In this paper, the Elastodynamic Finite Integration Technique (EFIT) is used to investigate the propagation of ultrasonic waves in two-dimensional synthetic concrete models including cement porosity.
With the help of the EFIT-PS/PR technique, described in former papers, the effect of porosity on the frequency dependent attenuation and dispersion of longitudinal and shear waves is demonstrated.
The most important physical phenomenon is the resonant scattering of the particles in the effective medium. The results show that the particle resonances in a porous concrete model are more significant than in a model without pores.
Pulse-echo and impact-echo simulations reveal the dominant effect of cement porosity on the applicability of ultrasonic NDT methods in concrete.