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Default C20 concrete mix


After considering the much appreciated advice given here, I've now decided
to bite the bullet and pour a concrete base for my shed.

AIUI C20 is a suitable mix.
If I use all-in ballast, would I need to mix 1:5 or 1:6?

As far as quantities go, it's about 0.75m3. So, if using say 1:5, I'd need:
50 x 25Kg all-in ballast
10 x 25kg bags of cement

Does this sound about right?

 
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