Efflorescence
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Mix design formulation range for metakaolin-based geopolymer synthesis
Abstract This article presents a range of mix design formulations to obtain metakaolin-based geopolymer synthesis. Geopolymer samples were synthesized from metakaolin, a 10 M sodium hydroxide solution, and alkaline sodium silicate. These three components were mixed in different proportions to form a paste which was molded in a cylindrical shape, set at room
REM - International Engineering Journal. Publicado em: 2022
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2. Blocks for civil construction made with the sediment deposited in the Candonga dam
Abstract The use of the sediment deposited in the Candonga dam after the collapse of the Fundão dam is being considered as raw material for civil construction. Blocks were obtained by adding 5 % of sodium carbonate and 13 % of water to the dried dredged sediment, which was mixed and heat treated at 700 ºC and cooled slowly inside the oven to room temperatu
REM, Int. Eng. J.. Publicado em: 2019-03
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3. ESTUDO QUÍMICO DE EFLORESCÊNCIAS SALINAS DO SÍTIO ARQUEOLÓGICO TOCA EXÚ DO JURUBEBA DO PARQUE NACIONAL SERRA DA CAPIVARA, PIAUÍ, BRASIL
Toca Exú do Jurubeba is part of a set of archaeological sites located in the Serra da Capivara National Park (Piauí, Brazil), a region of great world interest due to its archaeological potential, especially rock art. However, rock art is constantly threatened by both natural and anthropic factors. Among the natural salts efflorescences that are deposited o
Quím. Nova. Publicado em: 2017-09
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4. Compressive strength, microstructure and hydration products of hybrid alkaline cements
Ordinary Portland cement (OPC) is the dominant binder in the construction industry with a global production that currently reaches a total of 3 Gt per year. As a consequence, the cement industry's contribution to the total worldwide CO2 emissions is of about 7% of the total emissions. Publications on the field of alkali-activated binders (also termed geopoly
Mat. Res.. Publicado em: 27/06/2014
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5. Manifestações patológicas em conjuntos habitacionais: a degradação da fachadas
Cases of deterioration in building facades in Recife and surroundings have been subject to the attention of technical construction in the state of Pernambuco. The presence of visual changes caused by pathological manifestations (fungi, cracks, stains, etc.) in these areas is a warning sign that their performance is in decline. The word pathology, originating
Publicado em: 2010
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6. Formação da eflorescência em cerâmica vermelha : fatores de influência no transporte dos íons SO4 e Ca
Neste trabalho, investigou-se a migração dos íons SO4 -2 e Ca+2 em uma cerâmica vermelha aditivada com CaSO4.2H2O simulando o processo de eflorescência. Para tanto, uma massa cerâmica com tendência não patológica, à base de uma argila da região de Gravataí-RS, foi formulada com 0, 4, 8, 12 e 16% em peso de CaSO4.2H2O. No processamento cerâmico,
Publicado em: 2010
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7. Influência da gipsita no surgimento de eflorescência em telhas cerâmicas
The red ceramic industry is recognized as of major importance in Piauí State. The State capital, Teresina, is the greatest producer of this material ( production about 18 million peaces), which is used mainly for masonry sealing blocks. One of the most frequent problems in this kind of products is the efflorescence. This work has the main objective of study
Publicado em: 2009
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8. Characterization of salt efflorescence using target factor analysis: development of the method
Usando-se análise fatorial TFA (target factor analysis), tentamos desenvolver um método simples e prático para determinar a composição de sais na eflorescência de pinturas de parede, conveniente para o uso no trabalho diário de restauradores. O desenvolvimento do modelo TFA para determinação qualitativa da composição de depósitos de sais nas pint
Journal of the Brazilian Chemical Society. Publicado em: 2009
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9. Estado da arte na alterabilidade de placas pÃtreas: estudo de casos na regiÃo litorÃnea do Recife â PE
The importance of ornamental rocks in architecture is historical; either to the internal areas or to the external ones. Thus, in this study, covering alterability and durability regarding with stony plates in located land external faÃades in the sea shore of Recife are discussed. The civil construction industry uses, in workmanship, the most varied types of
Publicado em: 2008
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10. Estudo de argamassas com agregados reciclados contaminados por gesso de construção. / A study on mortars produced with CDW recycled aggregates containing cypsum plaster as impurity.
This is an abstract of a Master of Science project carried out at EPUSP, Universidade de São Paulo, Brazil, aimed at investigating the effects of the use of recycled aggregates contaminated by small contents of gypsum plaster on masonry mortars. In the presence of moisture and by the action of gypsum minerals or other more complex ones that may occur, there
Publicado em: 2004
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11. Reciclagem de borra oleosa: uma contribuição para a gestão sustentável dos resíduos da indústria de petróleo em Sergipe
The oil industry in Sergipe State has reproduced the ongoing development model based on the use of fossil fuels as the main source of energy, and has generated some pollutants which are hard to treat or dispose of, called oil sludge, basically consisting of oil, solids and water. The final disposition, treatment and recycling of this waste is considered a hi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/07/2003