DIAS, R. T. V.; http://lattes.cnpq.br/9505866414116804; DIAS, Renata Tomaz Vieira.
Abstract:
In the state of Paraíba there is a significant concentration of the
vermiculite mineral that, through its extraction, generates raw materials for civil
construction. During its processing, tons of waste are generated and deposited in the
environment in an inadequate way, causing great environmental impacts. The objective
of this work was to analyze the feasibility of the use of the vermiculite residue in
substitution for the portion of natural fine sand in the elaboration of coating mortars
with improved properties. Samples of vermiculite residue were collected at Pedra
Lavrada, Santa Luzia / PB, to perform characterization tests, in order to evaluate their
application in mortars. Mortars with 1: 4 traces (cement: sand) were prepared, with
substitution contents of 0%, 30%, 60% and 100% fine sand. Portland cement CP II-Z
32, with water / cement factor between 0.65 and 0.85, was used. The mortars were
analyzed in the hardened state through the tests of resistance to compression, immersion
absorption and capillarity. Considering the best result found, plates were prepared for
the thermal behavior test. The characterization of the vermiculite residue showed a great
amount of fines, which led to an improvement in the compressive strength, water
absorption by immersion and capillarity in the mortar, when compared to the reference
mortar (0%). The results of the thermal behavior analysis, obtained by means of the
thermal gradient between the faces of the plates, showed a variation in the thermal
gradient of up to 40% higher for the plates containing vermiculite residue when
compared to the results obtained in the reference mortar (0% ). Thus, it is possible to
conclude that the vermiculite residue is suitable for the production of coating mortar and
guarantees improved properties, mainly in terms of its thermal behavior compared to the
reference mortar.
