Air Void Analyser
The AVA-3000 is used to measure the size distribution of voids and the air-void parameters of the fresh concrete.
A mortar sample of the air entrained concrete is obtained from the fresh concrete with a sampling tool and injected into the blue AVA release liquid at the bottom of a riser column with water above.
The mortar sample is stirred gently into the release liquid by which the air bubbles are released and start rising through the water following the Stoke´s Law: Larger bubbles will rise faster than smaller bubbles. At the top of the riser column a buoyancy pan attached to a balance measures the change in the pan´s weight caused by the rise of the air bubbles. Those changes are continuously collected over the test, when it ends, the information in analysed and the size distribution of the bubbles is obtained.
- For rapid quality control and quality assurance testing in-situ of freeze-thaw resistant concrete
- For research purposes where knowing the size distribution of the entrapped air bubbles is relevant
- For establishing relationships to durability determined by freeze-thaw tests, ASTM C666-15