From a quick Google search: 1m3 of concrete = 150l water + 250kg cement + 700kg sand + 1200kg aggregates.
Even if you used just cement and water I think you would get more than 12L from 25kg.
Even if you used just cement and water I think you would get more than 12L from 25kg.
>Even if you used just cement and water I think you would get more than 12L from 25kg.
The thing will crack very soon. The density of concrete is around 2.4g/cm3