Answer / guest

M stands for Mix
20 stands for Compressive strength of concrete in N/ mm2

Answer / rubes

M stands for mix, of concrete cube with a compressive
strength of 20 N/ s.mm at 28 days

Answer / sekar.k

M - Stands for MIX ; 20 - Stands for characteristic
compressive strength of concrete at the age of 28 days

Answer / partha mitra

M - Stands for MIX ; 20 - Stands for characteristic
compressive strength of concrete is 20 N/Sq.mm after 28
days curing.

Answer / guest

m stadnds for mixture and numerical value indicates is
strength after 28 days curing period

Answer / dinesh gaikwad

M stands for mix and 20 is its compressive strength in
n/sqmm for 28 days.

Answer / guest

m stadnds for mixture and numerical value indicates is
strength after 28 days curing period

Answer / surjit

M means mix design 28 days after curring 20n/mmsq called m20

Answer / sundar

charter strength of of concrete is called M20 and M25
M20 is mixing ratio is 1:1.5:3 , M25 is 1:1:2

Answer / reddy

m is mix ic design & 20 is charectoristrength

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Q1) I am having an interview in a construction company for a large sewage project . Since I have not done any such project , there are some queries from my end. Pls. help me to solve them. I will be thankful to you :- a) Normally for large project 400-600 houses & around 1600 peoples , how much dia pipe is used and which type of pipe is used? b) For trenching , I have heard that IS 1200 implies, what are the rules of calculating earthwork in case of depth of 2m or above ? c) To prevent soil to fall when depth of trench is more , what steps are taken and how there qty. is calculated . Like I have heard about timbering . what is this ? d) What are the rules for disposing off the excavated soil ? e) How the pipes that are used are being jointed? f) In case of cleaning on choks , is there any intermediate things provided? g) For foul gases any outlets are provided thru out length of pipeline? h) What is the flow digram like from houses thru small pipe to main pipeline than where main pipeline disposes wastage ? i) Any other thing that has to be kept in mind while calculating earth work for excavation like steps are made and other things? How earthwork is calculated in case of steps ? Pls. explain with a sketch. Regards,

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