Estudo do fosfogesso tratado termicamente e de suas misturas com solo tropical
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| Main Author: | |
|---|---|
| Publication Date: | 2015 |
| Format: | Master thesis |
| Language: | por |
| Source: | Repositório Institucional da UFG |
| Download full: | http://repositorio.bc.ufg.br/tede/handle/tede/5388 |
Summary: | The phosphogypsum is a by-product of process for producing phosphoric acid in the phosphate fertilizers industries and its most common chemical composition is the same as gypsum (calcium sulphate dehydrate). Due to the large amounts produced daily studies are needed to enable its use. As research results, the phosphogypsum is already used in paving, as raw material blocks and boards, in cement industries, in sulphur recovery and sulphuric acid production, and is passed unprocessed to the agricultural sector. In this context, the main objective of this work was the study of phosphogypsum subjected to heat treated (TT) in mixtures with tropical soil in order to enable and expand its use in geotechnical works. To that end, it made the thermal treatment of phosphogypsum, which promotes its dehydration. For definition of mixtures were carried out Atterberg limits, compaction and expansion tests in samples containing soil, phosphogypsum TT and cement. The choice was made so that if using the highest percentage of phosphogypsum TT, since the samples having greater or equal to 7 plasticity index and expansion less than 0.5%. From this mixture, four mixtures were defined with tropical soil, phosphogypsum TT or dihydrate (DH), with or without cement. Miniature compaction tests were carried out with wet curing times of 5min, 25min and 2h so check their influence on compaction parameters of mixtures. In the analysis of hydromechanical behaviour, were carried out expansion testing, mini-CBR, expansability, simple compression test, slaking test and permeability test. To complement the analysis, scanning electron microscopy images were made, as also energy dispersive spectroscopy and testing of X-ray diffraction. For the reactions of phosphogypsum TT in the presence of water, the study of its rehydration was conducted and analysed the implications in its hydromechanical behavior. From the results it was observed that occurs the formation of hemihydrate and anhydrous gypsum by thermal treatment, and the formation of hemihydrate occurs from 110°C. The dry unit weight of mixtures with phosphogypsum TT decreases with increase of wet cure time, which is related to the growth of gypsum crystals during the rehydration process. The hydro-mechanical behavior of the mixtures containing phosphogypsum TT is better than those with DH phosphogypsum, and although rehydration occurs, the resistance of these mixtures are still higher than for mixtures containing phosphogypsum DH not subject to saturation. The mixture of soil and phosphogypsum TT showed high resistance, even after being subjected to saturation, which suggests that the cement used is unnecessary. |
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| author | Alves, Kárita Christina Soares Kanaiama |
| author_browse | Alves, Kárita Christina Soares Kanaiama |
| author_facet | Alves, Kárita Christina Soares Kanaiama |
| author_role | author |
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| collection | Repositório Institucional da UFG |
| contributor_str_mv | Mascarenha, Marcia Maria dos Anjos Rezende, Lilian Ribeiro de Mascarenha, Marcia Maria dos Anjos Cascudo, Oswaldo Thomé, Antônio |
| dc.contributor.advisor-co1.fl_str_mv | Rezende, Lilian Ribeiro de |
| dc.contributor.advisor-co1Lattes.fl_str_mv | http://lattes.cnpq.br/9258692609398794 |
| dc.contributor.advisor1.fl_str_mv | Mascarenha, Marcia Maria dos Anjos |
| dc.contributor.advisor1Lattes.fl_str_mv | http://lattes.cnpq.br/5184066802578105 |
| dc.contributor.author.fl_str_mv | Alves, Kárita Christina Soares Kanaiama |
| dc.contributor.authorLattes.fl_str_mv | http://lattes.cnpq.br/6362544452837283 |
| dc.contributor.referee1.fl_str_mv | Mascarenha, Marcia Maria dos Anjos |
| dc.contributor.referee2.fl_str_mv | Cascudo, Oswaldo |
| dc.contributor.referee3.fl_str_mv | Thomé, Antônio |
| dc.date.accessioned.fl_str_mv | 2016-03-29T12:50:59Z |
| dc.date.issued.fl_str_mv | 2015-08-31 |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.citation.fl_str_mv | ALVES, K. C. S. K. Estudo do fosfogesso tratado termicamente e de suas misturas com solo tropical. 2015. 123 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2015. |
