How do you convert kaolin to metakaolin?
Raw kaolin was dried in an oven at 110 °C in the air for three hours, and was transformed into metakaolin by sintering in a muffle furnace at 700 °C for 4 h (Lima et al., 2014).
Is kaolin the same as metakaolin?
As nouns the difference between metakaolin and kaolin is that metakaolin is a dehydroxylated form of the clay mineral kaolinite while kaolin is a fine clay, rich in kaolinite, used in ceramics, paper-making, etc.
How metakaolin is formed?
Metakaolin is a highly reactive pozzolana formed by the calcinations of kaolinite (China clay). It has to be processed in a burning process like cement, although the temperature of production is between 700 and 900 °C as opposed to 1450 °C in the case of cement.
What is an alternative to metakaolin?
In the current study, fly ash is used to partially replace metakaolin to make geopolymer materials with a view towards application as a construction material.
Why is Metakaolin used in concrete?
Metakaolin in concrete tend to reduce the size of pores which consequently lead to obtain more strength, higher density, and more resistance to acid. Furthermore, metakaolin improves concrete resistance to alkali silicate reactions and sulfate attack.
Is Metakaolin is a geopolymer?
It was found that metakaolin-based geopolymers exhibited high compressive strength and a denser microstructure with a specific Si/Al ratio. The compressive strength tended to increase in proportion to the increasing curing temperature, but beyond a critical temperature, it decreased due to microcracks and shrinkage.
Why is metakaolin used in concrete?
Is metakaolin calcined clay?
Calcined clay – or metakaolin – is produced by heating a source of kaolinite to between 650°C and 750°C. Kaolin is both naturally occurring, as in china clay deposits and some tropical soils, as well as in industrial by-products, such as some paper sludge waste and oil sands tailings.
Where is Metakaolin found?
Metakaolin can be produced from a variety of primary and secondary sources containing kaolinite: High purity kaolin deposits. Kaolinite deposits or tropical soils of lower purity. Paper sludge waste (if containing kaolinite)
Is Metakaolin a by-product?
Metakaolin is a pozzolan, probably the most effective pozzolanic material for use in concrete. It is a product that is manufactured for use rather than a by-product and is formed when china clay, the mineral kaolin, is heated to a temperature between 600 and 800ºC.
What is metakaolin powder?
Metakaolin is the anhydrous calcined form of the clay mineral kaolinite. Minerals 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.
What are the properties of metakaolin?
1.1. Properties of metakaolin
| Property | Value |
|---|---|
| Specific gravity | 2.60 |
| Bulk density (g/cm3) | 0.3 to 0.4 |
| Physical form | Powder |
| Color | Off-White |