To guard concrete from harm during freezing, bubbles must have the appropriate measurement, distribution and volume. ASTM C 260 specifies requirements for air entraining admixtures. Concrete admixtures are normal or made chemical substances or additives extra through concrete mixing to improve unique properties from the new or hardened concrete, including https://www.tjcyindustrialchem.com/news/cement-additives-and-concrete-admixtures-key-differences.html