| Mon Jul 20, 2015 | Post #1 | JAI PRAKASH
Join date: May 2014 | Various Ratios of RCC
RCC denotes Re-in forced Cement Concrete in which cement,
sand and Bajri are laid with the help of mild steel. This is most important part
of the structure. Generally 1:2:4 and 1:1.5: 3 ratios of RCC are used in
construction work.
RCC 1:2:4
Where cement concrete 1:2:4 is used; it means 1 part of
cement 2 parts of fine aggregate/coarse sand and 4 parts of coarse aggregate.
This ratio of cement concrete gives high strength of cement concrete and is
recommended for following works.
• For general RCC work in buildings
• Bed plates
• Lintels
• RCC shelves
• Pavement etc.
RCC 1:1.5:3
Where cement concrete 1:1.5:3 is used; it means 1 part of
cement 1..5 part of fine aggregate/coarse sand and 3 parts of coarse aggregate.
This ratio of concrete also gives very high strength of cement concrete and is
recommended for following works.
• Structure carries in heavy loads
• Important RCC structure such as columns, beams, slabs,
cantilever, Chhajja, porch, and balcony etc.
• Minimize the effects of earth quake.
• Gives more strength accordingly if Tor or Ribbed steel
is used with cement concrete 1:1.5:3. | | |
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| Tue Jul 21, 2015 | Post #2 | vijay
Join date: Jul 2015 |  Post subject: Need confirmation
Hi Jai Prakash,
thanks for your response. I was able to get similar data from internet. But i am looking for re-assurance with the propositions we used. will it be strong enough for residential purpose.
Regards,
vijay G
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| Tue Jul 21, 2015 | Post #3 | Er.S.K.Jain
Join date: May 2015 | the proportion 3 : 8 : 9 means it is 1:2.67:3
The proportion required to set as per design mix by lab test or by experience to achieve required strength
Your proportion like empirical mix when the grit size is over size than 20 MM and also sand are more coarse than required.
in general in uttar pradesh we use 1:2:3 and in some case when more smoothness and flow of concrete required with more coarse sand and over size grit some contractors use 1:2.5:3
it is not bad and hope to get desired strength of M20
Better if you check with structural designer who design your building with the sample of sand and grit or by lab test of cube test if possible.
if spans are under 12'-0" x 12'-0" and thickness of slab is minimum 4.5" no need to worry.
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| Tue Jul 21, 2015 | Post #4 | JAI PRAKASH
Join date: May 2014 | Please go ahead. Do not worry.
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| Tue Jul 21, 2015 | Post #5 | vijay
Join date: Jul 2015 | Post subject: Thanks for the assurence.
Thanks for the assurence. | | |
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