Estudo do fissuramento do vidrado de azulejos em serviço.

Abstract

Frequently the ceramic tiles show a crazing glazed surface. Trying to avoid this problem, after fabrication, the tiles are submitted to some tests of quality control specified by ABNT. However, it has been observed that these tiles have a suitable behaviour during the quality control, but after to be fixed on the wall exhibit the development of crazing. Objecting to acquire a great knowledge over this problem, since 1974 have being studied national tiles from different manufactois. The tiles were fixed on the wall in form of panels with mortar and mortar with organic adhesive at various ratio and thickness. At 1977 were selected samples of fixed tiles and from then on several data of crazing, bending and adhesion failure have being collected. So, this research presents a general study based on the results obtained till now. The results show that the use of organic adhesive reduces crazing on the glazed surface of the tiles when in service, that the crazing of the glazed surface has a certain interdependence between bending, adhesion failure and evolution of time fixing, that the panels with less thickness mortar and weaker traces are the ones with best behaviour after 14 years fixing.