Metakaolin GMK S 5 is a high reactivity aluminosilicate pozzolanic additive that is used to increase the strength and durability of concrete and cement.
Grace Metakaolin GMK S 5 is produced by heating kaolin clay to between 1200 - 1650°F. This heat treating alters the structure of the clay to produce a highly reaction supplementary cementitious material (SCM). Grace Metakaolin is classified by ASTM C-618 as a class N pozzolan and it is produced under controlled conditions so that performance remains consistent. Grace Metakaolin has a high surface area and high reactivity. When added at ~10% by weight to cement, large increases in strength, durability, and impermeability can be achieved. GMK S 5 is manufactured by Grace in an ISO 9001:2008 certified facility in South Carolina, USA.
Physical form: Fine powder
Chemical structure: Amorphous aluminosilicate
Special Modifications: Dehydroxylated (calcined) kaolin
Specific gravity: 2.6
Bulk density, tamped at 20°C kg/m³: 500
Color: Off white
Surface Area Units m²/g: 22
pH: 5.5
Loss on Drying (1750°C) wt %: 0.5
Screen residue, 325 mesh: 10
Oil Adsorption g/100g: 75
Primary Chemistry: Amorphous aluminosilicate
Improved chemical resistance, compressive, tensile and flexural strength
Lower rapid chloride permeability diffusion
Improved efflorescence control
Reduced greenhouse emissions
Reduced expansion due to alkali-silica reaction and sulfate attack
Earlier release of formwork
Does not discolor light colored cement based products
Low compressive, tensile, and flexural strength of lightweight concrete.
Discoloration of light colored cement products caused by admixtures.
Slow development of green strength in cement based products.
Grace Metakaolin GMK S 5 is used as an admixture with Portland cement to produce high strength concrete, plasters, grouts, and mortars.
It has also been used with geopolymers to manufacture highly sustainable building materials.
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