Concrete: How many 25kg bags of cement for one jumbo bag of ballast?

[Al-W]

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

[Al-W]

PS The jumbo bag is of standard size, and is filled so that I can just manage to cover its contents by folding the upper walls of it over and inwards.

Al

[rick]

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

[Al-W]

Thanks. The volume of the ballast looks to be very roughly about one cubic yard. Definitely less than a cubic metre. It's hard to guesstimate the volume of a bag of cement though.

Al

[The Natural Philosopher]

jumbo bag is about 850kg

so at 5:1 6 bags or maybe 5...

[newshound]

It won't be a cubic yard; a full 800 kg bag of ballast is only about a third of a cubic metre.

Plenty of calculators on Google.

[dennis]

reckons 7

[trancenotes1776]

Thanks for the that. Looks must be deceptive then; what I've got looks like twice that amount. Al

[Dave]

replying to dennis, Dave wrote: Just done a base and used just over 5 bags cement to one jumbo ballast , 11 shovels of ballast to half bag of cement, 5-1 is a good mix ??

[Brian Gaff]

Is this a new quiz? How many bags of ballast fit into a jumbo. I can see it now. things measured in animal sizes. Hang on I only have a giraffe of cement left mate. Brian

[newshound]

IIRC a Jumbo is a notional 800 kg, though it is often treated as though it is a tonne.

[paul.]

replying to rick, paul. wrote: Odd to say you should work this out by volume, then give a weight as a guide. . .