| dc.identifier.uri.fl_str_mv | http://repositorio.bc.ufg.br/tede/handle/tede/5388 |
| dc.language.iso.fl_str_mv | por |
| dc.publisher.country.fl_str_mv | Brasil |
| dc.publisher.department.fl_str_mv | Escola de Engenharia Civil - EEC (RG) |
| dc.publisher.initials.fl_str_mv | UFG |
| dc.publisher.none.fl_str_mv | Universidade Federal de Goiás |
| dc.publisher.program.fl_str_mv | Programa de Pós-graduação em Geotecnia, Estruturas e Construção Civil (EEC) |
| dc.relation.cnpq.fl_str_mv | 8794820169253231856 |
| dc.relation.confidence.fl_str_mv | 600 600 600 600 |
| dc.relation.department.fl_str_mv | 724087251626315585 |
| dc.relation.program.fl_str_mv | 6915322422128222104 |
| dc.relation.sponsorship.fl_str_mv | 2075167498588264571 |
| dc.rights.driver.fl_str_mv | http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
| dc.source.none.fl_str_mv | reponame:Repositório Institucional da UFG instname:Universidade Federal de Goiás (UFG) instacron:UFG |
| dc.subject.cnpq.fl_str_mv | ENGENHARIA CIVIL::GEOTECNICA |
| dc.subject.eng.fl_str_mv | Phosphogypsum Heat treatment Tropical soils Chemical stabilization Rehydration |
| dc.subject.por.fl_str_mv | Fosfogesso Tratamento térmico Solos tropicais Estabilização química Reidratação |
| dc.title.alternative.eng.fl_str_mv | Study of heat treated phosphogypsum and mixtures with tropical soil |
| dc.title.por.fl_str_mv | Estudo do fosfogesso tratado termicamente e de suas misturas com solo tropical |
| dc.type.driver.fl_str_mv | info:eu-repo/semantics/masterThesis |
| dc.type.status.fl_str_mv | info:eu-repo/semantics/publishedVersion |
| description | The phosphogypsum is a by-product of process for producing phosphoric acid in the phosphate fertilizers industries and its most common chemical composition is the same as gypsum (calcium sulphate dehydrate). Due to the large amounts produced daily studies are needed to enable its use. As research results, the phosphogypsum is already used in paving, as raw material blocks and boards, in cement industries, in sulphur recovery and sulphuric acid production, and is passed unprocessed to the agricultural sector. In this context, the main objective of this work was the study of phosphogypsum subjected to heat treated (TT) in mixtures with tropical soil in order to enable and expand its use in geotechnical works. To that end, it made the thermal treatment of phosphogypsum, which promotes its dehydration. For definition of mixtures were carried out Atterberg limits, compaction and expansion tests in samples containing soil, phosphogypsum TT and cement. The choice was made so that if using the highest percentage of phosphogypsum TT, since the samples having greater or equal to 7 plasticity index and expansion less than 0.5%. From this mixture, four mixtures were defined with tropical soil, phosphogypsum TT or dihydrate (DH), with or without cement. Miniature compaction tests were carried out with wet curing times of 5min, 25min and 2h so check their influence on compaction parameters of mixtures. In the analysis of hydromechanical behaviour, were carried out expansion testing, mini-CBR, expansability, simple compression test, slaking test and permeability test. To complement the analysis, scanning electron microscopy images were made, as also energy dispersive spectroscopy and testing of X-ray diffraction. For the reactions of phosphogypsum TT in the presence of water, the study of its rehydration was conducted and analysed the implications in its hydromechanical behavior. From the results it was observed that occurs the formation of hemihydrate and anhydrous gypsum by thermal treatment, and the formation of hemihydrate occurs from 110°C. The dry unit weight of mixtures with phosphogypsum TT decreases with increase of wet cure time, which is related to the growth of gypsum crystals during the rehydration process. The hydro-mechanical behavior of the mixtures containing phosphogypsum TT is better than those with DH phosphogypsum, and although rehydration occurs, the resistance of these mixtures are still higher than for mixtures containing phosphogypsum DH not subject to saturation. The mixture of soil and phosphogypsum TT showed high resistance, even after being subjected to saturation, which suggests that the cement used is unnecessary. |
| eu_rights_str_mv | openAccess |
| format | masterThesis |
| id | UFG-2_6504b8bc04bb6fabe89b68fe8d021d1a |
