To guard concrete from damage through freezing, bubbles should have the appropriate dimension, distribution and quantity. ASTM C 260 specifies prerequisites for air entraining admixtures. Silica fume enhances concrete in two strategies The fundamental pozzolanic response, plus a microfiller effect. Addition of silica fume increases bonding throughout the concrete and https://www.tjcyindustrialchem.com/news/cement-additives-and-concrete-admixtures-key-differences.html