small mixture cement rock and sand machine
whats the formula for mixing concrete usin potland sand. Feb 09 2006 Mix at 61 6 shovels of premix1 shovel of cement mix in a barrow with just enough water to make it workable too much water only weakens the mix and causes excessive water bleed on the top surface Topman seems to have read area 3m x5m so at 100mm deep you would need 15m3 of premix ballast is only large size crushed stone …