Abstract:
Non-destructive or micro-destructive in situ tests are very relevant to the physical characterization of materials used in historical buildings. “Controlled penetration,” “sphere shock,” and “sonic methods” can be used to evaluate the mechanical resistance of mortars and renders or to monitor the evolution of the surfaces after their application. Used to evaluate surface hardness, micro-drilling (DRMS) is a very sensitive technique, and its use in this field is expected to contribute more precise results. The diversity of the composition of the mortars and the systematic presence of abrasive components are limiting factors for the use of this method in this field. In this study, several mortars with different composition and hardness are compared, using drilling resistance as the comparative parameter. The mortars were applied on-site, aiming at their use in real situations, and some samples were tested in the laboratory using conventional techniques that were complemented by additional methods currently used for on-site characterization of materials. The results also highlight the need for an integrated perspective of laboratory and on-site information
