Análise de resistência de aderência de placas cerâmicas em placas cimentícias e OSB

Abstract

Given the large housing deficit in Brazil, the search for new efficient and cheaper materials is crucial to reduce this housing shortage. Therefore, in this work, tests were carried out to check the adherence of ceramic plates on different substrates: the cementitious board and the OSB. These two substrates can be used as wall closures or dry slabs closing in the wood-frame and steel-frame construction technologies. It is worth mentioning that, these construction methods are more ecological, known as dry constructions, do not use a large amount of water, and the production of rubble is less when compared to more trivial methods. The analysis was carried out in accordance with NBR 14081-4 (ASSOCIAÇÃO ..., 2012), which standardizes the testing of ceramic tile placement. In the Brazilian norm, the standard substrate used is the concrete slab, as the purpose of the work is to evaluate other substrates, the OSB and the cementitious board were used, and in the end the performance between them was compared. For execution, a double-sided drywall prototype wall was developed, with dimensions of 63.8 cm in width, and 120 cm in height, and the OSB and the cementitious board were fixed on its two largest faces. After that, the area for laying ceramic tiles was demarcated and laid with mortars of types AC I and AC II. After the curing time of 28 days, the plastering of the ceramics was carried out with the assistance of a traction machine. The results of the tests were processed and measured, it is concluded that the adhesion resistance of the ceramic tile with the cementitious tile substrate is unsatisfactory, since the two types of mortar obtained resistance less than 10% of the minimum required by the ABNT, in this substrate, the mortar AC II, had a slight advantage in the necessary pulling force. As for OSB substrate, the adhesion resistance was equal to zero in all tests with all mortars. One hypothesis for this result was the interference of phenolic adhesives used in the manufacture of OSB, in the anchoring of the ceramic plate.