| identifier_str_mv | ALVES, K. C. S. K. Estudo do fosfogesso tratado termicamente e de suas misturas com solo tropical. 2015. 123 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2015. |
| instacron_str | UFG |
| institution | UFG |
| instname_str | Universidade Federal de Goiás (UFG) |
| language | por |
| network_acronym_str | UFG-2 |
| network_name_str | Repositório Institucional da UFG |
| oai_identifier_str | oai:repositorio.bc.ufg.br:tede/5388 |
| publishDate | 2015 |
| publishDateSort | 2015 |
| publisher.none.fl_str_mv | Universidade Federal de Goiás |
| reponame_str | Repositório Institucional da UFG |
| repository.mail.fl_str_mv | grt.bc@ufg.br |
| repository.name.fl_str_mv | Repositório Institucional da UFG - Universidade Federal de Goiás (UFG) |
| repository_id_str | oai:repositorio.bc.ufg.br:tede/1234 |
| rights_invalid_str_mv | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| spelling | Mascarenha, Marcia Maria dos Anjoshttp://lattes.cnpq.br/5184066802578105Rezende, Lilian Ribeiro dehttp://lattes.cnpq.br/9258692609398794Mascarenha, Marcia Maria dos AnjosCascudo, OswaldoThomé, Antôniohttp://lattes.cnpq.br/6362544452837283Alves, Kárita Christina Soares Kanaiama2016-03-29T12:50:59Z2015-08-31ALVES, K. C. S. K. Estudo do fosfogesso tratado termicamente e de suas misturas com solo tropical. 2015. 123 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2015.http://repositorio.bc.ufg.br/tede/handle/tede/5388The phosphogypsum is a by-product of process for producing phosphoric acid in the phosphate fertilizers industries and its most common chemical composition is the same as gypsum (calcium sulphate dehydrate). Due to the large amounts produced daily studies are needed to enable its use. As research results, the phosphogypsum is already used in paving, as raw material blocks and boards, in cement industries, in sulphur recovery and sulphuric acid production, and is passed unprocessed to the agricultural sector. In this context, the main objective of this work was the study of phosphogypsum subjected to heat treated (TT) in mixtures with tropical soil in order to enable and expand its use in geotechnical works. To that end, it made the thermal treatment of phosphogypsum, which promotes its dehydration. For definition of mixtures were carried out Atterberg limits, compaction and expansion tests in samples containing soil, phosphogypsum TT and cement. The choice was made so that if using the highest percentage of phosphogypsum TT, since the samples having greater or equal to 7 plasticity index and expansion less than 0.5%. From this mixture, four mixtures were defined with tropical soil, phosphogypsum TT or dihydrate (DH), with or without cement. Miniature compaction tests were carried out with wet curing times of 5min, 25min and 2h so check their influence on compaction parameters of mixtures. In the analysis of hydromechanical behaviour, were carried out expansion testing, mini-CBR, expansability, simple compression test, slaking test and permeability test. To complement the analysis, scanning electron microscopy images were made, as also energy dispersive spectroscopy and testing of X-ray diffraction. For the reactions of phosphogypsum TT in the presence of water, the study of its rehydration was conducted and analysed the implications in its hydromechanical behavior. From the results it was observed that occurs the formation of hemihydrate and anhydrous gypsum by thermal treatment, and the formation of hemihydrate occurs from 110°C. The dry unit weight of mixtures with phosphogypsum TT decreases with increase of wet cure time, which is related to the growth of gypsum crystals during the rehydration process. The hydro-mechanical behavior of the mixtures containing phosphogypsum TT is better than those with DH phosphogypsum, and although rehydration occurs, the resistance of these mixtures are still higher than for mixtures containing phosphogypsum DH not subject to saturation. The mixture of soil and phosphogypsum TT showed high resistance, even after being subjected to saturation, which suggests that the cement used is unnecessary.O fosfogesso é um subproduto da produção de ácido fosfórico nas indústrias de adubos e fertilizantes fosfatados e sua composição química mais comum é a mesma do gesso natural (sulfato de cálcio diidratado). Devido às grandes quantidades produzidas diariamente são necessários estudos que viabilizem seu aproveitamento. Como resultados de pesquisas, o fosfogesso já é utilizado na pavimentação, na construção civil como matéria prima de blocos e placas, nas indústrias de