ALMEIDA, Brunna Lima de.; MEDEIROS, Brunna Lima de Almeida Victor.; MEDEIROS, B. L. A. V.; http://lattes.cnpq.br/9966295997259863; MEDEIROS, Brunna Lima de Almeida Victor.
Resumen:
The generation of waste in the industrial sector is a problem that has been followed by
the economic growth of the sector. Presenting solutions and alternatives that minimize
the environmental impact caused by the incorrect way of disposal of these wastes has
been increasingly a concern of the producers. Through research on non-conventional
materials, the construction industry has been able to absorb this demand for
sustainable alternatives. This research had as objective to analyze the mechanical
properties and durability of coating mortar produced with the incorporation of residues
from the Scheelite beneficiation industry. In order to identify the potentials for the use
of alternative raw materials, this residue was characterized by the following techniques:
granulometry, specific and unit mass, X-ray diffraction, thermogravimetry, X-ray
fluorescence chemical analysis and spectrometry by absorption. After the
characterization tests, compositions were defined and, with the best results of
mechanical performance of these compositions, were determined the following
properties: water absorption, traction adhesion potential, durability by wet and dry
cycles method. The alkali-aggregate reaction was investigated by the bar expansion
test by the accelerated method and through analysis of images obtained by scanning
electron microscopy (SEM) and by dispersive energy spectroscopy (EDS). In the
results of the bar expansion test, expansions were identified that indicated residue
reactivity. The images obtained by MEV and EDS did not reveal the presence of
formation of any deleterious gel, but they showed the occurrence of cracks that
corroborate with the results obtained in the expansion test. The absence of the gel
suggests an alkali-carbonate reaction due to the strong presence of calcite in the
samples. Thus, it was possible to conclude that the residue can presents reactivity with
the cement components and can be used as a substitute for normal sand in the
production of coating mortar, provided that the cement used in the mortar can inhibit
these reactions.