concrete coverage

It should say so on the bag. Concrete usually covers the volume of the agregate used. The cement holds it together.

 

A decent grade of concrete will have a cement content, by mass, of around 330kg/m3.
Therefore on this basis a cubic metre of good quality concrete ought to contain 12 to 14 25kg bags of OPC.

 

What is OPC?

 

Ordinary Portland Cement?

 

Are those values/ calcs right?
a stack of 12 to 14 bags is nearly 1m x 1m x 1m in it's self.
Thats not including aggregate or sand?

Am I missing something here cos thta don't sound right.

 

I recently laid just under a cubic metre of concrete and used 11 x 25Kg bags so that ties up with the figures you've been given.

 

andyboy

No this was 25Kg bags of Portland Cement mixed with sandy ballast at a ratio of 4:1 ballast:cement. In other words, about 16 shovels of sandy ballast to each bag of cement.