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Dissertations / Theses on the topic 'Clinker Portland'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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1

Gomes, Sylvio Dutra. "Incorporação de enxofre no silicato dicálcico do clínquer de cimento Portland: influência na estabilidade de polimorfos e na reatividade hidráulica." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/44/44144/tde-29062007-113021/.

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O presente trabalho aborda a incorporação de enxofre no silicato dicálcico (Ca2SiO4), fase cristalina que representa entre 20-40% em massa do clínquer de cimento Portland comum e que no âmbito da indústria cimenteira é conhecida como C2S (2CaO.SiO2), ou belita. Este composto apresenta cinco polimorfos, sendo que o polimorfo monoclínico ?-C2S de alta temperatura é o que apresenta maior reatividade com água. Realizou-se síntese de amostras de C2S, a partir de reagentes de alta pureza, com adições de enxofre na forma de CaSO4.2H2O segundo a proporção estequiométrica 2Ca:(1-x)Si:xS, onde x é a pro

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2

Serclerat, Ivan. "Les métaux traces dans le clinker de ciment Portland : rétention dans les mortiers et fixation dans les hydrates." Lyon, INSA, 1996. http://www.theses.fr/1996ISAL0140.

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Ces travaux visent à caractériser le devenir des métaux lourds introduits dans les fours à ciment par les matières premières naturelles, les combustibles fossiles ou les déchets utilisés comme combustibles. La partie expérimentale a porté sur l'étude de ciments industriels et de ciments de laboratoire enrichis en zinc, plomb et chrome au cours de la cuisson. Des tests de lixiviation ont permis de montrer que le zinc est quasiment insoluble entre pH 7 et pH 13. Le plomb est solubilisable uniquement dans les contextes de pH supérieurs à 12,5. Le chrome (VI), dont les sels courants sont très solu

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3

Faure, Antoine. "Capacité d'un sédiment à se substituer à la fraction argileuse de la matière première de l'industrie des liants hydrauliques." Thesis, Limoges, 2017. http://www.theses.fr/2017LIMO0079/document.

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Les retenues hydroélectriques, au même titre que les voies navigables et les ports maritimes, peuvent être soumises à une accumulation de particules solides. Si la majorité des sédiments est gérée au sein même du cours d'eau par transfert dans le lit aval, des raisons techniques ou environnementales pourraient impliquer à l'avenir une gestion à terre des déblais. Quoique considérées comme des déchets par la réglementation, les matières issues de dragage apparaissent comme une ressource noble et renouvelable. Dans une approche d'économie circulaire, certains secteurs industriels semblent en mes

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4

Cáceres, Alberto Eulogio Arias. "Caracterização da matéria-prima (Grupo Itapucumí) e sua queimabilidade para a produção de cimento Portland na industria nacional del cemento (Paraguai)." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/44/44137/tde-25042018-161847/.

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O presente trabalho consiste na detalhada caracterização geológica da Mina de Vallemí no Paraguai, utilizada para fabricação de cimento Portland pela Industria Nacional de Cemento (INC), seguida da caracterização das matérias-primas, por petrografia e análises químicas e mineralógicas, e posteriores testes de queimabilidade de seis farinhas experimentais, elaboradas com misturas das matérias-primas disponíveis. As farinhas foram sinterizadas e avaliadas qualitativamente, por microscopia do clínquer, e quantificadas por difração de raios-X (DRX) e método de Rietveld. A geologia da mina consiste

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5

Magrla, Radek. "Modifikace vlastností portlandských cementů orientovaná na snížení emisí CO2." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-225907.

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This thesis aims to burn raw material with a lower content of carbonate component for the production of Portland cement. Substitution of carbonate component is done by fluidized fly ash. The model cements are tested of basic technological properties and the hydration process is observed.

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6

Gobbo, Luciano de Andrade. "Aplicação da difração de raios-X e método de Rietveld no estudo de Cimento Portland." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/44/44137/tde-23072009-144653/.

