Cement
Roman Cement = Lime + Pozzolana
Pozzolana =
Volcanic Ash
Roman Cement hardens under water
(Portland) Cement = Limestone + Clay
The
Limestone and Clay are cooked to molten form, it becoms solid upon cooling (the
result is called a
clinker). This material is then ground with gypsum to form cement.
Gypsum is a sedimentary rock mineral.
Cement + Sand + Gravel = Concrete
Cement + Sand = Mortar
Gypsum heated to drive out water = Plaster (of Paris)
Plaster is a fine white powder.
Cement + Sand + Lime = Stucco
Water must be added to any one of the above
before its application.