The charts show some different steps in the production of cement and the consequent concrete, highlighting for each passage the equipment needed.
Looking the production of cement, the first stage consists of shatter limestone and clay in a crusher, then the result powder needs to be mixed in a mixer and heated while rotating. After that, thanks to an employment of one grinder, we have the cement that can be put in bags for selling.
Instead, for concrete production, we must start with a 15% of cement and add in a concrete mixer: 25% of sand, 10% of water and finally 50% of gravel (a lot of very small stones).
To conclude and summarise information’s, we can definitely say that cement is essential for the production of concrete for building purposes. We shouldn’t confuse these two materials: cement is a powder; concrete is an aggregate of cement and other materials.