Determination of the Dynamic Modulus of Elasticity of Concrete with Expanded Clay Using Ultrasonic Testing

The use of lightweight concrete with expanded clay has increased as an alternative for reducing the self-weight of structures. Consequently, techniques that facilitate the analysis of the mechanical and elastic properties, such as ultrasonic pulse velocity (UPV), have gained relevance. Despite this, there is still a lack of studies focusing on the elastic properties of this type of concrete through UPV methods, particularly the dynamic modulus of elasticity (Ed) and Poisson's coefficient. This study aimed to determine the Ed and Poisson's coefficient of concrete containing expanded clay, based on the ASTM C597-16 standard and the stiffness matrix method. Strong correlations between static modulus of elasticity (E) and Ed were observed, with exceptions related to the stiffness matrix method. Nevertheless, this method provided the most suitable Poisson's coefficient for the material studied. The Ed values fell within the expected range, confirming the effectiveness of ultrasonic testing for lightweight concrete.