It is required to evaluate shear modulus of concrete cube specimen of 100mm size. Since the diameter of DPC transducer is around 84mm, I would like to know whether it can give reliable shear wave velocity result.
If you want to measure sound speed you must use use specimen, that is significantly larger than the wave length. Other ways you will have strong influence of the side walls on your measurement. And your wave length is almost the same as the side length of your cube. But since typically there is no dispersion you can easily use transducers with much higher frequency. I am not sure, if the r wave is not dispersive in concrete, but P and S-wave quite surely no.
I would assume, that you can quite easily use transducers with 500 kHz or even 1 MHz and measure TOF with very high accuracy.
@Wieslaw Bicz Thanks a lot for your response. As concrete is hetrogeneous in nature and possibly consist of aggregates having size around 20mm, it is likely to cause dispersion of the waves if I use transducer with higher frequency/lower wavelength?
If your concrete contains such aggregates you must measure larger pieces or eventually use higher frequencies, closer to 500 kHz. May be 200 or 300 kHz. This will make the measurements more reliable.
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Waves