Title: Concrete Q&A: Synthetic Air-Entraining Admixtures and Air Content Requirements/Recommendations
Author(s): Michael A. Caldarone, Lawrence R. Roberts, and Emmanuel K. Attiogbe
Publication: Concrete International
Appears on pages(s): 71-72
Q. I recently conducted an extensive review of concrete industry standards for requirements and recommendations for air contents specified for freezing-and-thawing durability. Unfortunately, my review shows that the requirements/recommendations included in ACI documents and ASTM standards do not reflect the use of synthetic air-entraining admixtures (AEAs). Rather, these requirements/recommendations are based on concrete mixtures prepared using neutralized vinsol resin AEA, which creates a different air-void system than synthetic AEAs. How can I adjust air content requirements in my specifications to accommodate the use of synthetic AEAs and still meet the requirements/recommendations included in ACI and ASTM documents?