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Coating mortars have an important role in protecting buildings from degradation agents (FloresColen, 2016). One of the most important in-service degradation agents is water, which can lead to physical, chemical and, in some cases, mechanical deterioration. Thus, the performance of coating mortars is influenced by water capillary absorption, hygroscopic moisture content, water permeability, diffusion of water vapor, porosity, soluble salts content and propensity for the growth of microorganisms. Therefore, is very important to ensure the quality of the applied mortars, as they contribute significantly to the durability of buildings. For this, it is important to use mortars that are compatible with the supports and that will ensure adequate protection to the building. Thus, low water permeability, good water vapor permeability, good adhesion to the substrate, deformation capacity, among others, are sought (Martins, 2008). The influence of different factors on the behavior of mortars, such as the quality of the binder, aggregate particle size, water-binder ratio, application conditions, and dosage, have been extensively studied (Torres, 2014). However, there are still few studies on the influence of the support on mortar characteristics. This work aims to contribute to this knowledge. This research intends to identify how the lightweight concrete block support influences the performance of the applied mortar, considering that the applied mortar is in different conditions than those of mortars hardened in laboratory molds. Thus, the understanding of the characteristics of the applied mortar and the possibility of creating a correlation with the characteristics of the mortar hardened in laboratory molds, may enable a greater compatibility of the mortar with the support and provide data for the optimization of mortar composition. Such understanding may help to increase the in-service durability of mortars.

Influence of Lightweight Concrete Block Support on Physical and Mechanical Characteristics of Applied Mortars