The invention provides methods and compositions for treating wash water from concrete production with carbon dioxide. The treated wash water can be reused as mix water in fresh batches of concrete.

The invention provides methods and compositions for treating wash water from concrete production with carbon dioxide. The treated wash water can be reused as mix water in fresh batches of concrete.

The invention provides methods and compositions for treating wash water from concrete production with carbon dioxide. The treated wash water can be reused as mix water in fresh batches of concrete.

Aspects of the present disclosure relate to a method for making granules. The method can involve providing ceramic cores with no greater than ten percent porosity. These cores can be fluidized in a fluidized bed, and an aqueous dispersion containing ceramic particles, an alkali silicate precursor, and a hardener precursor can be delivered into the bed. The ceramic cores can be coated with at least one layer of this dispersion. The coated cores can then be cured to form granules, each featuring a shell surrounding the ceramic core. The shell can include an inorganic binder, which is a reaction product of the alkali silicate precursor and the hardener precursor, and ceramic particles that can constitute more than 50 percent by weight of the shell.