What is metakaolin concrete?

Metakaolin is a dehydroxylated form of the clay mineral kaolinite. Metakaolin is commonly used in the production of ceramics, but is also used as cement replacement in concrete. Metakaolin has a smaller particle size (∼1–2 μm) and higher surface area compared with portland cement, but a larger particle size than SF.

What is silica fume concrete?

Silica fume, a by-product of the ferrosilicon industry, is a highly pozzolanic material that is used to enhance mechanical and durability properties of concrete. It may be added directly to concrete as an individual ingredient or in a blend of portland cement and silica fume.

Is metakaolin a natural pozzolan?

Metakaolin is an amorphous aluminosilicate that is a highly reactive natural pozzolan produced by the calcination and dehydroxilation of kaolinitic clay at temperatures between 500°C and 900°C.

Is metakaolin an admixture?

Considered to have twice the reactivity of most other pozzolans, metakaolin is a valuable admixture for concrete/cement applications.

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 do we get metakaolin?

TSG Impex India Pvt Ltd.

What are the disadvantages of high silica cement?

Disadvantages of Silica Fume/Micro Silica In case the external temperature is high, it will lead to early dry shrinkage. Hence, it is more prone to cracks which may ultimately affect the overall strength. The construction with the silica fume concrete is difficult; as workability of silica fume concrete is poor.

How much does silica fume cost?

Condensed silica fume costs from $400-$1,000/ton, which is significantly higher than portland cement ($90/ton).

How is metakaolin produced?

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 specific gravity of metakaolin?

The specific gravity of the metakaolin is 2.6. Hence, the calcination temperatures influence the chemical compositions as well as the content of amorphous compound in the metakaolin, which will affect the reactivity of the metakaolin.

What is calcined clay used for?

On baseball fields calcined clay is used to fill in infield depressions caused by cleats and smooth the surface to provide a true baseball bounce, which contributes to the safety of the field. Calcined clay absorbs water that can help dry a field after a rainstorm, and firm the surface.

What is powerpozz™ high reactive metakaolin?

PowerPozz™ High Reactive Metakaolin is manufactured starting with specially selected high-quality kaolin clay. It is then processed using a uniquely designed open-hearth calcining furnace that assures consistent temperature control. This, in turn, produces a white, highly pozzolanic or peak reactive quality.

Where can I purchase powerpozz™ metakaolin and densified and undensified silica fume?

Advanced Cement Technologies (ACT) is a supplier of PowerPozz™ Metakaolin, and both Densified and Undensified Silica Fume (Microsilica). We supply metakaolin and silica fume both domestically and internationally through our sales and technical support service located in Blaine, Washington USA.

Can metakaolin be used in high performance concrete?

The use of high reactivity metakaolin in high performance concrete. In: Azizinamini A, Darwin D, French C, editors. Engineering Foundation Conference on High Strength Concrete, ASCE, Kona, Hawaii; 1997. p. 517–29

What is powerpozz™HRM?

PowerPozz™, derived from purified kaolin clay, is a white, amorphous, alumino-silicate which reacts aggressively with calcium hydroxide, a normal cement hydration byproduct, to form compounds with cementitious value. Advanced Cement Technologies has performed an evaluation of the performance of PowerPozz™HRM in cement mortars.