concrete calculatttiiiiiioonnss

[robinhood]

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]

any idea greebo?

 

[bubbles65]

:RpS_scared:

 

[essexandy]

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)

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.

 

[robinhood]

Cheers andy . Access is very tight so I have to use bags,

 

[nickelarse]

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.

so 95 bags of sand??

 

[essexandy]

so 95 bags of sand??

What a tw@t I am, I think he probably knew what I meant.
Either that or it's going to be difficult getting a surface on it.:-0

 

[mark ross]

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

 

[McPlaster]

Too strong, rethink needed.

 

[pohhop]

[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]

Kg of cement Kg of sand Kg of gravel Litres of water You will need approximately..... for C 20 mixture Kg of cement Kg of sand Kg of gravel Litres of water

 

[pohhop]

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

 

[pohhop]

oops again, donkey didn't look at date it was posted.

 

[Fatarm]

Doh!! !

 

[warriorupnorth]

oops

 

[lilharbs]

Oh fook it