Influência da temperatura e da metodologia de indução na determinação da expansão por umidade em placas cerâmicas para revestimentos.

Abstract

The lack of control in the quality of floor tiles has been reducing the life spend of these products when in use, so we should think about their caracteristics, for example, moisture expansion and the methods to determine and induct it. The present work studied the influence of the temperature in determine the "current" moisture expansion by dilatometrie. I was used autolaved and boiled methods in 1, 2, 4 and 24, 48, 96 hours respectively, we looked for a relationship where the results of the "potential" moisture expansion were equal or very close, to study them.With this purpose , we studied two typer of red floor tiles and two of white one.Which come from Sao Paulo and Ceara States. The white ones come from Cabedelo and Campina Grande in Paraiba.These floor tiles were submited to trail rum chemical analysis, determination of water absorption, resistence to crazing and moisture expansion, according to ABNT. To the results we concluded that there was no influence of the temperature, in determining both "current" moisture expansion and the "potential" one. The results of the "potential" moisture expansion when autoclaved during 1 hour were close to the ones got by boile in 96 hours and the results to 1 and 4 hours to the autolaved method were almost two times the results of the expansions that used the boil ethod in 24 and 48 hours respectively. So it displocement of the floor pices.