“…However, care must be taken when using correlation curves, as there are several factors that can interfere with the results, such as strength (Silva, 2020), modulus of elasticity (Trtnik et al, 2008;Yıldrım andŞengul, 2011), density (Mohammed andHasan, 2016), porosity (Lafhaj et al, 2006) and permeability (Panzera et al, 2008). In addition, the properties of the water-cement ratio (Ye et al, 2011;Silva, 2020), aggregate size (Berriman et al, 2005), hydration process (Zhang, et al, 2009), and curing conditions chamber et al (2019). In addition to the state of stress that affects the speed of propagation of ultrasonic waves, this phenomenon is called acoustoelasticity (Lillamand et al, 2010).…”