Calculator are provided for a general mix and a paving mix, the different ratio of materials are: General mix 1:5 cement:allin ballast or 1:2½:3½ cement:sharp sand:gravel. Paving mix 1:3½ cement:allin ballast or 1:1½:2½ cement:sharp sand:gravel. General metric mix 1:5 or 1:2½:3½.