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PostPosted: Sat Sep 02, 2017 4:06 pm 
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Can someone please tell me how many 25kg bag of ballast and 25kg bag of cement I need for 0.12 cubic metres hole at 5:1 ratio


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PostPosted: Sat Sep 02, 2017 6:54 pm 
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1975bloom wrote:
Can someone please tell me how many 25kg bag of ballast and 25kg bag of cement I need for 0.12 cubic metres hole at 5:1 ratio


As the answer 'google it for yourself' would not be deemed helpful, then....... I did it for you.

An accepted rule of thumb seems to be that standard C30 concrete density is 2400kg per cubic metre, therefore 0.12m3 would be 288kg (2400 x 0.12). Allowing for an irregular shaped hole, wasteage, & shrinkage on curing, let's say 300kg which at 5:1 would be 250kg ballast (10 bags) & 50kg cement (2 bags).

Provisos:

This does not allow for 25 litres water (25kg, 10% of ballast volume). Remember that "5:1" is by volume, not weight - please check my findings or wait for a builder to come along. Check that your vehicle is capable of carrying 300kg, or have it delivered. Depending on your circumstances & future plans, you may find that a bulk bag (850kg) of all-in ballast costs a comparable amount to buying 250kg in small bags (about forty quid). You will have difficulty mixing this quantity consistently by hand, consider using a mixer. If using fine aggregate (sand) & coarse (gravel) purchased separately the ratio should be 1 cement 2.5 sand 3.5 gravel (which of course adds up to an apparent 6:1, this is because sand fills the gaps between the gravel)

What's it for?



For this message the author arco_iris has received thanks - 3: 1975bloom, PaulS86, wine~o
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