concrete calculatttiiiiiioonnss

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robinhood

robinhood

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hi , i need to concrete a 2.6, x 4.2m floor at 120mm. how many 25kg bags would i need and how many bags of cement would i need , the access is tight.. :rolleyes)
 
robinhood said:
hi , i need to concrete a 2.6, x 4.2m floor at 120mm. how many 25kg bags would i need and how many bags of cement would i need , the access is tight.. :rolleyes)
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I've never worked out of bags but I think it works out to about 70 bags of sand 25 bags of sand.
I'm sure you know you should do a sub screed at that depth and some insulations don't have enough compressive strength, well officially anyway.
 
essexandy said:
I've never worked out of bags but I think it works out to about 70 bags of sand 25 bags of sand.
I'm sure you know you should do a sub screed at that depth and some insulations don't have enough compressive strength, well officially anyway.
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so 95 bags of sand?? :-)
 
90 bags ballast/ 18 bags OPC ( not mastercrete as its peak strength at 28 days is only 47Nmm2/ OPC is 62 Nmm2 )

Asuming 5:1 site mix
 
[FONT=Verdana, Arial, Helvetica, sans-serif]Depends what your using it for, light usage walking only, 75mm will be OK, if light vehicles then C20.
Is it inside or outside?
If outside wood/plastic float finish, then run a brush lightly over the top, get a piece of wood about 2 wide about 2 -3 long about 12 thick, run this around the edges.
oops, I'm presuming you know about concreting.
inside concrete finish and no tiles, get some anti dusting additive.
[/FONT]
[FONT=Verdana, Arial, Helvetica, sans-serif]You will need approximately..... for c7.5 mixture[/FONT]
[TABLE="width: 180"]
[TR]
[TD="class: smallred"] Kg of cement
Kg of sand
Kg of gravel
Litres of water



You will need approximately..... for C 20 mixture
[TABLE="width: 180"]
[TR]
[TD="class: smallred"] Kg of cement
Kg of sand
Kg of gravel
Litres of water


[/TD]
[/TR]
[/TABLE]
[/TD]
[/TR]
[/TABLE]
 
spread sheet figs didn't work.

C 7.5 Cement
308 Kg Cement
868 Kg Sand Grit sand
1848 Kg Gravel size 19 -25 mm
112 ltr water clean water


C20 Concrete:

448 Kg Cement
882 Kg Sand Grit Sand
1638 Kg Gravel size 19 -25 mm
420 ltr water clean water
 
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