The Super Air Meter (SAM) is a testing device that measures both the air void spacing and air volume of plastic (fresh) concrete in about 10 minutes. Air void spacing has been shown to be a better indicator of concrete freeze-thaw durability than total air content; however, until now, it has been challenging to measure in fresh concrete. By being able to measure the actual air-void spacing in the fresh concrete, the meter helps users better understand the freeze-thaw durability of their concrete before it is placed.
We are currently working with the FHWA mobile concrete lab and the group at Turner Fairbanks to verify the meter. There is also a pooled fund project to further investigate the device. You can find more information here.