Calcined Clay Powder

Calcined clay, also known as metakaolin, is a type of clay material that has been subjected to high-temperature calcination to transform its mineral structure and properties. The calcination process involves heating the clay at temperatures typically ranging from 500 to 900 degrees Celsius (932 to 1652 degrees Fahrenheit) in order to remove chemically-bound water and other volatile components. This transformation results in the formation of metakaolin, which possesses unique characteristics that make it valuable for various applications. It’s important to note that the properties of calcined clay can vary depending on factors such as the type of clay used, the calcination temperature, and the specific application. The unique characteristics of metakaolin make it a versatile material for improving the performance of various products in industries ranging from construction to ceramics and beyond. Calcined Kaolin or Calcined Clay is also called as Metakaolin or Chamotte.It is an anhydrous aluminium silicate a white powdered non-plastic material. It is produced when raw kaolin or more popularly known as Clay or China Clay is fired enough to reduce its crystalline water content via a process known as Calcination.

Calcined Clay Powder Uses

Mineral Transformation

During calcination, the crystal structure of the clay minerals undergoes changes. Metakaolin retains the basic framework of the original clay minerals but with altered physical and chemical properties.

Particle Size

Calcined clay particles are often finer than those of the original clay, with increased surface area and reactivity.

Pozzolanic Reaction

Metakaolin is known for its pozzolanic properties, meaning it reacts with calcium hydroxide (lime) in the presence of water to form calcium silicate hydrate (C-S-H) gel. This reaction contributes to improved strength and durability in cementitious materials.

Concrete

Calcined clay is used as a supplementary cementitious material in concrete to enhance its properties, such as strength, workability, and durability. It can partially replace cement while maintaining or even improving performance.

Ceramics

Metakaolin can be used in ceramics to modify the properties of ceramic products, such as improving the firing behavior and mechanical properties of clay-based ceramics.

Paints and Coatings

It is used as a functional filler and extender in paints and coatings to improve properties like opacity, adhesion, and rheology.

Geopolymers

Metakaolin is also used as a precursor material for geopolymerization, a process that creates binder materials similar to cement but with lower carbon emissions.

Refractories

Calcined clay is used in the production of refractory materials due to its high temperature stability and other properties.

Sustainability

The use of calcined clay in various applications contributes to sustainable practices by reducing the consumption of cement, which is a major source of carbon dioxide emissions in the construction industry.

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