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Saint-Léonard-de-Noblat, France

Do D.-P.,Laboratory PRISME | Baba N.,Laboratory PRISME | Hoxha D.,Laboratory PRISME | Bui T.-S.,Ha Noi University of Mining and Geology
Journal of Physics: Conference Series | Year: 2015

Damage assessment of cement-based geomaterials during loading was conducted in this work by using the through-transmission ultrasound. For this purpose a built up system of ultrasound consisting of 96 channels and the specific sensors allowing to measure at the same time three types of waves (a bulk wave and two shear waves) were used. The continuous measurements enable to assess the damage of material through the constructed image of ultrasonic velocity as well as the attenuation of each wave during loading. The difference tomography method using the differential arrival times or relative amplitudes with respect to the initial stage confirms its efficacy through this work. The results show that all three types of wave can be used to capture the progressive damage in material but the bulk wave seems to be more sensitive than the shear waves. Source


Do D.-P.,Laboratory PRISME | Hoxha D.,Laboratory PRISME | Bui T.-S.,Laboratory PRISME
Journal of Applied Mechanics, Transactions ASME | Year: 2015

This work aims at assessing the mechanical properties of interphase in a compositelike geomaterial by using a nondestructive characterization technique by ultrasound and an inversion procedure based on the theoretical multi-inclusion model. This latter model is extended here and adapted for the multiphase heterogeneous materials which may contain an arbitrary number of interphases between each inhomogeneity and matrix phase. Some numerical applications on a cement-based geomaterial show that this procedure can be used as a complementary method to characterize the properties of interphase. © 2015 by ASME. Source

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