You’re absolutely correct that air entrainment in concrete is a critical factor affecting its durability and workability. Entrained air, when controlled within an optimal range (typically 4-7% for most concrete mixes exposed to freeze-thaw cycles), enhances durability by providing space for water to expand during freezing, reducing cracking and spalling. However, too little air entrainment (below 3%) can compromise this durability, while excessive air can reduce concrete strength…