Does benefitiated ash really eliminate the potential for air problems?
While beneficiated ash done with the Proash process is one of the most consistent components in the concrete mixture it cannot eliminate all air entrainment variables. The largest potential air concern involving fly ash prior to ProAsh was from precipitator managed ash fluctuations in LOI. Load to load variation left load to load variables for the concrete producer to manage. There are however many other variables involving air entrainment in concrete using fly ash. They can range in scope from the type of air entrainment used to the fine to coarse aggregate ratio in the mixture, to the FM of the fine aggregate, the SE in the coarse aggregate, ambient temperature, even to the type of other chemical admixtures used or even the sequence of loading and mixing of the concrete.
