Abstract : The U.S. Army Engineer Research and Development Center (ERDC) conducted an evaluation of the Air Void Analyzer (AVA) to determine the machine s ability to accurately and precisely measure the air void structure of freshly prepared portland cement concrete (PCC). This evaluation consisted of producing multiple batches of PCC in the laboratory and measuring each batch s air void structure with the AVA and other commonly used ASTM International testing procedures. A statistical analysis was conducted on sixty batches of concrete, covering a range of entrained air and fly ash contents. Air contents and fly ash replacement ranged from 3 to 8 percent and 0 to 20 percent, respectively. The freezethaw resistance of the PCC produced was also evaluated to verify the machine s ability to reveal poorly performing mixtures. The laboratory evaluation was conducted from May 2011 to January 2012. Laboratory mixtures were batched and concrete specimens were prepared and tested at the ERDC Materials Testing Center. A certified petrographer determined the air void structures were in accordance with ASTM C457. A statistical analysis of the air void structure measurements taken by the AVA was completed using the results of five ASTM International standard test methods. This report summarizes the laboratory performance of the AVA, and the pertinent conclusions from the testing performed. Recommendations for implementation and future testing are provided.