Evaluation of mechanical properties of gypsum with the incorporation of the products of coal combustion.

Detalhes bibliográficos
Autor(a) principal: Francisco Necy Alves JÃnior
Data de Publicação: 2015
Tipo de documento: Dissertação
Idioma: por
Título da fonte: Biblioteca Digital de Teses e Dissertações da UFC
Texto Completo: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15321
Resumo: The accelerated industrial development of recent decades has been touted as one of the most impacting factors on the environmental imbalance. For this reason, research has been developed aiming, among other objectives, the reuse of waste generated by industrial processes as raw materials or inputs in other processes. This study aims to investigate the viability of using waste generated by the combustion of coal in power plants as an additive in the production of gypsum parts for construction. Coal combustion products (CCP) are already being applied in the construction industry as an additive in concrete, but their use in gypsum masses is very limited, which motivated the current reseach project. Initially the influence of water by varying the addition on mass in 5 levels between 10 and 50% was evaluated in order choose the best ratio water / gypsum about the mechanical properties. The materials used were characterized by fluorescence spectroscopy X-ray (XRF), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and energy dispersive X-ray (EDS) and scanning electron microscopy (SEM). The production process used for making the specimens was the so-called UCOS (portuguese acronym for the initials of wetting, compaction and drying), with pressure of 10 MPa. Then, test pieces were prepared with incorporation of PCC to the mass of gypsum in 5 levels between 10 and 50% to analyze the influence of these additions on mechanical properties, which was evaluated by compression tests, hardness and three point bending. The results determined that the water/gypsum (a/g) that provides the best mechanical properties is 0.2, which is used in the evaluation stage of the specimens with addition of PCC. It was concluded that, in general, increasing the incorporation of the waste was damaging to the mechanical properties of the gypsum block. Nonetheless, the studied conditions meet the requirements of NBR 13207, except for the condition with incorporation of 50% of PCC. In general, the mechanical properties behaved in similarly conditions between 10 and 20% of PCC, but the evolution from 20 to 30% caused a significant decrease in the results. Thus, it is concluded that the condition of 20% PCC in plaster and ratio a/g 0,2 meets the standard, ensures recycling of waste and, due to the pressing process, has better mechanical strength compared to the usual products.
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spelling info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisEvaluation of mechanical properties of gypsum with the incorporation of the products of coal combustion.AvaliaÃÃo das propriedades mecÃnicas do gesso com incorporaÃÃo dos produtos da combustÃo do carvÃo.2015-09-18Ricardo EmÃlio Ferreira Quevedo Nogueira20333560353http://lattes.cnpq.br/6064127323404237Ãnio Pontes de Deus24220396349Candido Jorge de Sousa Lobo80231209304http://lattes.cnpq.br/931430589004946166897793353http://lattes.cnpq.br/2140077148537768Francisco Necy Alves JÃniorUniversidade Federal do CearÃPrograma de PÃs-GraduaÃÃo em Engenharia e CiÃncia de MateriaisUFCBRGesso MecÃnica - ResistÃncia Gypsum PCC Mechanical resistanceENGENHARIA DE MATERIAIS E METALURGICAThe accelerated industrial development of recent decades has been touted as one of the most impacting factors on the environmental imbalance. For this reason, research has been developed aiming, among other objectives, the reuse of waste generated by industrial processes as raw materials or inputs in other processes. This study aims to investigate the viability of using waste generated by the combustion of coal in power plants as an additive in the production of gypsum parts for construction. Coal combustion products (CCP) are already being applied in the construction industry as an additive in concrete, but their use in gypsum masses is very limited, which motivated the current reseach project. Initially the influence of water by varying the addition on mass in 5 levels between 10 and 50% was evaluated in order choose the best ratio water / gypsum about the mechanical properties. The materials used were characterized by fluorescence spectroscopy X-ray (XRF), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and energy dispersive X-ray (EDS) and