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Metakaolin

Like coal fly ash, metakaolins are type II latent hydraulic (pozzolanic) cement additives that can replace part of the cement due to their hidden hydraulic properties. The raw material of metakaolin is kaolin, which belongs to the group of layered silicates and aluminosilicates.

It is produced by heat treatment (calcination) between 500 and 800°C, during which the interlayer hydroxyl groups are removed from the system. Metakaolin can react with portlandite (calcium hydroxide) and forms calcium silicate hydrate (CSH) and calcium aluminum silicate hydrate (CASH), water-insoluble phases found in concrete.

The average particle size (d50) characteristic of metakaolins is 3-5 µm, i.e. larger than microsilica, but an order of magnitude smaller than Portland cement. The specific surface area (Blaine) is between 23,000 and 26,000 cm2/g. The morphology of metakaolins differs significantly from that of coal fly ash, with typical forms being mostly platelets or amorphous (calcination-dependent) particles. Metakaolins are distinguished from other pozzolans by their high and rapid ability to bind portlandite (calcium hydroxide).

Comparison table of metakaolin types:

    Type
     Metaver I
     Metaver K 
     Metaver M 
     Metaver N
     Metaver O
     Metaver R
     PowerPozz
  


     Color
     slightly pinkish
     light grey
     white
     high whiteness
     white
     brownish white
     white
  

     Whiteness degree (Dr. Lange)
     60
     X
     71,2
     8,4
     X
     42
     77,2
  

     Recommended applications
     Self-compacting concrete, corrosion-resistant concrete, high-performance concrete, heavy concrete, radiation-shielding concrete
     Highest performance concrete, HPC, UHPC concrete, heavy concrete, radiation-shielding concrete
     High-performance, fast-setting concrete, exposed concrete, tile adhesives, repair mortars
     High-performance and white concrete, exposed concrete, heavy concrete, radiation-shielding concrete
     Highest performance white and exposed concrete, HPC, UHPC concrete 
     Geopolymers, terracotta-colored lime plasters, organic architecture binders
     Geopolymers, fair-faced concrete
  

Type	Metaver I	Metaver K	Metaver M	Metaver N	Metaver O	Metaver R	PowerPozz
Color	slightly pinkish	light grey	white	high whiteness	white	brownish white	white
Whiteness degree (Dr. Lange)	60	X	71,2	8,4	X	42	77,2
Recommended applications	Self-compacting concrete, corrosion-resistant concrete, high-performance concrete, heavy concrete, radiation-shielding concrete	Highest performance concrete, HPC, UHPC concrete, heavy concrete, radiation-shielding concrete	High-performance, fast-setting concrete, exposed concrete, tile adhesives, repair mortars	High-performance and white concrete, exposed concrete, heavy concrete, radiation-shielding concrete	Highest performance white and exposed concrete, HPC, UHPC concrete	Geopolymers, terracotta-colored lime plasters, organic architecture binders	Geopolymers, fair-faced concrete

Quality:

Metaver metakaolins are high-purity, grade “A” metakaolins according to NF EN 206-1/CN standard, with a performance declaration and quality certificate.

Packaging:

Metaver I, Metaver M, Metaver N:
20 kg bags on 720 kg pallets, in 1,000 and 500 kg Big Bags, and in bulk
Metaver K, Metaver O:
In 25 kg bags, in 1,050 kg Big Bags
Metaver R:
In 1,200 kg Big Bags, and in bulk
Power Pozz:
In 20 kg bags on 960 kg pallets, or on 500 kg pallets

Application areas:

Fair-faced concrete, white fair-faced concrete
MSZ 4798: (2016) concrete (concrete resistant to municipal, industrial and agricultural fluids)
MSZE 15612: (2014) concrete (prefabricated concrete sewer manhole elements)
High-performance HPC, UHPC concretes
Rapid-setting concretes
Self-compacting concretes
Lime renders
Concretes resistant to dissolution and sulfate-swelling corrosion
Radiation-shielding concretes
Repair mortars
C2TE, C2FTE, C2 S1 and S2-classified tile adhesives

Technical data sheets for the products can be found here.