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O projeto desenvolvido enfocou a aplicação da difração de raios-X e método de Rietveld (DRX-Rietveld) na caracterização e quantificação do Cimento Portland, constituindo-se em contribuição pioneira sobre o tema em âmbito nacional. Foram estudadas amostras de pozolanas naturais e artificiais, subprodutos industriais de grande disponibilidade na indústria nacional, tais como escórias de alto-forno provenientes das siderúrgicas e cinzas volantes das termelétricas. Adicionalmente, foram estudadas amostras dos componentes utilizados para composição de cimentos laboratoriais, tais como clínqueres, c

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7

Girod-Labianca, Caroline. "Modélisation thermodynamique des diagrammes de phases des clinkers de ciments Portland : étude de l'influence des éléments mineurs : cas du phosphore." Paris 6, 2008. http://www.theses.fr/2008PA066158.

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Le clinker, roche synthétique polyphasée, est le constituant principal des ciments Portland. Le silicate tricalcique (C3S) est la phase majoritaire du clinker anhydre et confère l’essentiel des résistances mécaniques du matériau hydraté (béton, mortier). Actuellement, les cimentiers brûlent dans leurs fours des farines animales détruites par les très hautes températures des fours. Toutefois, ces déchets introduisent du phosphore sous forme de cendres qui s’incorporent au clinker en cours de fabrication. Pour comprendre l’effet du phosphore sur les différents états chimiques du matériau, nous a

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8

Esnault, Vivien. "Compréhension et modélisation du comportement du clinker de ciment lors du broyage par compression." Thesis, Paris Est, 2013. http://www.theses.fr/2013PEST1027/document.

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On appelle clinker le matériau obtenu par cuisson de calcaire et d'argile et qui constitue le principal ingrédient du ciment Portland, composant essentiel de la majorité des bétons produits dans le monde. Ce clinker doit être finement broyé avant de pouvoir présenter une réactivité suffisante. La maîtrise des procédés de broyage représente un enjeu considérable pour l'industrie cimentière : il s'agit du premier poste en termes de consommation électrique d'une usine, en partie du fait de l'inefficacité des procédés employés. Les techniques de broyage par compression, apparues au cours des année

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9

Spurný, Marek. "Účinnost přídavků mletí používaných při výrobě Portlandských cementů." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2019. http://www.nusl.cz/ntk/nusl-401836.

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This work deals kinetics of grinding Portland cement clinker which is influenced by addition of grinding inlays surfactants. In an experiment, attritor-type stirred mill was used and surface active grinding additives such as polyethylenglykol (PEG), triethylamin (TEA) and acetate of ammonium were utilized. Granulometric distribution graph obtained from laser diffraction analysis provides data for plotting development diagrams for milling process.

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10

Mončeková, Miroslava. "Možnosti redukce šestimocného chromu při hydrataci portlandského cementu." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2012. http://www.nusl.cz/ntk/nusl-216811.

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The issue of Hexavalent chromium toxicity to Portland cement hydration is a very actual these days. It takes much effort to obtain a cement containing Cr(VI) less than 2 ppm. The primary objective of this diploma theses is to find appropriate reducing substances and specify their efficiency, as well as to make an attempt to optimize their dosage. As reducing substances there were plumbed sulphites and tin(II) salts. The influence of reducing substances applied to the hydration and cement properties were validated by strenght tests, the calorimetric measurement and the volume-variation measurem

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11

Gobbo, Luciano de Andrade. "Os compostos do clínquer Portland: sua caracterização por difração de raios-X e quantificação por refinamento de Rietveld." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/44/44133/tde-09102003-112552/.

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O projeto enfocou a aplicação da difração de raios-X (DRX) na caracterização e quantificação dos compostos cristalinos do clínquer de cimento Portland, através do método de Rietveld, constituindo-se em contribuição pioneira sobre o tema em âmbito nacional. Foram utilizadas 40 amostras de clínquer provenientes de cinco diferentes unidades fabris, visando ampla representatividade do material de estudo. O clínquer de cimento Portland é o material sinterizado e peletizado, resultante da calcinação de uma mistura adequada de calcário e argila e, eventualmente, de componentes corretivos. Os compost

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12

Tušla, Václav. "Možnosti využití cihelného recyklátu v pojivových systémech s obsahem p-slínku." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2019. http://www.nusl.cz/ntk/nusl-401933.

