Comparison of Compressive Strength of M30 Grade Concrete with Destructive and Nondestructive Procedures Using Digital Image Processing as a Technique

Table 1

Classification of concrete by the ultrasonic pulse velocity test [28].

Range of ultrasonic pulse velocity results (km/s)	Classification of concrete
>4.5	Excellent
3.5–4.5	Good
3.0–3.5	Medium
<3.0	Doubtful