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Navegando por Assunto "Marble and granite"

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    Argamassa autonivelante com adição mineral (fíler) de resíduo de beneficiamento de mármore e granito.
    (Universidade Federal do Pará, 2019-02-04) CHAVES, Patrícia da Silva; PICANÇO, Marcelo de Souza; http://lattes.cnpq.br/4535052395600357
    The process of processing marble and granite rocks generates solid waste along its production chain. These residues have environmental impact potential when not properly managed. The waste produced in the polishing phase of marble and granite slabs can be incorporated into the construction industry as an alternative material for the production of concrete and mortar, contributing to technical performance, economic and environmental viability. In this aspect, this work aims to characterize the marble and granite beneficiation residue (RBMG), in its natural state, and uses it as a self-leveling mortar addition to promote cohesion, similar to the viscosity modifying additive (VMA). For this, a reference mortar was produced, one with addition of RBMG and one with addition of VMA. Where, first, the rheological behavior of the pastes and mortars was analyzed. Then, the mechanical properties, durability and microstructural properties of self-leveling mortars were measured. The results show that the RBMG has no pozzolanic potential. The mortar with RBMG presented optimized mechanical properties and durability in relation to the reference mortar, and similar to the mortar with VMA. The microstructural assay demonstrated that RBMG promoted pore refinement of the cementitious structure, probably due to the granular variation of the particles of the residue, providing greater compactness with the optimization of grain packing. It is concluded that the RBMG can be used as an alternative material to replace the VMA, which is an expensive and difficult to reach product in Belém/PA.
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    Influência do Resíduo Proveniente do Corte de Rochas Ornamentais Mármores e Granitos (RCMG) como substituição parcial ao cimento portland nas Propriedades de Concretos Convencionais.
    (Universidade Federal do Pará, 2018-06-29) ROSÁRIO, Denisson Braun do; PICANÇO, Marcelo de Souza; http://lattes.cnpq.br/4535052395600357; https://orcid.org/0000-0001-7313-1229
    Most of the industrial processes are sources of waste, in the form of gases, liquids or solids, causing, almost always, environmental degradation. The use of waste and industrial byproducts in Civil Construction is an excellent alternative to reduce the environmental impact caused, and greater contribution to sustainable development, considering that Civil Construction is the sector of technological activity that consumes a large volume of natural resources and appears to be one of the most suitable for absorbing solid waste. The residue generated from the processing of rocks (cutting residue of marbles and granites) is the result of the sawing process of blocks of rocks in slabs. In the sawdust, about 20% to 30% of the block is transformed into powder, which in most cases is deposited in corporate yards. In 2008, world rock production totaled about 105 million tons and in Brazil, 7.8 million tons were produced. Of this amount, five million were distributed among marbles, travertines, granites and the like, equivalent to 63% of the total Brazilian production, generating approximately 1.25 million tons of tailings resulting from this processing, that is, 25% marble, and, being the Holy Spirit, Bahia, Ceará and Paraíba the states that generate the greatest volume. In this work the physical, chemical and mineralogical characterization of the marble and granite cutting residue (RCMG) was carried out, as well as the potential evaluation as pozzolanic material. It was also carried out the feasibility of its use in concretes, with partial substitution in contents of 5%, 10% and 15% in relation to the mass of cement. For the concretes produced, the properties of the concrete in the fresh state (workability, consistency) in the hardened state (axial compressive strength, diametral compression tensile strength and flexural tensile strength and modulus of elasticity) were evaluated and durability parameters (absorption by capillary absorption by immersion). The analysis of the results allows to conclude that the cutting residue of marble and graniteVIII presented satisfactory results and has potential to be used within the productive chain of the civil construction.
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