The proposed test method standard will establish best practices for measurement of a dominant resonant mode of a concrete specimen using an acoustic impulse response. The purpose is to qualify a specimen for such measurement, i.e., identify a strike location and support conditions that will repeatably produce a dominant resonant mode that depends primarily on material properties of the specimen. Variation of such measurements is related to variation of elastic properties such as elastic modulus. Similarly, variation of such measurements is related to variation in compressive strength. While this test method focusses on measuring a dominant resonant frequency in the acoustic response to an impulsive stimulus, other useful attributes can also be derived from the acoustic impulse response. While the underlying principles of operation of the proposed test method are similar to what is described in ASTM C215, there are substantial differences.
NDT; non-destructive testing; concrete compressive strength; Impulse Excitation; Modal Analysis; Acoustic Impulse Response Resonance; AIRR; Prism; Cylinder.
Data gathered through this test method can be used to produce estimates of compressive strength that are comparable to results from compression testing of CMUs and related units as described in ASTM C140/C140M. Similarly, data gathered through this test method can be used to produce estimates of compressive strength that are comparable to results from compression testing of Cylinders as described in ASTM C39. It is quick and easy to perform, and it facilitates qualification of various shapes and sizes of concrete specimens for non-destructive testing using acoustics.
The title and scope are in draft form and are under development within this