Desenvolvimento de método para medida de permeabilidade superficial de revestimentos de argamassa. / Development of method for measuring the surface permeability of coating mortar.

AUTOR(ES)

Daniel Tourinho Sentone

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

25/05/2011

RESUMO

The phenomenon of permeability refers to the ability with which a fluid is transported through a porous medium, driven by pressure gradient between the material and the external environment. Degradation agents are conducted to the interior of mortar and concrete driven through such a phenomenon. Therefore, it is the permeability as a key parameters for durability and shelf life of cementitious materials. Moreover, as this type of evaluation is related to structural conditions of the empty capillary porous media, this type of measurement can provide an indication of the conditions of the porous structure of mortar at the time of trial, still serving as a method of quality control and evaluation production processes. Therefore, a new procedure for measuring air permeability in transient flow regime was developed for evaluation of mortar coating by the method of vacuum-decay. The potential of the process is not restricted only to the determination of the classical parameters of permeability proposed by Henry Darcy, but in assessing the recovery curve of pressure that provide a clear picture of states in different microstructural conditions of the structure of porous media. Moreover, it is a portable test, nondestructive and low cost of implementation for evaluation of mortar coating in situ. For this reason, this study evaluated different formulations of mortar coating in laboratory environment and in situ, compared to the Cembureau method (reference), and if there is a relationship between two different conditions presented. The depth reached by this type of test surface is a recurring question of this and other tests of the same nature, and so was considered in developing of this experimental plan. Still, the different directions of air flow during the measurement can influence the determination of permeability for different configurations of the experiments, and were also considered in developing the method.

ASSUNTO(S)

argamassas microestrutura microstructure mortars permeabilidade permeability vaccum-decay vacuum-decay

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