To guard concrete from problems for the duration of freezing, bubbles will need to have the correct dimension, distribution and quantity. ASTM C 260 specifies necessities for air entraining admixtures. Air Entraining Agents: Introduce air bubbles to the concrete, boosting freeze-thaw resistance and lessening the risk of scaling and cracking. https://webcastlist.com/story21427079/not-known-facts-about-cement-additives