What is the effect of an excessive increase in entrained air?

An excessive increase in entrained air within a concrete mix can indeed weaken the concrete mix. Entrained air is intentionally added to improve the workability and durability of concrete, especially in freeze-thaw environments. However, when the amount of entrained air exceeds the recommended levels, it can lead to several issues.

Increased air voids can create a less dense concrete structure, resulting in reduced compressive strength and overall integrity. This porosity makes the concrete more susceptible to permeation by water and chemicals, which can further lead to deterioration and reduction in the material's load-bearing capacity. Essentially, while a controlled amount of entrained air enhances performance, an excess alters the mix's properties negatively, therefore compromising the concrete's strength and durability.