silikafume

Silika Fume, also known as microsilica, is a pozzolanic material composed of non-crystalline silicon dioxide. It is a byproduct of the production of silicon metal or ferrosilicon alloys. The material is collected from the exhaust gases of these high-temperature furnaces. Its primary characteristic is its extremely fine particle size, significantly smaller than cement particles. This fine particle size contributes to its effectiveness as a pozzolan, meaning it reacts with calcium hydroxide, a byproduct of cement hydration, to form additional cementitious compounds.

When added to concrete, silika fume significantly enhances its properties. It improves compressive strength, reduces permeability, and increases resistance to abrasion and chemical attack. The fine particles fill the voids between cement particles, leading to a denser and more cohesive concrete matrix. This densification is crucial for applications requiring high performance, such as in marine environments, bridges, and high-rise buildings. It can also improve the workability of fresh concrete, although in higher dosages, it may require adjustments in water content or admixtures. The use of silika fume is a well-established practice in modern construction for achieving superior concrete durability and strength.