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Q.

What is meant M15 ,M20 ,M25 Concrete? What are standard mix ratio for these grades?

Tags: grades, concrete, standard mix ratio
Asked by ashok kumar, 24 Apr '07 07:46 pm
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Answers (24)

1.

Concrete is a construction material that consists of cement (commonly Portland cement), aggregate (generally gravel and sand), water and admixtures.

Engineers usually specify the required compressive strength of concrete, which is normally given as the 28 day compressive strength in megapascals (MPa) or pounds per square inch (psi). Twenty eight days is a long wait to determine if desired strengths are going to be obtained, so three-day and seven-day strengths can be useful to predict the ultimate 28-day compressive strength of the concrete.

Potable water can be used for manufacturing concrete. The w/c ratio (mass ratio of water to cement) is the key factor that determines the strength of concrete. A lower w/c ratio will yield a concrete which is stronger and more durable, while a higher w/c ratio yields a concrete with a larger slump, so it may be placed more easily.

The water and cement paste hardens and develops strength over time. In order to ensure an economical and pract ...more
Answered by Krishnakumar G. Nair, 24 Apr '07 08:26 pm

 
  
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2.

M-15 = 1:2:4 (cement:stone:sand)
m-20= 1:1.5:3 (cement:stone:sand)
m-25= 1:1:2 (cement:stone:sand)
Answered by Santosh Shaw, 02 Jun '09 11:26 am

 
  
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3.

M15..1:2:4, m20 1:1.5:3 m25 1:1:2
Answered by SIDHAIYAN, 23 Oct '10 03:29 pm

 
  
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4.

M20 - 1:2:4
m25 - 1:1:3
m30 - 1:1:2
Answered by siraj sirru, 21 Nov '10 12:21 pm

 
  
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5.

They refer to strength of cement. A cubical block made with that cement can take a load of 15 MPa(Mega Pascal), 20 MPa, 25 MPa resepctively
Answered by karthik l, 24 Apr '07 07:51 pm

 
  
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6.

M stands for mix & 15,20 & 25 this numrical valu stands for required compressive strength in mpa
Answered by Yogesh Thakare, 27 Nov '11 11:40 am

 
  
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7.

M stands for mix and 15 stands for strength of concrete 15 n/mm2
Answered by siraj maa, 04 Oct '11 05:00 pm

 
  
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8.

M15 meant is mix ratio of Cement, sand, aggregate(1:2:4).
Source: internet
Answered by Rishikant Nimlekar, 02 Jul '11 08:41 pm

 
  
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9.

M20
Answered by Yasir Khan, 18 Mar '12 11:16 pm

 
  
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10.

These numbers i.e. M15 or 20 shows the compressive strength of 15cm cube of concrete after 28 day cureing in Mpa. Regarding mix ratio you can get information on www.concrete.org.uk
Answered by KUNJAN VYAS, 24 Apr '07 07:52 pm

 
  
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