Estudo da combinação de resíduo de scheelita, pó de pedra e manipueira com aglomerantes para produção de tijolos ecológicos
The high quantity of residues from mineral and vegetal extraction, which cause serious environmental impacts when improperly deposited, can be widely used by the construction industry, one of the largest consumers of the planet's natural resources, promoting a circular economy. Several resea...
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| Formato: | doctoralThesis |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/31917 |
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| Resumo: | The high quantity of residues from mineral and vegetal extraction, which cause serious
environmental impacts when improperly deposited, can be widely used by the
construction industry, one of the largest consumers of the planet's natural resources,
promoting a circular economy. Several researches have been carried out with the use
of residues in construction materials, with emphasis on the soil-cement brick, also
called ecological brick. Carrying out a systematic research, it was verified the use of
scheelite residue and stone powder in construction materials, which generate large
quantities in the State of Rio Grande do Norte. In place of the hydration water, cassava
wastewater, the liquid waste from the process of processing cassava for the production
of flour, has been used. Aiming at an ecological brick, for use in society that replaces
soil and water for waste, is developed this study of scheelite residue, stone powder
and cassava wastewater combination with the addition of binders. The physical,
chemical and mineralogical characterization of the materials was carried out. Then the
compaction test was carried out to evaluate the best combination of the solid waste
mixture, being determined in 50% of each residue. Technological essays were carried
out on cylindrical specimens with addition of cement and / or lime hydrated with water,
obtaining satisfactory results for cement formulations. These cement formulations were
used in the production of bricks, with the addition of cassava wastewater, replacing
water, by 11% in relation to the total mass of solid waste. The technological essays of
the bricks showed satisfactory results, justified by the high packaging between the
residues and properties of the cassava wastewater, being observed cement phases in
the analysis of Scanning Electron Microscopy and X-Ray Diffraction. The ecological
brick is promising for use as sealing masonry, being able to be competitive in the
market due to the low cost and easy availability of the wastes, highlighting the
formulation with 9% addition of cement to the waste mixture. |
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