2.2.5. Ultrasound Pulse Velocity (USPV)

USPV is another common non-destructive index. The structural compactness in the specimen can be estimated according to the ultrasonic transferring rate (i.e., the speed of ultrasound waves going through the sample). The more complete the hydration reaction inside the concrete, the smaller the pores will be; thus, the detected USPV increases. ASTM C597 details the method(s) to test USPV [33].
