You know that one person who brings out the best in you? You were doing just fine before they came along, but somehow, things work even better with them around.

Silica fume has a similar effect on concrete. This ultra-fine material can improve strength and durability, while densification makes it easier to handle, store and transport.

Also known as microsilica, silica fume is an ultra-fine powder produced as a by-product during the manufacture of silicon metal and ferrosilicon alloys in electric arc furnaces. It belongs to a group of materials called supplementary cementitious materials (SCMs), which are used alongside Portland cement to improve concrete performance and, in some applications, partially replace cement.

So, what makes densified silica fume different? Its ultra-fine particles are brought together into larger clusters through a mechanical densification process. The individual particles do not become larger, but the clustering increases the material’s bulk density, making it easier to handle and transport while helping to reduce dust generation.

Its benefits extend beyond handling. In concrete, silica fume works through two main mechanisms. Its fine particles fill spaces within the concrete’s structure, reducing porosity and permeability. It also reacts with calcium hydroxide, Ca(OH)₂, produced during cement hydration, to form additional calcium silicate hydrate (C-S-H), the principal binding phase responsible for much of concrete’s strength.

Together, these effects can improve concrete’s strength, durability and resistance to chemical attack when the mix is properly designed and cured.

Sometimes, better performance comes down to understanding the material and making it work better for the application.

Looking for densified silica fume? Get in touch with Mineral-Loy to discuss your requirements.

Products & Services Beyond Expectation.