scanning electron microscopy (SEM). The production process used for making the specimens was the so-called UCOS (portuguese acronym for the initials of wetting, compaction and drying), with pressure of 10 MPa. Then, test pieces were prepared with incorporation of PCC to the mass of gypsum in 5 levels between 10 and 50% to analyze the influence of these additions on mechanical properties, which was evaluated by compression tests, hardness and three point bending. The results determined that the water/gypsum (a/g) that provides the best mechanical properties is 0.2, which is used in the evaluation stage of the specimens with addition of PCC. It was concluded that, in general, increasing the incorporation of the waste was damaging to the mechanical properties of the gypsum block. Nonetheless, the studied conditions meet the requirements of NBR 13207, except for the condition with incorporation of 50% of PCC. In general, the mechanical properties behaved in similarly conditions between 10 and 20% of PCC, but the evolution from 20 to 30% caused a significant decrease in the results. Thus, it is concluded that the condition of 20% PCC in plaster and ratio a/g 0,2 meets the standard, ensures recycling of waste and, due to the pressing process, has better mechanical strength compared to the usual products.O acelerado desenvolvimento industrial das ultimas dÃcadas tem sido apontado como um dos fatores mais impactantes sobre o desequilÃbrio ambiental. Por esse motivo, pesquisas vÃm sendo desenvolvidas visando o reaproveitamento dos resÃduos gerados pelos processos produtivos industriais como matÃrias-primas ou insumos em outros processos. Este trabalho objetiva investigar a viabilidade de se utilizar um resÃduo gerado pela combustÃo de carvÃo mineral em usinas termoelÃtricas como aditivo na produÃÃo de peÃas de gesso para a construÃÃo civil. Este produto da combustÃo de carvÃo (PCC) jà vem sendo aplicado nas indÃstrias de construÃÃo civil como aditivo em cimento, porÃm sua utilizaÃÃo em massas de gesso à bastante restrita. Inicialmente foi avaliada a influÃncia da Ãgua pela variaÃÃo da sua adiÃÃo à massa de gesso em 5 nÃveis entre 10 e 50%, visando escolha da melhor relaÃÃo Ãgua/gesso quanto Ãs propriedades mecÃnicas. Os materiais utilizados foram caracterizados por espectroscopia de fluorescÃncia de raios-X (FRX), difraÃÃo de raios-X (DRX), espectroscopia de absorÃÃo no infravermelho por transformada de Fourier (FTIR) e de energia dispersiva de raios-X (EDS) e microscopia eletrÃnica de varredura (MEV).O processo produtivo utilizado para confecÃÃo dos corpos de prova foi o de Umedecimento, CompactaÃÃo e Secagem (UCOS), com pressÃo de 10 MPa. Em seguida, foram confeccionados corpos de prova com incorporaÃÃo de PCC à massa de gesso em 5 nÃveis, entre 10 e 50% com a finalidade de analisar a influÃncia dessas adiÃÃes sobre as propriedades mecÃnicas, o que foi avaliado por ensaios de compressÃo, dureza e flexÃo em trÃs pontos. Os resultados obtidos determinaram que a relaÃÃo Ãgua/gesso (a/g) que fornece as melhores propriedades mecÃnicas à a de 0,2, sendo esta utilizada na etapa de avaliaÃÃo dos corpos de prova com incorporaÃÃo de PCC. Concluiu-se que, em geral, a crescente incorporaÃÃo do resÃduo foi danosa Ãs propriedades mecÃnicas do bloco de gesso. NÃo obstante, as condiÃÃes estudadas atendem Ãs exigÃncias da NBR 13207, exceto a condiÃÃo com incorporaÃÃo de 50% de PCC. Em geral, as propriedades mecÃnicas se comportaram de forma semelhante entre as condiÃÃes com 10 e 20% de PCC, sendo que a evoluÃÃo de 20 para 30% gerou queda significativa nos resultados de resistÃncia mecÃnica. Com isso, conclui-se que a condiÃÃo de 20% de PCC em gesso e relaÃÃo a/g de 0,2 atende à norma, permite o reaproveitamento de resÃduos e, graÃas ao processo de prensagem, apresenta melhor resistÃncia mecÃnica comparada aos produtos usuais.nÃo hÃhttp://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15321application/pdfinfo:eu-repo/semantics/openAccessporreponame:Biblioteca Digital de Teses e Dissertações da UFCinstname:Universidade Federal do Cearáinstacron:UFC2019-01-21T11:28:34Zmail@mail.com -
dc.title.en.fl_str_mv Evaluation of mechanical properties of gypsum with the incorporation of the products of coal combustion.
dc.title.alternative.pt.fl_str_mv AvaliaÃÃo das propriedades mecÃnicas do gesso com incorporaÃÃo dos produtos da combustÃo do carvÃo.
title Evaluation of mechanical properties of gypsum with the incorporation of the products of coal combustion.
spellingShingle Evaluation of mechanical properties of gypsum with the incorporation of the products of coal combustion.
