Alkali Activated
Mostrando 1-12 de 44 artigos, teses e dissertações.
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1. Physical-mechanical behavior of alkali-activated materials produced by the one-part method based on fly ash and rice husk ash
Abstract The study on the physical-mechanical properties of alkali-activated materials (AAM) produced by the ‘one-part’ method was carried out. For this, residues such as fly ash and rice husk ash (RHA) were used. The alkaline activator (NaOH) was calcined together with RHA for 2 h at 750 °C. Dry mixes were prepared by replacing fly ash with 10%, 20%, a
Cerâmica. Publicado em: 2022
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2. Characterization of sugarcane bagasse ash (SBA) and its evaluation for use in alkali-activated slag mixtures
Abstract This work proposed to incorporate the sugarcane bagasse ash (SBA) with a high content of organic matter (loss on ignition of 35.87%) in alkali-activated mixtures with blast furnace slag. After grinding SBA, replacement ratios of 10%, 20%, and 30% of the ground ash were used for the flowability evaluation. The mixtures containing 20% and 30% showed a
Cerâmica. Publicado em: 2021-03
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3. A study on the compressive strength and microstructure characteristic of alkali-activated metakaolin cement
ABSTRACT The main purpose of this study was to investigate the compressive strength and microstructure characteristic of alkali-activated metakaolin cement (AAMC). In accordance with this purpose, besides the pure metakaolin activation five other mixtures were designed by substitution of different OPC ratios instead of metakaolin (MK) from 0 to 25 (5, 10, 15
Matéria (Rio J.). Publicado em: 25/11/2019
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4. Alkaline activation of high-calcium ash and iron ore tailings and their recycling potential in building materials
Resumo Materiais álcali ativados são aglomerantes obtidos a partir da ativação alcalina de precursores ricos em alumínio e silício. Os precursores mais comuns utilizados para ativação são as cinzas com baixo teor de cálcio, as escórias de alto forno e o metacaulim. Contudo, a cinza de cavaco de eucalipto (CCE) e o rejeito de minério de ferro (RMF
Ambient. constr.. Publicado em: 10/06/2019
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5. Cenizas de cascarilla de arroz para la activación alcalina de cementantes binarios (ceniza volante/escoria de alto horno)
ABSTRACT Alkali activated mortars made of class F fly ash and blast furnace slag were cast, in order to study the effect of an alternative source of silica on its properties of fluidity and compressive strength. Rice husk ash and sodium silicate solution, mixed with sodium hydroxide, were used for activation of mortars. The mineralogical and structural infor
Matéria (Rio J.). Publicado em: 20/05/2019
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6. Development of metakaolin and geopolymer proppants with nanocarbon materials
Abstract From the first hydraulic fracturing in the 40’s until nowadays, the techniques of each process step have evolved significantly. This study presents a new approach on the development of metakaolin (MK) and geopolymer based proppant with and without nanocarbon materials such as multi-walled carbon nanotubes and graphene oxide. For manufacturing the
Cerâmica. Publicado em: 2019-01
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7. Colorimetric Analysis of Cotton Textile Bleaching through H2O2 Activated by UV Light
The bleaching process is one of the steps of cotton fabric manufacture. Traditionally, the most common bleaching procedure is based on the use of a hydrogen peroxide (H2O2) solution in alkali pH associated with high temperature. In this study, we investigated the possibility of applying a photolysis technique, combining ultraviolet (UV) light and H2O2 in aci
J. Braz. Chem. Soc.. Publicado em: 2018-06
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8. Cytotoxicity Analysis of Ti-7.5Mo Alloy After Biomimetic Surface Treatment to Use as Dental Materials
Titanium (Ti) and its alloys are widely used for medical and dental fields due to their excellent biocompatibility, high corrosion resistance, high specific strength and excellent mechanical properties. Different methods have been developed to improve the surface properties of titanium-based implant materials, and consequently the bone-bonding ability. The T
Mat. Res.. Publicado em: 31/08/2017
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9. 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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10. Corrosion of reinforcing bars embedded in alkali-activated slag concrete subjected to chloride attack
Steel bar embedded in an alkali-activated slag (AAS) concrete was tested under complete immersion, in 3.5% NaCl solution by weight of the slag. Ordinary Portland cement (OPC) was also tested for comparative purposes and exposed to the same solution. Monitoring of open-circuit potential, polarization resistance measurement and electrochemical impedance spectr
Materials Research. Publicado em: 13/12/2011
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11. Cinzas volantes álcali-ativadas com solução combinada de NaOH e Ca(OH)2 / Fly ash alkali-activated with NaOH and Ca(OH)2 solution
Este trabalho teve como objetivo avaliar o comportamento da resistência à compressão, ao longo do tempo, em amostras de argamassas à base de cinzas volantes álcali-ativadas. Como ativador alcalino foi utilizada uma solução combinada de NaOH e Ca(OH)2. A cura das amostras foi realizada de duas formas distintas. Na primeira, as amostras foram mantidas e
Publicado em: 2011
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12. Estudo da influência de diferentes teores de Na2O em argamassas à base de escória de aciaria elétrica álcali-ativada / Study of the influence of Na2O different contents in mortar slag based of electric arc furnace alkali-activated
A indústria da construção civil é um dos maiores consumidores de recursos naturais no Mundo, além de ser responsável por grande parte da geração de CO2, visto que o material mais característico e utilizado do setor, o cimento Portland, contribui com mais de 5% do total das emissões de dióxido de carbono. Outro setor causador de impactos ambientais
Publicado em: 2011