Definitions for "Metakaolin"
A highly reactive aluminosilicate pozzolan formed by calcining purified kaolinite.
Refined kaolin clay that is fired (calcined) under carefully controlled conditions to create an amorphous aluminosilicate pozzolan that consumes calcium hydroxide (lime) byproducts produced during cement hydration, resulting in increased compressive strength due to decreased lime content. Used as a 10% to 20% replacement for cement.
Metakaolin is a dehyroxylated form of the clay mineral kaolinite. Rocks that are rich in kaolinite are known as china clay or kaolin, traditionally used in the manufacture of porcelain. The particle size of metakaolin is smaller than cement particles, but not as fine as silica fume.