To safeguard concrete from destruction during freezing, bubbles will need to have the proper sizing, distribution and quantity. ASTM C 260 specifies necessities for air entraining admixtures. a) Lately�?considerable initiatives have been created by the cement field entire world wide to lessen energy intake in the manufacture of Portland cement. https://www.tjcyindustrialchem.com/news/cement-additives-and-concrete-admixtures-key-differences.html