Microsilica can ensure the compressive strength, much more exceeded the strength of normal concretes, and this is an aggregate strength that is the limiting factor here. At the application of natural aggregates the strength more than 150 N/mm2 is reached, and at the application of special high-strength aggregates, the strength of 300 N/mm2 can be reaches.
Penetrability
The effect of interstices filling created by pozzolanic spherical microparticle, favours to low the concrete capillary porosity and penetrability. Practically the impenetrable concrete can be received at reasonable microsilica content and rather low type I cement content. As microsilica effects more the penetrability than the strength, the concrete with microsilica will be always less permeable, than the concrete in type I cement of the same strength.
Protection of reinforcement