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Sílica ativa em pó adição mineral Novakem

Active Silica Powder

Powdered Mineral Additive

NBR 13956/12

Active Silica Powder (Mineral Powder Additive)

Active silica powder is an ultra-fine mineral additive with binding properties in the presence of Portland cement, promoting increased concrete durability due to its pozzolanic properties . It originates from the metallurgical manufacturing of ferrosilicon alloys and therefore exhibits great uniformity in its chemical composition and physical properties.

Sílica ativa em suspensão Novakem

It is a material with at least 85% silica present in the amorphous phase, with an average particle diameter smaller than 1 micron (100 times finer than cement on average), a specific surface area between 15 and 30 m²/g, and composed of spherical and regular particles. It meets the ASTM C 1240 or NBR 13.956/12 standards.

Active silica powder: 10, 15 kg bags or bulk

  • Average particle size: 0.40 microns

  • Retained on a 45 micron sieve: <= 10%

  • Pozzolanic activity index in Portland cement: > 105% (at 7 days)

  • BET Specific Area : 15 to 30 m²/g

  • SiO2: > 85%

  • Na2O: < 1.5%

  • Humidity: < 3.0%

  • Loss on Ignition: < 6.0%

Sílica ativa em pó adição mineral para concreto

Applications in concrete for improving durability or optimizing cement consumption.

  • All types of pumped concrete;

  • Foundations and piles;

  • Concrete in maritime regions and aggressive environments;

  • High-performance concrete.

What are the advantages of using activated silica powder?

Among the main advantages of using powdered silica fume in concrete, the following stand out:

  • It improves mechanical properties in the hardened state , such as abrasion resistance, compression strength, and tensile strength;

  • It reduces the permeability of the concrete microstructure, thus providing greater durability against attack from external agents and aggressive environments;

  • Reduces segregation and bleeding in concrete;

  • Due to the larger specific surface area, depending on the added content, a small increase in the dosage of water-reducing additive is required;

  • High performance with low application cost ;

  • Easy integration into the batching plant.

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