working out quantity of concrete

[joey]

hi i wanted to know how to work out quantity of concrete i know volume is LxWxD but want to know how to converte this to the amount in tonnes ? thanks

[joey]

bump

[TomVan]

A 4" pour is basically 75 square feet per yard

[rod gervais]

hi i wanted to know how to work out quantity of concrete i know volume is LxWxD but want to know how to converte this to the amount in tonnes ? thanks

OK - 27cf = 1 c yard - and 1cy = 4050# of stone concrete.

1 cu meter is 0.764554861 of 1 cy - thus 1 cm is 3096 # -

Now - a short US ton is 2000# and a Tonne is 1.102311311 US short tons - so if we work this out as follows:

1cm = 3096# (us) - which is 1.548 US tons - which is then 1.706 tonnes/

So 1 cm of concrete is 1.706 tonnes.

Rod

[joey]

so i have a total of 80ft x 1.75ft x 1.75ft =245ft3
245ft3 / 27 = 9 cubic yards.
so if i was to mix all in sand and ballast 850kg bulk bags and cement in a ratio of 4 to 1 how much ballast cement and water would i need ?
sorry to be a pain.

[rod gervais]

so i have a total of 80ft x 1.75ft x 1.75ft =245ft3
245ft3 / 27 = 9 cubic yards.
so if i was to mix all in sand and ballast 850kg bulk bags and cement in a ratio of 4 to 1 how much ballast cement and water would i need ?
sorry to be a pain.

Joey,

Please explain "ballast" - I am not familiar with the term.

Rod

[TomVan]

Please explain "ballast" - I am not familiar with the term.

aggregate

Joey,
Are you thinking of mixing 9 yards yourself? Thats quite a bit to do by yourself or with the help of friends. You might consider getting a pre mix truck delivered.
Sounds like your trying to make a design mix for cement/sand /aggregate ratios?
1 x Cement
2 x Fine Aggregate (Sand)
4 x Coarse Aggregate (Gravel/Rocks/Ballast)
If all these are dry, a water to cement ratio of around 0.55 is required. So therefore if you use 25kg of cement that will equal 13.75 litres of water. However, frequently parts of your mix like the sand will be damp, and so you will have to carefully modify your mix so that it is not sloppy.

Tom

[joey]

ballast is the term used in the uk for stone etc. bulk bag = 1 ton but not less than 850kg mixed ballast which is the stone with the sand in the correct ratio to mix concrete. for example if you had 4 tons of mixed ballast and a ton of cement that would give you 5 tons of concrete excluding the water.