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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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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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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11/14/13 What is meant M15 ,M20 ,M25 Concrete? What are standard mix ratio for these grades? - Rediff Questions & Answers

qna.rediff.com/questions-and-answers/what-is-meant-m15-m20-m25-concrete-what-are-st/621304/answers 2/2

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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