Shabarish