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This diploma thesis deals with the preparation binder systems based on Portland clinker and recycled brick. Recycled brick is considered a waste material from construction or production of brick products. This thesis uses finely grounded brick recycled and brick dust, which is produced during final processing of burnt bricks. By incorporating brick dust in alternative system based on Portland clinker could bring ecological and economic benefits. This diploma thesis deals with option using brick dust as pozzolan admixture to Portland clinker, with the aim to prepare and test Portland cement, wh

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13

Kozlová, Romana. "Možnosti využití popílků po SNCR pro výrobu portlandského cementu." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2016. http://www.nusl.cz/ntk/nusl-240583.

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The Master thesis deals with utilization possibilities of fly ash after selective non-catalytic reduction (SNCR) process for Portland cement preparation as a correction component to the raw material with regard to contaminated fly ash by ammonium sulphate or ammonium hydrogensulfate that is one of the products from SNCR process. Presented thesis was focused on behaviour of raw meal with ammonia hydrogensulfate contaminated fly ash after SNCR during burning of Portland clinker in simulated kiln conditions. The thesis deals with Portland clinker preparation from this kind of raw mix and it studi

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14

Mončeková, Miroslava. "Úloha síranu železnatého jako regulátoru tuhnutí a redukčního činidla portlandského slínku." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2016. http://www.nusl.cz/ntk/nusl-256551.

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In 2003, the European Community Obligation (directive 2003/5C/EC) regulates a maximal value of soluble hexavalent chromium to 0.0002 % (per weight of dry cement). This limitation leads to modifications of the regular Portland cement by using of suitable reduction agents. Therefore, the possibilities of chromium reduction become a very actual topic. The primary goal of this work is a basic research of the ferrous sulphate influence on hexavalent chromium reduction and also its influence on Portland clinker hydration process. The reduction ability was determined by UV/VIS method. The mechanism a

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15

Escadeillas, Gilles. "Les ciments aux fillers calcaires : contribution a leur optimisation par l'etude des proprietes mecaniques et physiques des betons fillerises." Toulouse 3, 1988. http://www.theses.fr/1988TOU30053.

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Il ressort de l'etude que: les proprietes rheologiques avant prise du liant sont ameliorees par l'ajout de filler, autorisant une diminution de la teneur en eau de gachage; la reactivite de la calcite est confirmee (formation de carboaluminates, diminution de l'aureole de transition); les resistances mecaniques aux jeunes ages sont ameliorees; la fragilite (fissuration. . . ) est attenuee. On envisage l'amelioration de ces procedes par addition d'un superplastifiant

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16

Walter, Martin. "Vlastnosti portlandských cementů s ohledem na ekonomickou a ekologickou efektivitu výroby." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-225915.

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Diploma thesis discusses about design composition and firing process modification of belite clinker. It also deals with the summary of knowledge about chemistry and production technology of portland cements with respect to its ecology and economy.

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17

Zezulová, Anežka. "Vliv oxidu barnatého na tvorbu a vlastnosti portlandského slínku." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2014. http://www.nusl.cz/ntk/nusl-217077.

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Portland clinker is thanks to its large-scale production a continuously studied topic. Clinker, or Portland cement, is used for construction purposes, or for insulation and special applications. One of these special applications could be shielding of different types of radiation by making use of the content of barium ions. The present master’s thesis examines the influence of barium oxide on the formation and properties of Portland clinker, which could be, by incorporation of barium ions into the system, used as a binder for buildings resistant to various types of radiation. Barium sulfate and

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18

Martykán, Jiří. "Sledování vývoje AFt fází ve směsných portlandských cementech s fluidním popílkem." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240190.

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19

Hrdina, Matěj. "Ověření možnosti syntetické přípravy ettringitu a thaumasitu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227221.

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The work is focused on the possibilities of using FBC fly ash for composite cements, monitoring their hydration processes, especially the creation of AFt phase. The possibility of preparing synthetic ettringite and thaumasite and their detection.

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20

Kašpárková, Kateřina. "Vliv oxidů těžkých kovů na tvorbu a vlastnosti portlandského slínku." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240407.

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The Master’s thesis is focused on a study of the effect of increased content of heavy metals present in a raw meal on the formation and properties of prepared clinker and acquired cement. Main attention is devoted to changes on the physical, mechanical, microstructural and hydration properties. The theoretical part contains an overview of clinker minerals occurring in Portland cement including the possibility of incorporation of heavy metals into their structure and affecting the properities of the cement. In the experimental part, there is compared the effect of heavy metal oxides on the comp

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21

Van, Rompaey Gilles. "Etude de la réactivité des ciments riches en laitier, à basse température et à temps court, sans ajout chloruré." Doctoral thesis, Universite Libre de Bruxelles, 2006. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210780.

