PORESPHERE® Mikrosilica: Additive for concrete with pozzolanic effect.
Concrete admixture
Strengthens the structure
Enhanced long-term durability
By converting calcium hydroxide into stable CSH phases, the structure is strengthened from within, resulting in robust concrete that remains resilient over the long term.
Densifies the matrix and increases both early and final strength.
Fine particles enhance flowability and homogeneity.
Denser concrete provides better protection against frost, chemicals, and corrosion.
Uniform surface color due to reduced efflorescence.
Concrete optimizer through pozzolanic action.
Microsilica is a by-product generated during the production of silicon and ferrosilicon. Its spherical, ultra-fine particles are approximately 100 times smaller than those found in cement.
The "magic" happens thanks to its pozzolanic action: microsilica consists of nearly 100% amorphous silicon dioxide (SiO₂), which reacts with calcium hydroxide (Ca(OH)₂) during the concrete setting process.
This reaction produces calcium silicate hydrate (C-S-H phases)—the very binder that gives concrete its strength.
- More C-S-H = higher strength
- Less free calcium hydroxide = reduced leaching and lower susceptibility to chemical attack
- Denser structure = better protection against water, chlorides, CO₂, and frost
Properties.
Stability: Highly stable chemical and physical properties; contains no water of crystallization; acts as a neutral filler.
Corrosion resistance: Silicon dioxide (SiO₂) is chemically inert and does not react with most acids or alkalis.
Adsorption performance: Excellent resin infiltration; easy to mix without agglomeration.
Reduction of settling: Fine particle size distribution prevents segregation and sedimentation.
Benefits for concrete technology:
- Densification of the pore structure.
- Improved flowability and self-compaction.
- Higher strength, homogeneity, and durability.
- Enhanced resistance to frost, weathering, and abrasion.
Further applications.
Concrete & mortar (SCC and HPC/UHPC)
Refractory materials
Coatings
Construction & insulation materials
Plasters & leveling compounds
Fillers & reinforcing agents
General additives
PORESPHERE® Mikrosilica – the right version for your specific application.
PORESPHERE® Mikrosilika-W
= white
Content: 91% SiO₂
Mohs hardness: 7
Particle size: 350 mesh
Bulk density: 1.52 g/cm³
PORESPHERE® Mikrosilika-G
= Grey
Content: 84% SiO₂
Activity index (28 days): 108%
Specific surface area: 18.5 m²/g
PORESPHERE® Mikrosilika-W Plus
= white, highest quality
Content: 89,5% SiO₂
Particle size: 1500 Mesh
Density: 0,092 g/cm³
Specific surface area: 100 m²/g