Generally, they supply the necessary slump with less water in the mix, and will supply bigger strength concrete without the need of rising the amount of cement. Silica fume enhances concrete in two approaches The fundamental pozzolanic reaction, in addition to a microfiller outcome. Addition of silica fume improves bonding https://www.tjcyindustrialchem.com/news/cement-additives-and-concrete-admixtures-key-differences.html