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Previous issue date: 2017-11-06 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / A fabrica??o dos materiais de constru??o requer elevado disp?ndio de energia e extra??o de recursos naturais, o que implica na gera??o de impactos ambientais preocupantes, em fun??o da produ??o de res?duos gasosos e s?lidos, como tamb?m mudan?as desastrosas do meio ambiente. Nesse contexto, existe um inconveniente do uso de Cimento Portland, em raz?o do alto consumo energ?tico e emiss?o de di?xido de carbono provocado pela calcina??o da mat?ria prima. Outro material poluente ? o proveniente da ind?stria de cer?mica vermelha, o qual emite res?duos gasosos e ainda origina demasiado volume de res?duos s?lidos em virtude de falhas no processo produtivo. Por outro lado, na antiguidade, as argilas termicamente tratadas, inclusive na forma de tijolos cer?micos finamente mo?dos, foram amplamente utilizadas devido ?s reconhecidas propriedades hidr?ulicas que conferiam as argamassas de cal a?rea. Dessa forma, esse estudo pretende avaliar a influ?ncia do res?duo de cer?mica vermelha (RCV) oriundo de telhas nas propriedades de argamassas mistas, a fim de que possa ser dado um destino adequado a esse res?duo. O RCV ap?s cominu?do em part?culas menores que 0,036 mm, foi adicionado em substitui??o parcial ao cimento Portland no tra?o 1:1:6 (cimento: cal: areia) de argamassas mistas empregada em revestimentos de paredes e tetos. Inicialmente o res?duo foi caracterizado e sua atividade pozol?nica investigada por de meio ensaios mec?nicos, an?lises granulom?tricas, termogravim?tricas e microestruturais. O teor de substitui??o das argamassas foi variado em 0, 10, 20 e 30% e as respectivas propriedades no estado fresco (consist?ncia, densidade, teor de vazios e reten??o de ?gua) e no estado endurecido (absor??o de ?gua, densidade, resist?ncia ? tra??o na flex?o e ? compress?o, e m?dulo de elasticidade) foram avaliadas. Constatou-se que o RCV possui significativa quantidade de silicatos e aluminatos reativos, comprovadas pela expressiva atividade pozol?nica que foi identificada nas an?lises qu?micas e f?sicas e no ?ndice de desempenho mec?nico 11% superior ao de refer?ncia. J? na produ??o das argamassas de revestimento com RCV obteve-se uma melhoria na trabalhabilidade, comprovada pela otimiza??o das propriedades no estado fresco, obtidas entre os teores de substitui??o do cimento Portland. No estado endurecido, as propriedades f?sicas e mec?nicas das argamassas com RCV apresentaram-se equivalentes ? argamassa de refer?ncia para os tra?os com 20% e 30% de substitui??o e melhorias significantes para o tra?o com 10% de substitui??o do cimento Portland por RCV. Com isso, constata-se que o RCV apresenta caracter?sticas pozol?nicas que resulta na melhoria das propriedades da argamassa no estado fresco e endurecido, sendo o teor de 10% o mais indicado em virtude da otimiza??o das propriedades. / The manufacture of construction materials requires high energy expenditure and extraction of natural resources, which implies the generation of disturbing environmental impacts, due to the production of gaseous and solid residues, as well as disastrous changes of the environment. In this context, there is a drawback of the use of Portland cement, due to the high energy consumption and emission of carbon dioxide caused by the calcination of the raw material. Other polluting material is that of the red ceramic industry, which emits gaseous waste and still gives rise to too much solid waste due to failures in the production process. On the other hand, in ancient times, thermally treated clays, even in the form of finely ground ceramic bricks, were widely used because of the recognized hydraulic properties that conferred lime mortars. Thus, this study intends to evaluate the influence of the red ceramic residue (CVR) from tiles in the properties of mixed mortars, so that a suitable destination can be given to this residue. The RCV, after being comminuted in particles smaller than 0.036 mm, was added in partial replacement to Portland cement in the 1: 1: 6 (cement: lime: sand) of mixed mortars used in laying of walls and covering of walls and ceilings. Initially the residue was characterized and its pozzolanic activity was investigated by means of mechanical tests, grain size, thermogravimetric and microstructural analyzes. The substitution content of the mortars was varied in 0, 10, 20 and 30% and their properties in the dry state (consistency, density, voids content and water retention) and in the hardened state (water absorption, density, resistance to flexure and compression tensile strength, and modulus of elasticity) were evaluated. It was verified that the RCV has a significant amount of reactive silicates and aluminates, evidenced by the significant pozzolanic activity that was identified in the chemical and physical analyzes and in the mechanical performance index 11% higher than the reference value. In the production of mortars with RCV, an improvement in the workability demonstrated by the optimization of the fresh state properties obtained in the Portland cement substitution levels was obtained. In the hardened state the physical and mechanical properties of RCV mortars were equivalent to reference mortar for the traces with 20% and 30% substitution and significant improvements for the trait with 10% replacement of the Portland cement by RCV. With this, it is verified that the pozzolana obtained from the RCV is a potential Pozolana that results in the improvement of the properties of the mortar in the fresh and hardened state, being the content of 10% the most indicated due to the optimization of all the properties.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/24470 |
| Date | 06 November 2017 |
| Creators | Ara?jo, R?sia Amaral |
| Contributors | 02293726436, Almeida, Maria das Vit?rias Vieira, 52402444487, Pinto, Erica Natasche de Medeiros Gurgel, 00985100451, Cabral, Kleber Cavalcanti, N?brega, Andreza Kelly Costa |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA CIVIL, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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