Concrete, weight/cubic metres?

Possibly a stupid question, but how many 25kg bags of ballast (with a 5:1 mix) would it take to make 1 cubic metre of concrete?
I really have no idea how to work this out myself.
Adam
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A little appreciated property of the Google search engine is it's ability to answer 'plain language' queries: I typed the search string "How many 25Kg bags of ballast to make I cubic metre?" and in 0.69 seconds it responded by pointing to a Community Forum discussion about shed bases. http://www.screwfix.com/talk/thread.jspa?threadID 22&tstart=0
HTH
--

Brian



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I have used Google as a calulator and a thesaurus before. I did not know about that search option.
My search for cubic metres etc was crap. Cheers for that info.
Adam
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A lot. You really need to think about buying in bulk.
Figures I have are for a cubic yard but I am sure you will be able to work out the fiddle factor without any help from me. Tons and Tonnes are almost interchangeable.
@ 5:1 1.446 tons all-in mix and 0.231 tons of cement.
If you want to go down the equivalent 1:2:4 route that would require 0.513 tons of sand and 0.933 tons of gravel for the same amount of cement.
--
Roger Chapman

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contains these words:

Thank you Roger.
I will not be mixing a cubic metre in one go! I now have an idea how much ballast is needed for the smaller jobs I need to do. It will be bulk buying as it is much cheaper (30% cheaper)
Cheers
Adam
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The density of concrete varies but is generally taken to be approximately 2400 kg per cubic metre (2.4 tonnes). If you're using a 5:1 mix then divide 2400 by 6 units and multiply by five to calculate the mass of ballast required for a cubic metre.
2400/6 = 400 400*5 = 2000kgs.
Therefore the number of 25kgs bags required would be 2000/25 = 80. I have ignored the mass of the water to be added plus the moisture already present in the ballast for simplicity.
I assume you're using 1 cubic metre as a unit volume otherwise you will need to order in bulk as the man said.
AT
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ARWadsworth wrote:

Pick your mix from the tables here:
http://www.pavingexpert.com/concmix1.html
--
Cheers,

John.

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