Clinker
Clinker is used in the manufacture of Portland Cement. Clinker comes as lumps or nodules, usually from 3-25 mm in diameter, produced by sintering limestone and alumino-silicate (clay) during the cement kiln stage. Clinker is ground (usually with the addition of gypsum, that is, calcium sulphate dihydrate) to become Portland cement. It may also be combined with other active ingredients or chemical admixtures to produce, ground granulated blast furnace slag cement, pozzolana cement and silica fume cement.
Clinker, if …