Super Air Meter

The Super Air Meter performs a modified version of the typical pressure method (ASTM 231). 

The primary modification is that two sequential pressurizations are applied to the concrete. The deformation of the concrete is first investigated at 14.5, 30, and 45 psi, the pressure is then released, and the same pressure steps are used again to measure the deformation. The differences between the first and second pressure steps are used to calculate the SAM number.

The SAM number has been correlated to the average size and spacing between air voids in the concrete mixture or a value that is known as the spacing factor. If the spacing between the voids is too high then this could mean the concrete is susceptible to freeze-thaw deterioration. A SAM number of 0.20 has been shown to correctly determine over 90% of the time whether the spacing between the bubbles meets the recommendations of the ACI 201 Concrete Durability Committee.

Supplied with reusable brass calibration vessel, safety glasses, mallet, strike off board, tamping rod, filling bulb and plastic protective case.