Francisco Necy Alves JÃnior
Gesso
MecÃnica - ResistÃncia
Gypsum
PCC
Mechanical resistance
ENGENHARIA DE MATERIAIS E METALURGICA
title_short Evaluation of mechanical properties of gypsum with the incorporation of the products of coal combustion.
title_full Evaluation of mechanical properties of gypsum with the incorporation of the products of coal combustion.
title_fullStr Evaluation of mechanical properties of gypsum with the incorporation of the products of coal combustion.
title_full_unstemmed Evaluation of mechanical properties of gypsum with the incorporation of the products of coal combustion.
title_sort Evaluation of mechanical properties of gypsum with the incorporation of the products of coal combustion.
author Francisco Necy Alves JÃnior
author_facet Francisco Necy Alves JÃnior
author_role author
dc.contributor.advisor1.fl_str_mv Ricardo EmÃlio Ferreira Quevedo Nogueira
dc.contributor.advisor1ID.fl_str_mv 20333560353
dc.contributor.advisor1Lattes.fl_str_mv http://lattes.cnpq.br/6064127323404237
dc.contributor.referee1.fl_str_mv Ãnio Pontes de Deus
dc.contributor.referee1ID.fl_str_mv 24220396349
dc.contributor.referee2.fl_str_mv Candido Jorge de Sousa Lobo
dc.contributor.referee2ID.fl_str_mv 80231209304
dc.contributor.referee2Lattes.fl_str_mv http://lattes.cnpq.br/9314305890049461
dc.contributor.authorID.fl_str_mv 66897793353
dc.contributor.authorLattes.fl_str_mv http://lattes.cnpq.br/2140077148537768
dc.contributor.author.fl_str_mv Francisco Necy Alves JÃnior
contributor_str_mv Ricardo EmÃlio Ferreira Quevedo Nogueira
Ãnio Pontes de Deus
Candido Jorge de Sousa Lobo
dc.subject.por.fl_str_mv Gesso
MecÃnica - ResistÃncia
topic Gesso
MecÃnica - ResistÃncia
Gypsum
PCC
Mechanical resistance
ENGENHARIA DE MATERIAIS E METALURGICA
dc.subject.eng.fl_str_mv Gypsum
PCC
Mechanical resistance
dc.subject.cnpq.fl_str_mv ENGENHARIA DE MATERIAIS E METALURGICA
dc.description.sponsorship.fl_txt_mv nÃo hÃ
dc.description.abstract.por.fl_txt_mv The accelerated industrial development of recent decades has been touted as one of the most impacting factors on the environmental imbalance. For this reason, research has been developed aiming, among other objectives, the reuse of waste generated by industrial processes as raw materials or inputs in other processes. This study aims to investigate the viability of using waste generated by the combustion of coal in power plants as an additive in the production of gypsum parts for construction. Coal combustion products (CCP) are already being applied in the construction industry as an additive in concrete, but their use in gypsum masses is very limited, which motivated the current reseach project. Initially the influence of water by varying the addition on mass in 5 levels between 10 and 50% was evaluated in order choose the best ratio water / gypsum about the mechanical properties. The materials used were characterized by fluorescence spectroscopy X-ray (XRF), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and energy dispersive X-ray (EDS) and scanning electron microscopy (SEM). The production process used for making the specimens was the so-called UCOS (portuguese acronym for the initials of wetting, compaction and drying), with pressure of 10 MPa. Then, test pieces were prepared with incorporation of PCC to the mass of gypsum in 5 levels between 10 and 50% to analyze the influence of these additions on mechanical properties, which was evaluated by compression tests, hardness and three point bending. The results determined that the water/gypsum (a/g) that provides the best mechanical properties is 0.2, which is used in the evaluation stage of the specimens with addition of PCC. It was concluded that, in general, increasing the incorporation of the waste was damaging to the mechanical properties of the gypsum block. Nonetheless, the studied conditions meet the requirements of NBR 13207, except for the condition with incorporation of 50% of PCC. In general, the mechanical properties behaved in similarly conditions between 10 and 20% of PCC, but the evolution from 20 to 30% caused a significant decrease in the results. Thus, it is concluded that the condition of 20% PCC in plaster and ratio a/g 0,2 meets the standard, ensures recycling of waste and, due to the pressing process, has better mechanical strength compared to the usual products.
