On 08/06/2017 17:51, Al-W wrote:
It looks like a reasonably full jumbo bag from a decent builder's merchant.
I'm thinking of a 5:1 mix of ballast to cement. Anyone know how much cement I need for the whole jumbo bag of ballast?

Thank you,

Al



Need to know what job is ?
That will advise the mix.

A GP mix using all-in would be done on 5:1 by volume

Mixes should be done by volume not weight ..... if you want a guide,
bulk bag going to be around 750Kg