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 - rediff questions & answers

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What is meant m15 ,m20 ,m25 concrete  what are standard mix ratio for these grades  - rediff questions & answers What is meant m15 ,m20 ,m25 concrete what are standard mix ratio for these grades - rediff questions & answers Document Transcript

  • 11/14/13 What is meant M15 ,M20 ,M25 Concrete? What are standard mix ratio for these grades? - Rediff Questions & Answers rediff.com | On mobile Home Recent Questions Expert Answers Categories Search keywords Search Q. What is meant M15 ,M20 ,M25 Concrete? What are standard mix ratio for these grades? Ask a Question Get answers from the community Tags: grades, concrete, standard mix ratio Type your question Asked by ashok kumar, 24 Apr '07 07:46 pm Invite a friend | Hi Guest Sign In | Signup Hall of Fame Save | Report abuse 600 characters remaining Answer this question Earn 10 points for answering Submit 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 Comments (2) Report abuse Useful (20) Not Useful (0) Useful (13) Not Useful (3) Useful (11) Not Useful (0) Useful (6) Not Useful (5) 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 Comments (6) Report abuse 3. M15..1:2:4, m20 1:1.5:3 m25 1:1:2 Answ ered by SIDHAIYAN, 23 Oct '10 03:29 pm Comments (1) Report abuse 4. M20 - 1:2:4 m25 - 1:1:3 m30 - 1:1:2 Answ ered by siraj sirru, 21 Nov '10 12:21 pm Comments (1) Report abuse 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 Comments (1) Report abuse Useful (5) Not Useful (3) qna.rediff.com/questions-and-answers/what-is-meant-m15-m20-m25-concrete-what-are-st/621304/answers 1/2
  • 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 Comments (0) Report abuse Useful (4) Not Useful (0) Useful (4) Not Useful (0) Useful (3) Not Useful (1) Useful (2) Not Useful (0) 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 Comments (0) Report abuse 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 Comments (2) Report abuse 9. M20 Answ ered by Yasir Khan, 18 Mar '12 11:16 pm Comments (0) Report abuse 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 Comments (2) Report abuse Useful (2) Not Useful (0) Next © 2013 Rediff.com - Advertise with us - Disclaimer - Guidelines - Score & Levels - Terms & Conditions - Feedback qna.rediff.com/questions-and-answers/what-is-meant-m15-m20-m25-concrete-what-are-st/621304/answers 2/2