Tomography is a powerful NDT technique whose application for the diagnosis of the state of conservation of masonry historical buildings is increasing although it is not widespread yet. There is a number of reasons that are delaying the diffusion of this technique. The state-of-the-art of the equipment that is available for tomographic experiments is still below the expectations for both radar and sonic. The cost of tomographic experiments is high because they require rather long times for acquisitions and comparable times for data processing. Besides, expert operators are also needed for both the acquisitions and the data processing. Because of these costs, the correct approach to sonic and radar tomographies is to apply these methods for local accurate inspections of structural elements after a more extensive application of other cheaper NDT methods. The contributions that we can expect from these techniques are the definition of the internal structure of a masonry, the detection of any internal inhomogeneity in the size range of the experiment resolution, the assessment of the elastic properties of the masonry, the detection of weak or fractured areas, the mapping of moisture distribution, the evaluation of grout injection effects.
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