Micrasil is super pozzolanic product produced from a naturally occurring aluminosilicate mineral of volcanic origin. It is only physically processed and brought to a powderous form with the mean grain size below 5 μm and with 99,9% of its mass below 45 μm. It consists essentially of SiO2 and Al2O3, cumulatively at least 85% by mass and it has pozzolanic properties (“natural pozzolan”) since more than 90% of its mass is in amorphous glassy phase, easily dissolvable in high pHs like in hydrated cement mixes (concrete, fiber cement).
The main application of this material is in both structural and non-structural Portland cement based concrete mixtures with the purpose to increase durability and resistance in chemical attack (chlorides, sulphates), suppress the alkali silica reactions and lower the heat of hydration. The typical dosage of the product is in the range 10 to 15% by mass of the total cementitious component.
Other applications are in fiber cement boards, mortars and tile adhesives, as well as during cementing in oil and gas drilling.