John Rumm wrote:
Lobster wrote:

I cannot believe the answer to this isn't somewhere in the archives,
but I'll be damned if I can find it!

http://www.pavingexpert.com/concmix1.html#mix

Thanks John, I did try that site but didn't find that table TBH. Using
that it seems that if I make some assumptions, eg that my sharp sand
will be equyivalent to 10mm aggregate for calculation purposes (is
it?!), and if I change my mix from 1:3 to 1:4) and guess my concrete
grade(?!) and slump(???!) I can at least get some figures out... all
seems awfully overcomplicated though!

David