Cement consumption

[sahu.mgse]

Dear All

What is normal cement consumption (no. of bags) for 5inch thick RCC slab for 1000sft area.

regards
sahu

[khan]

My Mestri was telling around 6 cement bag per chadar(10*10 sq ft). But this does not include the beams which would be additionally 13 inches more. Generally 18 inches beams. For my RCC slab of 5.5 inches. It took around 80 bags of cements for 1000 sqft with beams of 18 inches(missed giving dimension in the earlier post). But better to buy more, as anyways the cement dealer will take it back if you agree beforehand except for the delivery charges.

Regards,
khan

[Manjunath711]

Dear Khan,

its hard to take into fact as for cement consumption took 80bags for 10x10sqft..

With your dimension said it is sufficent to for even 5"thk slab.

Regards
Manjunath.K.N.
Structural designer

[nabikm]

I had my first floor roof concrete done last fortnight and cement consumption for roof of 600sqft was 52 bags.Even for ground floor roof concrete it was same.

Regards,
Abdullah

[Manjunath711]

Check with Mix ratio, Normally people go for M20 mix.

[KVS Setty]

Hello,

About one week back we did roofing for first floor (this is the third roof in a total of four).
Total plinth area is 850sft (26.5ft X32ft) but roofing area is approximately 750 sft ( 850 minus 50sft sky light area minus 50sft stairs area)and 5.5" roof thickness,they consumed exactly 67 bags of cement. This includes beams and 9 stair steps of 3ft width.Beams are 2 ft by 8"thick in some places and 1.5 ft by 6" in some other areas. RCC mixing ratio is for M20 (1:1.5 : 3) but actually on site they used 2:4:5


Oh! lots of numbers and digits to digest.

Thanks

[Manjunath711]

Hi KVS Setty,

1bag of cement = 1.25cft.
The ratio what you told for M20 is correct, Meanwhile we have to adhere for min. M20 grade present days.
Moreover for the area of house (750sqft) frankly telling it does not require 2ft depth beam and also 5.5"thick slab. This could have been done with 1'6" beams with and 5" thick slab, and with proper analysis the beam width could have been made for 6". I am not telling contractor is wrong and I am right. Analyze with the right people before doing any job, its just a national waste with the extra concrete or steel as it will just takes a rest.

Regards
Manjunath.K.N.

[sateeshpnv]

1 bag of cement for 10 sft, including normal beams.

BTW, is it true that minimum recommended width of any column is 8"?

I have seen a scary column in an adjacent house - they used 6" and only 3" of it was resting on the plinth.

[Manjunath711]

hi,
We can go with 6" column also, but in some buildings with higher loads i.e., with highrise building we could not satisfy with the bi-axial eccentricities in the column.

And moreover if 20dia rods are provided in the column it wil be difficult to place over there.

Regards
Manjunath.K.N.
Structura Designer

[mcneha]

Hello Manjunath711 Sir,

Recently I had come across a post with photo where the plinth beams are 2'0" in height for a residential building. Is it required to have such heavy plinth beams. In many places I had observed in the photo, the plinth beams are uniform in size even where they are not at all passing through or ending on columns. Please post your views in this regard for the awareness of the members.

Regards.
CHANDRASEKAR