Physical and mechanical characterization of a commercial rendering mortar using destructive and non-destructive techniques

A commercial masonry rendering mortar is tested in this study of the classical correlation between structure and mechanical properties. Porosity, capillary absorption of water and mortar shrinkage are all analyzed. Special emphasis is placed on the development of mortar strength, stiffness, and damping characteristics including sound muffling. All these properties are related to the microstructure of the mortar in the hardened state and to its moisture content. The numerical results showed different values for the Young's moduli of the rendering mortar under both tension and compression, and an outstanding capacity to dissipate vibrational energy. Freeze-thaw and wetting-drying durability tests were also performed on the mortar with good results.