ABSTRACT
This chapter presents the results of non-destructive testing of stone masonry walls performed by the method of seismic refraction and georadar. Masonry compactness ratio was analysed for qualitative assessment of stone masonry. Geophysical investigation was performed by using several non-destructive and minor destructive methods which enabled a more reliable assessment of the existing condition of the tower masonry wall. With many unknown parameters of the existing historic structure, a thorough investigation and assessment provides a basis for minimum intervention, use of compatible materials and respect of all aspects of the restauration of the historic structure. The masonry compactness ratio (MCR) is introduced in order establish qualitative classification of masonry compactness. Non-destructive investigation should also be performed after the intervention in order to compare the initial and final MCR and draw conclusions about the effect of the grouting.
