The characterization of the samples collected from the Historical Walls of Carlo V in Syracuse represents a typical example of diagnostic research that helps the recovery of architectural heritage. Different analysis techniques were used during that work in order fo have more
information about the materials, in particular, the mortar.
The analyses of the two samples of the city walls give information about the chemical physical features of the mortar, the type of mortar, and the deterioration process. This phase is important for the knowledge of building before recovery intervention.
