The role of microsilica fume in concrete

As an admixture, microsilica fume can improve the cohesion and bleeding properties of concrete due to its volcanic ash effect and particulate effect. It can also improve the material strength, service life, and impermeability of concrete. When microsilica fume replaces part of the fly ash, the workability of the concrete mixture is reduced. However, with the addition of microsilica fume, the mechanical properties of the concrete after hardening are significantly improved. When the added amount of microsilica fume is The effect is most significant at a mass fraction of 10%. At this time, the slump of concrete is reduced by 4.3%, the compressive strength is increased by 6.9%, the tensile strength is increased by 12.8%, and the flexural strength is increased by 11.5%.