2.3.4. Ultrasonic Pulse Velocity

The ultrasound pulse velocity of concrete specimens from each mix was determined using a portable ultrasonic nondestructive digital indicating tester (PUNDIT), according to (ASTM C597) standard [29], after 28 days of curing, the same practice was adopted by Aziz et al. [30] previously. The setup of equipment for PUNDIT is shown in Figure 5.

**Figure 5.** Ultrasonic pulse velocity test setup.
