To protect concrete from hurt during freezing, bubbles have to have the proper dimension, distribution and quantity. ASTM C 260 specifies requirements for air entraining admixtures. Depending on our working experience in cement creation process and products know-how, one or two SikaGrind® goods are advised for plant trials. If needed, https://www.tjcyindustrialchem.com/news/cement-additives-and-concrete-admixtures-key-differences.html