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Le ciment Portland est de loin le liant hydraulique le plus connu et utilisé depuis de très nombreuses années tant dans le secteur de la construction civile qu’au niveau du stockage des déchets (barrières ouvragées ou matériau de confinement). Le processus industriel qui donne naissance au clinker, constituant de base du ciment Portland, n’a pas subi de modifications depuis des décennies. <p>Par ailleurs, au cours de ces dernières années, certaines considérations telles que le réchauffement climatique et le développement durable ont mis à mal les industries qui émettent des gaz à effets de ser

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22

Centurione, Sérgio Luiz. "A mineralização do clinquer portland e seus benefícios tecnológicos." Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/44/44135/tde-19112015-085440/.

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A alita é o componente mineralógico principal do clínquer portland, sendo responsável pelo desenvolvimento das resistências mecânicas do cimento, sobretudo no período entre 1 e 28 dias de cura. Dentre as sete formas polimórficas desse mineral, destaca-se a simetria romboédrica, como a de mais alta temperatura e a mais reativa, que não se forma em clínqueres convencionais. No entanto, o uso de algumas substâncias ditas mineralizantes pode estabilizar essa estrutura de cristal, com destaque para o par mineralizante F- e \'SO IND.3\'. Os benefícios que o processo de mineralização do clínquer port

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23

Swart, Dustin W. "The utilization of alternative fuels in the production of Portland cement." Auburn, Ala., 2007. http://repo.lib.auburn.edu/07M%20Theses/SWART_DUSTIN_26.pdf.

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24

Akkapeddi, Srikanth Schindler Anton K. "Alternative solid fuels for the production of Portland cement." Auburn, Ala., 2008. http://hdl.handle.net/10415/1432.

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25

Oliveira, Vanessa Carina Heinrichs Chirico. "Estratégias para a minimização da emissão de CO2 de concretos estruturais." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3146/tde-25072016-144256/.

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A maior parte das emissões de CO2 do concreto origina-se na produção do cimento. A estratégia tradicional de minimização da pegada de CO2 tem privilegiado o grau de substituição do clínquer. O trabalho examina o impacto dessa estratégia e também a influência da escolha do fornecedor de cimento sob a ótica de sua matriz energética, a variação do consumo de cimento para concretos de mesma resistência e do desvio padrão do processo produtivo de acordo com o controle do processo de produção do concreto. O método de trabalho inclui dados de revisão bibliográfica, normalização técnica e dados de cen

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26

Gineys, Nathalie. "Influence de la teneur en éléments métalliques sur les propriétés techniques et environnementales du ciment Portland." Thesis, Lille 1, 2011. http://www.theses.fr/2011LIL10111/document.

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L’utilisation du ciment Portland pour l’inertage des déchets via le processus de stabilisation/solidification est particulièrement efficace. Cependant, le traitement de certains déchets fortement contaminés en éléments métalliques reste problématique. En effet, certains éléments peuvent perturber la réactivité du ciment Portland. Ainsi, des déchets, issus du nucléaire et contenant de grandes quantités en chlorures de zinc, sont connus pour inhiber totalement la réactivité du ciment Portland. Une solution à ce problème serait d’utiliser une méthode alternative pour valoriser ces déchets sans qu

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27

Schultz-Loup, Maria Benevenuta. "Betões desfloculados para revestimentos em sistemas térmicos de produção de clinquer Portland." Master's thesis, 1992. http://hdl.handle.net/10773/27599.

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O objectivo do trabalho foi a formulação e caracterização de betões de baixa quantidade de água na mistura, destinados a serem aplicados em alvenarias dos sistemas térmicos de produção de clinquer Portland. Foi feita uma nota introdutória sobre a evolução do consumo pelas principais industrias consumidoras, dos refractários em geral e dos betões em particular. Caracterizaram-se os processos de produção de clinquer Portland e nas instalações existentes as solicitações térmicas, mecânicas e químicas a que os revestimentos betonados estão sujeitos. Caracterizaram-se os principais agentes c

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