Pozzolanic Activity
Mostrando 13-24 de 26 artigos, teses e dissertações.
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13. Study of peanut husk ashes properties to promote its use as supplementary material in cement mortars
The properties of peanut husk ashes as a potential supplementary material in cement mortars were studied in the laboratory. The ashes were prepared in an electric furnace at 500, 650 and 800 ºC during 180 minutes and used without further treatment. The characterization of ashes includes X-Ray fluorescence, X-Ray diffraction, SEM, and determination of pozzol
Rev. IBRACON Estrut. Mater.. Publicado em: 2014-12
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14. Effect of Calcination Temperature on the Pozzolanic Activity of Brazilian Sugar Cane Bagasse Ash (SCBA)
This study evaluated the feasibility of using sugar cane bagasse ash (SCBA), a by-product of the sugar cane ethanol industry, obtained under controlled calcination as a partial replacement for Portland cement in mortars. Materials with pozzolanic characteristics may be used to partially replace cement in mortars or concrete and are known to provide durabilit
Mat. Res.. Publicado em: 01/07/2014
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15. Tratamentos térmico e químico para remoção de óxidos alcalinos de cinzas de capim elefante
Elephant grass ash (EGA) was produced at 700 °C, with two different treatments: hot water (EGAhw) or acid solution (EGAas). The efficiency of the treatments at removing the potassium oxide was evaluated with the aim of using the EGA as a pozzolanic mineral addition for cement-based composites. Characterizations were carried out by X-ray fluorescence (XRF),
Quím. Nova. Publicado em: 2014-06
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16. Estudo da utilização de resíduos industriais de lã cerâmica e lã de vidro em argamassas e concretos / Estudo da utilização de resíduos industriais de lã cerâmica e lã de vidro em argamassas e concretos
A questão de resíduos industriais no que se refere a aspectos ambientais é premente. A geração de passivos ambientais, bem como o esgotamento dos recursos naturais são questões que vêm assumindo posição de destaque no gerenciamento dos resíduos, interferindo inclusive diretamente no mercado. As fibras cerâmicas têm grande aplicação nas indúst
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/07/2011
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17. Potential use of natural red mud as pozzolan for Portland cement
Red mud, the main waste generated in aluminum and alumina production by the Bayer process, is considered hazardous due to its high pH, according to the Brazilian standard NBR 10004/2004, and worldwide generation of this waste exceeds 117 million tons/year. In this work, non-calcined red mud was used, thus requiring less energy and time and reducing costs, wh
Materials Research. Publicado em: 26/01/2011
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18. Production of silica gel from residual rice husk ash
This paper presents a study on the production of silica gel in hydrothermal process using residual rice husk ash. Measurements of the chemical composition, X-ray diffraction, infrared spectroscopy, particle size distribution, and pozzolanic activity were carried out in order to characterize the obtained material, and the optimal silica gel was selected for u
Química Nova. Publicado em: 2011
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19. Caracterização de cinza do bagaço de cana-de-açúcar para emprego como pozolana em materiais cimentícios
This work presents the results of morphological and physical-chemical characteristics of a sugar cane bagasse ash material sample produced under controlled burning conditions. The investigation was carried out by analyzing chemical composition, X-ray diffraction, 29Si nuclear magnetic resonance, morphology, thermal analysis, particle size, specific surface,
Química Nova. Publicado em: 2009
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20. Análise macroscópica do efeito da adição de nanocerâmica ao concreto
Nanoscience and nanotechnology are areas that have a great potential for new materials and new applications development. Recently many researches are using the nanotechnology concept to create Portland concrete composites, where they look for the comprehension of the hydration of cement particles and addition of nanometrics (nm) particles, either nano-silica
Publicado em: 2009
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21. Análise da variação do índice de amorfismo da cinza de casca de arroz sobre a atividade pozolânica / Analysis of variation of the index of amorfization the ash of rice husk on the pozzolanic activity
Cinzas de casca de arroz são resíduos de comprovada eficiência como material pozolânico. No entanto, a variabilidades do material, decorrente das diferentes condições de geração impedem que o mesmo seja comercializado. Assim o presente trabalho tem como objetivo verificar a influência da variação do índice de amorfismo (IA) de cinzas de casca de
Publicado em: 2009
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22. Beneficiamento e caracterização de resíduos gerados na produção de blocos cerâmicos visando à aplicação como adição pozolânica
The use of red ceramics bricks finely grinded as pozzolanic addition to cements, mortar and concrete reveals a viable alternative, with technical, economic and environmental advantages, joining wasted material by the industry, which not always has a proper destination, to the input and products wide used in the civil construction. This work presents the impr
Publicado em: 2008
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23. Análise da viabilidade do uso de cinzas agroindustriais em matrizes cimentícias: estudo de caso da cinza da casca da castanha de caju / Feasibility analysis of using agroindustrial ashes in cementitious materials: case study of ash of the rind of the cashew nut
Nowadays, the use of wastes on civil building has been stimulated for it to be one of most consumers of raw materials in their processes and products. The agroindustrial ashes have a prominent place among the wastes with possibilities of application in cementitious materials, because some ashes, such rice husk ash, have pozzolanic activity, and they contribu
Publicado em: 2008
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24. Potencial de aproveitamento de resíduos de caulim paraibano para o desenvolvimento de argamassas de múltuplo uso. / Potential use of waste kaolin Paraiba for the development of multiple-use mortars.
In Paraíba, the industry of the kaolin, an activity of great importance to the State and local producers, generating large amounts of waste that is landfilled, impacting the environment. The National Council on the Environment (CONAMA) has been made responsible for waste management to their generators. This residue does not have recycling technology known d
Publicado em: 2007