Study of the consolidation process of adhesive mortars through oscillatory rheometry

Resumo

The study proposed in this paper aims to evaluate the consolidation process of polymeric mortars used for laying ceramic tiles, using the oscillatory rheometry technique. Based on the shear stress generated by the application of a preset deformation and a relationship between the components of the complex deformation modulus, G' and G'', we sought to understand the changes in behavior that occurred in these mortars over a period of time in which a significant part of the chemical reactions of cement hydration are expected to occur. Such reactions trigger a series of physical transformations that can be better understood from a rheological profile. What can be seen from the data analysis is that oscillatory rheometry is a tool capable of forming the rheological profile of cementitious materials over a period of time in which the quantities involved are constantly changing. The mixtures used in the study were made from the same set of materials with different compositions in terms of the proportions between them. The analysis showed that oscillatory rheometry has sufficient sensitivity to detect the physical transformations that took place during the chosen period and that the variations in the composition of the samples were detected by the technique used, within the spectrum defined in the design of experiments.