Estudo de caso de revestimento argamassado externo aplicado sobre alvenaria convencional

Abstract

The damage found on facades are mainly related to the adhesion of external mortar coatings to the substrate. In this sense, it is increasingly common for companies to perform the tensile bond strength test, regulated by NBR 13528 (ABNT, 2019). Several factors influence this property, such as the type and preparation of the base, curing execution, position of the facade, and method of execution. In order to characterize these factors, the tests performed on 8 facades of a multi-storey residential development in Goiânia-GO were analyzed taking into account the average strength values and their forms of rupture. Most (80%) of the tests were approved according to the limits established by NBR 13479 (ABNT, 2013). The failed facades were in the same solar orientation, north The failed facades were in the same solar orientation, north, correlating the adherence to temperature and insolation. Through the type of rupture it was evidenced the lack of curing of the roughcast and rendering. Failures in the execution of the tests that may have compromised the results are discussed.