To what standard must air entrainment admixtures conform?

Air entrainment admixtures are specifically designed to introduce air bubbles into concrete to enhance its durability and resistance to freeze-thaw cycles. The standard that governs the specifications and testing for these admixtures is ASTM C260. This standard outlines the requirements for air-entraining agents used in concrete, including their composition, effectiveness in providing air-void systems, and performance in ensuring the concrete’s resilience under various environmental conditions.

By conforming to ASTM C260, air entrainment admixtures contribute to the overall quality and longevity of concrete by ensuring that the proper amount of air is incorporated into the mix, which helps in reducing the risk of damage from freezing and thawing processes. The other standards listed pertain to different aspects of concrete and its components but do not specifically address air entraining admixtures. For instance, ASTM C94 focuses on ready-mixed concrete, while ASTM C1582 pertains to the use of corrosion-inhibiting admixtures in concrete. ASTM C39, on the other hand, deals with the test methods for compressive strength of cylindrical concrete specimens. Thus, ASTM C260 is the relevant standard for air entrainment admixtures.