If you pulverize a block of cement down to powder form could you add water and make more cement?

Answer 1

No... cement is made of what is called "quicklime", which is to say "live", therefore "quick". when it reacts with water, it becomes "slaked" lime, which is to say, slaked with water, or "hydrolized". One of the modern inventors of cement, John Smeaton, found that if he baked powdered limestone in an oven, a reaction took place in which the slaked lime became "quick" again, by driving off carbon dioxide, and when this powder was combined with water, the result formed a stone-like compound. Although crushed limestone, or crushed concrete, may have a certain amount of residual cementation (it is partly "quick"), this is not sufficient to make cement again.