Durability of Concrete and Refractories
The determination of flexural resonance is very important when studying the degradation of concrete under accelerated freezing and thawing cycles and aggressive environments on concrete specimens as well as thermal cycling of refractory materials. The advantage of resonance methods are:

1. Tests can be repeated over a very long period on the same specimen; the number of test specimens required is therefore greatly reduced.
2. The results obtained with the flexural resonance method on the same specimen are more reproducible than those obtained with destructive tests and groups of specimens.

The E-Meter™, in addition to conforming to ASTM C-215 for determining resonant frequency can be adapted for –