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.

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