M15, M20, and M25 refer to grades of concrete based on their compressive strength. M15 concrete can withstand 15 megapascals (MPa) of compressive force, M20 can withstand 20 MPa, and M25 can withstand 25 MPa. The standard mix ratios provided are 1:2:4 for M15 concrete, 1:1.5:3 for M20 concrete, and 1:1:2 for M25 concrete. These ratios refer to the proportions of cement, stone aggregate, and sand aggregate used in the mixes.

1. 11/14/13
What is meant M15 ,M20 ,M25 Concrete? What are standard mix ratio for these grades? - Rediff Questions & Answers
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Q. What is meant M15 ,M20 ,M25 Concrete? What are standard mix ratio for these
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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
Answ ered 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)
Answ ered 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
Answ ered 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
Answ ered 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
Answ ered by karthik l, 24 Apr '07 07:51 pm
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2. 11/14/13
What is meant M15 ,M20 ,M25 Concrete? What are standard mix ratio for these grades? - Rediff Questions & Answers
6. M stands for mix & 15,20 & 25 this numrical valu stands for required compressive strength in
mpa
Answ ered 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
Answ ered 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
Answ ered by Rishikant Nimlekar, 02 Jul '11 08:41 pm
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9. M20
Answ ered 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
Answ ered by KUNJAN VYAS, 24 Apr '07 07:52 pm
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