Experimental study of air lime and hydraulic lime mortar coatings with additives for capillary moisture control in historic buildings.

One of the most common issues in brick masonry walls of Cultural Heritage buildings is the deterioration caused by rising damp through capillarity. Traditionally, these walls have been coated with air lime mortar, but hydraulic lime mortar with additives is now being used to improve drying in cases of capillary moisture. This experimental study aims to identify the behavioral differences between air lime and hydraulic lime coatings with additives in terms of moisture absorption and drying. Tests were conducted on brick and mortar samples coated with both types of mortar. The results showed that the samples treated with hydraulic lime with additives absorbed less water and presented a better visual appearance than those coated with air lime, despite having similar water content. This study contributes to selecting more effective materials for the preservation of historic buildings affected by capillary moisture, improving their durability and aesthetic.