Ballast, also known as "All-in" is mixed aggregate and sand, designed
specifically for mixing as concrete. So yes, it's fine - just add
cement, water and any additives you want.
If your mix needs "4 aggregate, 2 sand, 1 cement" you'd use 6-1
ballast/cement by volume.
Simon Avery, Dartmoor, UK
uk.d-i-y FAQ: http://www.diyfaq.org.uk /
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