Table 6.

Previous studies on ultrasonic pulse velocity of lightweight aggregate concrete.

Researcher	Ultrasonic Pulse Velocity	Concrete Quality Based on BS:118-203	Material
Othman et al. (2020) [84]	3.58 km/s to 4.21 km/s	Good	Lightweight Expanded Clay Aggregate (LECA) and Expanded Perlite Aggregate (EPA)
Tanaka et al. (2020) [4]	3.5 km/s to 4.4 km/s	Good	Lightweight artificial aggregate from industrial by-product
Satpathy et al. (2019) [63]	3.42 km/s to 4.51 km/s	Good, 4.51 (Excellent)	Fly ash cenosphere and sintered fly ash aggregate
Abbas et al. (2018) [46]	4.15 km/s to 4.35 km/s	Good	Sintered fly ash aggregate