Compósito para material de construção civil a partir de resíduo de tratamento de minério de ferro, de concreto e de produção da cal
The industry has a growing need to minimize or otherwise reuse the waste generated in production processes. This not only directly influences on the reduction of costs of waste treatment and disposal but also helps to preserve the environment.The main objective of this research was to use iron ore t...
| Autor principal: | Povaluk, Ana Ester |
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| Formato: | Dissertação |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2021
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/25582 |
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| Resumo: |
The industry has a growing need to minimize or otherwise reuse the waste generated in production processes. This not only directly influences on the reduction of costs of waste treatment and disposal but also helps to preserve the environment.The main objective of this research was to use iron ore tailings ( IOT), from the collapsed Fundão dam in Mariana – MG, lime production waste (LPW) and also concrete residue (CR), to generate a new composite for civil construction with concrete characteristics, and evaluate changes in mechanical properties and morphological structures of specimens during curing periods of: 3, 7, 14, 28, 60, 90, 180 and 365 days. Through the methods of XRD XRF, SEM with EDS, the physicochemical interactions of the components of the mixtures were determined. With the characterized residues, 16 composites were developed, varying the content of the raw materials, distributed between 30% and 60% of IOT and CR and contents between 10 and 25% of LPW, totaling 960 specimens which were subjected to simple uniaxial compressive strength tests, water absorption, linear shrinkage, density, chemical, mineralogical, morphological analysis, leaching and solubilization tests, and laser micro-mass analysis. During curing, an increase in the values of compressive strength was observed, which occurs due to the neutralization and dissolution of surfaces now with low alkalinity, causing the synthesis of new amorphous and crystalline formations. Among all the compositions developed, there is the number twelve, which obtained uniaxial compressive strength of 2.52 MPa at 28 days and 7.07 MPa at 365 days of cure, which was subjected to analysis of chemical physical processes of formation of new structures through the set of methods XRD, SEM EDS and mapping. The environmental properties were studied through leaching and solubilization tests, laser micro-mass analysis – LAMMA. The values of the experimental tests for leaching and solubility of heavy metals were significantly lower than those allowed by Brazilian standards, demonstrating the effective mechanical bonding of particles, which also means the effective chemical bonding of atoms and ions in new chemically stable formations. The results of this dissertation attest that these residues when made into a composite and used in civil construction materials, contribute to the reduction of the extraction of natural resources, in addition to providing a correct destination for the large volume disposed, which offer serious hazard to the environment. |
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