Pozzolanic Material
Mostrando 13-24 de 29 artigos, teses e dissertações.
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13. Sterile Clay Pozzolans from Phosphate Mining
The work presents the characterization of clays from sterile mining of the concentrated phosphatic materials of Araxá in Minas Gerais as pozzolanic materials. Three clays of distinct tones, namely, yellow (YC), red (RC), and intermediate (IC) clays, were used at different levels of excavation depth. The clays were calcined at three temperatures (680, 760, a
Mat. Res.. Publicado em: 17/11/2015
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14. Study of the Influence of Chemical Composition on the Pozzolanicity of Soda-lime Glass Microparticles
The use of residues, in partial or total substitution of aggregates or binders in concrete, presents interesting possibilities for obtaining eco-efficient concretes. Research has investigated the use of glass residue in Portland cement composite, whether as an aggregate or a supplementary cementitious material. However, there is still no consensus on the inf
Mat. Res.. Publicado em: 17/11/2015
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15. 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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16. 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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17. 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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18. Reciclaje de escoria granulada de fundición (EGF) como sustitución de parte del cemento en hormigón
The recycling of industrial solid wastes has become an indispensable practice to the natural resource preservation, in the cost and environmental impact reduction. The utilization of alternative materials in the civil construction industry is attractive and correct way in terms of economy and environment. As result of that, the slag recycling as raw material
Matéria (Rio de Janeiro). Publicado em: 07/04/2009
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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. Estudo de dosagem de concreto convencional feito como CP II F-32 e agregados de Rio Branco-Acre e utilização de uma argila calcinada como pozolana na substituição parcial do cimento
In the state of Acre, Brazil, traditional fine and coarse grain aggregates are used. By the way, the concrete materials proportioning (of that region, as well as of all regions) aim to reach the better quality (strength, durability) instead of costs. This paper offers data for a rational concrete dosage using sand of the Rio Acre, granite aggregate from the
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. Portland cement, fly ash and hydrated lime systems: hydration mechanism, microstructure and concrete carbonation. / Sistemas cimento, cinza volante e cal hidratada: mecanismo de hidratação, microestrutura e carbonatação de concreto.
A utilização de cinza volante na composição de material cimentício o torna mais sustentável, além de conferir à matriz hidratada características peculiares que melhoram o desempenho frente à ação de diferentes agentes deletérios. A principal desvantagem da utilização de pozolana no sistema cimentício é a maior susceptibilidade à carbonataç
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