cimento, de recuperação de enxofre e de produção de ácido sulfúrico, além de ser repassado sem processamento ao setor agrícola. Nesse contexto, o objetivo principal deste trabalho foi realizar o estudo do fosfogesso tratado termicamente (TT) em misturas com solo tropical, a fim de viabilizar e ampliar sua utilização em obras geotécnicas. Para tanto, foi feito o tratamento térmico do fosfogesso, o qual promove a sua desidratação. Para definição das misturas, foram realizados ensaios de limites de consistência, de compactação e de expansão em amostras contendo solo, fosfogesso TT e cimento. A escolha foi feita de modo que se utilizasse a maior porcentagem de fosfogesso TT, desde que os ensaios apresentassem índice de plasticidade maior ou igual a 7 e expansão inferior a 0,5%. A partir dessa mistura, foram definidas no total quatro misturas com solo tropical, fosfogesso TT ou diidratado (DH), com ou sem cimento. Foram realizados ensaios de compactação miniatura, com tempos de cura úmida de 5min, 25min e 2h de modo a verificar sua influência nos parâmetros de compactação das misturas. Na análise do comportamento hidromecânico, foram realizados os ensaios de expansão, mini-CBR, expansibilidade, resistência à compressão simples, desagregação e permeabilidade. Para complementação das análises, foram feitas imagens de microscopia eletrônica de varredura, espectroscopia de energia dispersiva e ensaios de difração de raios X. Pelas reações do fosfogesso TT na presença de água, foi desenvolvido o estudo da reidratação do mesmo e as implicações no comportamento hidromecânico. Dos resultados foi possível observar que ocorre a formação do fosfogesso hemidratado e anidro pelo tratamento térmico, sendo que a formação do hemidratado ocorre a partir dos 110ºC. O tempo de cura úmida diminui o peso específico seco das misturas com fosfogesso TT, o que está relacionado ao crescimento de cristais de fosfogesso TT durante o seu processo de reidratação. O comportamento hidromecânico das misturas com fosfogesso TT é melhor do que o daquelas com o fosfogesso DH, e que, embora ocorra a reidratação, as resistências dessas misturas ainda são superiores aos das misturas com fosfogesso DH não submetidas à saturação. A mistura de solo e fosfogesso TT mostrou elevadas resistências, mesmo após ser submetida à saturação, o que sugere que o uso do cimento seja desnecessário.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESapplication/pdfporUniversidade Federal de GoiásPrograma de Pós-graduação em Geotecnia, Estruturas e Construção Civil (EEC)UFGBrasilEscola de Engenharia Civil - EEC (RG)http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessFosfogessoTratamento térmicoSolos tropicaisEstabilização químicaReidrataçãoPhosphogypsumHeat treatmentTropical soilsChemical stabilizationRehydrationENGENHARIA CIVIL::GEOTECNICAEstudo do fosfogesso tratado termicamente e de suas misturas com solo tropicalStudy of heat treated phosphogypsum and mixtures with tropical soilinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis691532242212822210460060060060072408725162631558587948201692532318562075167498588264571reponame:Repositório Institucional da UFGinstname:Universidade Federal de Goiás (UFG)instacron:UFGLICENSElicense.txtlicense.txttext/plain; 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| spellingShingle | Estudo do fosfogesso tratado termicamente e de suas misturas com solo tropical Alves, Kárita Christina Soares Kanaiama Fosfogesso Tratamento térmico Solos tropicais Estabilização química Reidratação Phosphogypsum Heat treatment Tropical soils Chemical stabilization Rehydration ENGENHARIA CIVIL::GEOTECNICA |
| status_str | publishedVersion |
| title | Estudo do fosfogesso tratado termicamente e de suas misturas com solo tropical |
| title_full | Estudo do fosfogesso tratado termicamente e de suas misturas com solo tropical |
| title_fullStr | Estudo do fosfogesso tratado termicamente e de suas misturas com solo tropical |
| title_full_unstemmed | Estudo do fosfogesso tratado termicamente e de suas misturas com solo tropical |
| title_short | Estudo do fosfogesso tratado termicamente e de suas misturas com solo tropical |
| title_sort | Estudo do fosfogesso tratado termicamente e de suas misturas com solo tropical |
| topic | Fosfogesso Tratamento térmico Solos tropicais Estabilização química Reidratação Phosphogypsum Heat treatment Tropical soils Chemical stabilization Rehydration ENGENHARIA CIVIL::GEOTECNICA |
| url | http://repositorio.bc.ufg.br/tede/handle/tede/5388 |