Pumping Aids: Greatly enhance the pumpability of concrete, cutting down the potential risk of segregation and blockages all through placement. Silica fume increases concrete in two ways the basic pozzolanic reaction, as well as a microfiller influence. Addition of silica fume increases bonding throughout the concrete and helps decrease permeability, https://www.tjcyindustrialchem.com/news/cement-additives-and-concrete-admixtures-key-differences.html