Argamassas produzidas a partir da substituição do agregado miúdo pelo resíduo do beneficiamento da scheelita e da água de hidratação por manipueira
Mortars are homogeneous mixtures between fine aggregate, binder and water, being one of the materials most consumed by the construction industry, presenting main uses in masonry laying and coating. Aggregates account for 60 to 80% of material consumption in ready-mixed mortars, in addition to hig...
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Format: | Dissertação |
Sprache: | pt_BR |
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Online Zugang: | https://repositorio.ufrn.br/jspui/handle/123456789/28289 |
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Zusammenfassung: | Mortars are homogeneous mixtures between fine aggregate, binder and water,
being one of the materials most consumed by the construction industry,
presenting main uses in masonry laying and coating. Aggregates account for 60
to 80% of material consumption in ready-mixed mortars, in addition to high
consumption of treated water. In this sense, research has been developed to
replace the constituent materials with residues that contribute to the properties of
the mortars, reduce the consumption of the finite natural resources and present
a destination for the residues. In this scenario the Rio Grande do Norte (RN)
presents high levels of commercialization of minerals, such as tungsten that is
found in the ore of scheelite. In Brazil, the main scheelite ore deposits are located
in the Província Scheelitífera do Seridó. The process of beneficiation of the
scheelite produces about 18,000m3 of waste/year (fine and coarse). On the other
hand, the cassava processing process (Manihot esculenta Crantz) also produces
some residues, such as cassava wastewater, a milky-looking liquid that flows
from the roots of cassava during the pressing process to obtain starch or for the
production of flour. This liquid has high content of hydrocyanic acid and high
biochemical oxygen demand (BOD). Brazil is the fourth largest producer of
manioc (21.08 million tons) and it is estimated the production of cassava
wastewater in the proportion of 3: 1, in which for every 3 kg of manioc roots
pressed, 1 liter of cassava wastewater. Both residues lack technology for their
use and reduction of environmental impacts, such as visual degradation of
landscape, soil, relief, air pollution and groundwater contamination. In this way, mortars for bricklaying will be analyzed with replacement of the fine aggregate by
residue of scheelite (fine and coarse) and water of hydration by cassava
wastewater. The residues and materials will be characterized for use in mortar in
the proportion of 1: 3 (cement: aggregate) and 1: 1: 6 (cement: lime: aggregate),
in volume. Afterwards, mortars will be analyzed for their freshness properties
(consistency, mass density, entrained air content and water retention) and
hardened (tensile strength, compression, immersion absorption, capillary
absorption, bulk density and dynamic modulus of elasticity), as well as MEV
analyzes to verify its technical feasibility of substitution. The expected results are
the obtaining of properties, using the residues, with values within those expected
for use as mortar for bricklaying. |
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