O acelerado desenvolvimento industrial das ultimas dÃcadas tem sido apontado como um dos fatores mais impactantes sobre o desequilÃbrio ambiental. Por esse motivo, pesquisas vÃm sendo desenvolvidas visando o reaproveitamento dos resÃduos gerados pelos processos produtivos industriais como matÃrias-primas ou insumos em outros processos. Este trabalho objetiva investigar a viabilidade de se utilizar um resÃduo gerado pela combustÃo de carvÃo mineral em usinas termoelÃtricas como aditivo na produÃÃo de peÃas de gesso para a construÃÃo civil. Este produto da combustÃo de carvÃo (PCC) jà vem sendo aplicado nas indÃstrias de construÃÃo civil como aditivo em cimento, porÃm sua utilizaÃÃo em massas de gesso à bastante restrita. Inicialmente foi avaliada a influÃncia da Ãgua pela variaÃÃo da sua adiÃÃo à massa de gesso em 5 nÃveis entre 10 e 50%, visando escolha da melhor relaÃÃo Ãgua/gesso quanto Ãs propriedades mecÃnicas. Os materiais utilizados foram caracterizados por espectroscopia de fluorescÃncia de raios-X (FRX), difraÃÃo de raios-X (DRX), espectroscopia de absorÃÃo no infravermelho por transformada de Fourier (FTIR) e de energia dispersiva de raios-X (EDS) e microscopia eletrÃnica de varredura (MEV).O processo produtivo utilizado para confecÃÃo dos corpos de prova foi o de Umedecimento, CompactaÃÃo e Secagem (UCOS), com pressÃo de 10 MPa. Em seguida, foram confeccionados corpos de prova com incorporaÃÃo de PCC à massa de gesso em 5 nÃveis, entre 10 e 50% com a finalidade de analisar a influÃncia dessas adiÃÃes sobre as propriedades mecÃnicas, o que foi avaliado por ensaios de compressÃo, dureza e flexÃo em trÃs pontos. Os resultados obtidos determinaram que a relaÃÃo Ãgua/gesso (a/g) que fornece as melhores propriedades mecÃnicas à a de 0,2, sendo esta utilizada na etapa de avaliaÃÃo dos corpos de prova com incorporaÃÃo de PCC. Concluiu-se que, em geral, a crescente incorporaÃÃo do resÃduo foi danosa Ãs propriedades mecÃnicas do bloco de gesso. NÃo obstante, as condiÃÃes estudadas atendem Ãs exigÃncias da NBR 13207, exceto a condiÃÃo com incorporaÃÃo de 50% de PCC. Em geral, as propriedades mecÃnicas se comportaram de forma semelhante entre as condiÃÃes com 10 e 20% de PCC, sendo que a evoluÃÃo de 20 para 30% gerou queda significativa nos resultados de resistÃncia mecÃnica. Com isso, conclui-se que a condiÃÃo de 20% de PCC em gesso e relaÃÃo a/g de 0,2 atende à norma, permite o reaproveitamento de resÃduos e, graÃas ao processo de prensagem, apresenta melhor resistÃncia mecÃnica comparada aos produtos usuais.
description The accelerated industrial development of recent decades has been touted as one of the most impacting factors on the environmental imbalance. For this reason, research has been developed aiming, among other objectives, the reuse of waste generated by industrial processes as raw materials or inputs in other processes. This study aims to investigate the viability of using waste generated by the combustion of coal in power plants as an additive in the production of gypsum parts for construction. Coal combustion products (CCP) are already being applied in the construction industry as an additive in concrete, but their use in gypsum masses is very limited, which motivated the current reseach project. Initially the influence of water by varying the addition on mass in 5 levels between 10 and 50% was evaluated in order choose the best ratio water / gypsum about the mechanical properties. The materials used were characterized by fluorescence spectroscopy X-ray (XRF), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and energy dispersive X-ray (EDS) and scanning electron microscopy (SEM). The production process used for making the specimens was the so-called UCOS (portuguese acronym for the initials of wetting, compaction and drying), with pressure of 10 MPa. Then, test pieces were prepared with incorporation of PCC to the mass of gypsum in 5 levels between 10 and 50% to analyze the influence of these additions on mechanical properties, which was evaluated by compression tests, hardness and three point bending. The results determined that the water/gypsum (a/g) that provides the best mechanical properties is 0.2, which is used in the evaluation stage of the specimens with addition of PCC. It was concluded that, in general, increasing the incorporation of the waste was damaging to the mechanical properties of the gypsum block. Nonetheless, the studied conditions meet the requirements of NBR 13207, except for the condition with incorporation of 50% of PCC. In general, the mechanical properties behaved in similarly conditions between 10 and 20% of PCC, but the evolution from 20 to 30% caused a significant decrease in the results. Thus, it is concluded that the condition of 20% PCC in plaster and ratio a/g 0,2 meets the standard, ensures recycling of waste and, due to the pressing process, has better mechanical strength compared to the usual products.
publishDate 2015
dc.date.issued.fl_str_mv 2015-09-18
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dc.publisher.program.fl_str_mv Programa de PÃs-GraduaÃÃo em Engenharia e CiÃncia de Materiais
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publisher.none.fl_str_mv Universidade Federal do CearÃ
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