Spectral Analysis for Definition Samples’ Quality with Elastic Properties

Testing methods for measuring the properties of a fresh concrete are of special interest because it is possible, on the basis of its results, to predict the properties of concrete prior to its placement. The presented method is based on the ultrasonic shear waves reflection from the upper layer of the hardening cement paste. The acoustic attenuation, of the normal incidence and the reflected waves, correlates with the shear modulus of elasticity and the viscosity