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concrete grade

Tue Dec 22, 2015Total posts : 4
Rohit Sharma
Rohit Sharma
Join date: Nov 2014
Topic: concrete grade

Sir,

I have house plan for 22.5* 40.  Max room size is 11*11. All room corners has columns.  My mistri has 30 years of onsite experience in residential construction.  I told him to use m15 in column footing and m20 in columns above plinth level. He said for above mentioned grades we need vibrator and concrete mixer which is not economical option for smaller plots having maximum span less than 16 feet. He told me to use 1:2.5:4 through out the columns upto 2 storey building as we needed to mix concrete by hand and if bajri is more then concrete will not get smooth.      

    1:2.5:4, or 1:3:3 or 1:3:4 is prevailing commonly in our area when I asked some other mistris.

He will be using mixer and vibrator for rcc slab only

 

What to do sir?

Tue Dec 22, 2015Post  #1
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008
Dear Sharma
            Use cement concrete in the column 1;1.5;3 If any problem than with this ratio add extra small quantity of coarse sand nothing else.Do proper mixing by hand mix and vibrate by roding with steel bars or bamboo.
 
Wed Dec 23, 2015Post  #2
Rohit Sharma
Rohit Sharma

Join date: Nov 2014
Thank you sooooooooooo much,


1 more question. Sorry for the inconvenience caused. How much reinforcement is needed in stairs? i'm not constructing beam stairs
 
Wed Dec 23, 2015Post  #3
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008
Dear Sharma
     The MS Steel bars are according to design stair taking load. However lay 12mm MS Steel bars @ 4'' c/c with cement concrete ratio 1:1.5:3with proper mixing.
 
Thu Dec 24, 2015Post  #4
JAI PRAKASH
JAI PRAKASH

Join date: May 2014
You are going good.

 

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