Penetration Of Chloride Ions
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. COMPREENDENDO OS MECANISMOS DE CORROSÃO DE LIGAS DE AL-CU-LI: UMA INVESTIGAÇÃO ATRAVÉS DE TÉCNICAS ELETROQUÍMICAS GLOBAIS E LOCAIS
In this study, the corrosion mechanism of an Al-Cu-Li alloy manufactured by two different treatment routes (T3 and T851) was evaluated by immersion and electrochemical tests in solutions containing chloride ions (Cl-). For both alloys, the formation of cavities on the surface was associated with micrometer-sized intermetallics (IM’s), however, in addition
Química Nova. Publicado em: 2022
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2. Behaviour of cementitious matrices subjected to the combined action of chloride ions and carbonation
ABSTRACT Carbonation and chloride action are the two leading causes of degradation in reinforced concrete structures. Despite the combined action of these two mechanisms being a reality, there is little research on the effect of this combination in cementitious matrices. Furthermore, the incorporation of fly ash in cementitious matrices has been frequently u
Matéria (Rio J.). Publicado em: 18/10/2018
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3. DURABILIDADE DO CONCRETO COM CINZA DE CASCA DE ARROZ NATURAL SEM MOAGEM: MITIGAÇÃO DA REAÇÃO ÁLCALI-SÍLICA E PENETRAÇÃO DE CLORETOS / DURABILITY OF CONCRETE WITH NATURAL RICE HUSK ASH WITHOUT GRINDING: MITIGATION OF ALKALI-SILICA REACTION AND CHLORIDE PENETRATION
O emprego de cinza de casca de arroz (CCA) natural no concreto visa contribuir para a sustentabilidade da construção civil, destinando de maneira adequada, esse material que antes seria considerado um resíduo poluente. Porém, é necessária a investigação das consequências em substituir parte do cimento por CCA natural para produzir concreto com final
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/05/2011
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4. Avaliação das propriedades de transporte de massa contendo adições minerais / Evaluation of the mass transport containing mineral admixtures
A durabilidade das estruturas de concreto armado é prejudicada pela ação deteriorante da penetração de substâncias na forma de gases, vapores e líquidos através de poros e fissuras. Sabe-se que a água, tanto no seu estado puro ou com íons dissolvidos, como os cloretos, sulfato, dióxido de carbono ou oxigênio, pode comprometer a durabilidade das e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/10/2009
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5. Avaliação das propriedades de transporte de massa contendo adições minerais / Evaluation of the mass transport containing mineral admixtures
The durability of reinforced concrete structures is damaged by the degrading action of the penetration of substances in the form of gases, vapors and liquids through the pores and cracks. It is known that water both in its pure form or containing dissolved ions such as chloride, sulphate, carbon dioxide or oxygen ions, can compromise the durability of concre
Publicado em: 2009
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6. Penetração de cloretos em concretos compostos com cimento Portland branco e escória de alto forno, ativados quimicamente / Chloride ion penetration in concretes with white Portland cement and blast furnace slag, chemically activated
The consumption of white Portland cement (WPC), in structural concretes, has been growing lately. Thus, targeting diffuse its use, and confirm its quality and durability as structural cement, this work has the aimed to investigate the effect of concretes compounds with WPC, slag and chemical activator (Na2SO4), on its behavior against chloride ion penetratio
Publicado em: 2008
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7. UTILIZATION STUDY OF RESIDUAL RICE RUSK ASH IN STRUCTURAL CONCRETE: AN ANALYSIS OF THE CHLORIDE DURABILITY / ESTUDO DA UTILIZAÇÃO DE CINZA DA CASCA DO ARROZ RESIDUAL EM CONCRETOS ESTRUTURAIS: UMA ANÁLISE DA DURABILIDADE AOS CLORETOS
A utilização de resíduos como a cinza da casca do arroz produzida sem controle da temperatura na fabricação de concretos reduz o impacto ambiental gerado na cadeia produtiva deste material, significando menor consumo de energia, menor desperdício de recursos naturais, menor poluição do meio ambiente e menor custo agregado. No presente trabalho invest
Publicado em: 2008
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8. Evaluation of the electrical resistivity of concrete as a parameter to calculation of the initiation period of corrosion induced by chlorids in concrete structures / Avaliação da resistividade elétrica do concreto como parâmetro para a previsão da iniciação da corrosão induzida por cloretos em estruturas de concreto
The electrical resistivity of concrete is a very sensitive parameter to its microstructural characteristics, especially in relation to the connectivity and the pore size distribution. This parameter is related to the resistance of the concrete to the penetration of liquids or gases and the moisture content present in the concrete pore network, and therefore,
Publicado em: 2006
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9. PENETRAÇÃO DE CLORETOS EM CONCRETOS COMPOSTOS COM DIFERENTES TEORES DE CINZA DE CASCA DE ARROZ / CHLORIDE PENETRATION IN CONCRETE COMPOSITIONS WITH DIFFERENT CONTENTS OF RICE HUSK ASH
The service life of concrete structures can be extended by controlling aggressive agents often found in the environment that attack concrete. Such agents may cause structures to deteriorate and result in technical losses (physical damage) and financial losses (repair costs). Chloride ions are among the most aggressive agents that attack concrete structures,
Publicado em: 2004
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10. Effect of Ionic Composition of Suspending Solution on Virus Adsorption by a Soil Column
The effect of various electrolytes on the adsorption of poliovirus was measured in 250-cm-long soil columns with ceramic samplers at different depths. Viruses suspended in deionized water moved much farther through the soil than those suspended in tap water, whereas movement in sewage water was intermediate. The salt content of the tap water and sewage water
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11. Penetration of Pseudomonas aeruginosa by Sodium Chloride and Its Relation to the Mechanism of Optical Effects1
When cells of Pseudomonas aeruginosa were suspended in solutions containing increasing concentrations of NaCl, the optical density (OD) of the suspensions measured within 30 sec was found to increase in proportion to the increase in salt concentration. Measurement of intracellular fluid volumes indicated that the volume of the cells decreased roughly in prop
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12. Intracellular ion activities in frog skin in relation to external sodium and effects of amiloride and/or ouabain.
Intracellular activities of sodium, potassium and chloride ions, aiNa, aiK, and aiCl were measured with ion-selective single-, double- and triple-barrelled micro-electrodes in skin and isolated epithelia of Rana temporaria bathed on both sides with normal or modified physiological saline. Apical and basolateral membrane potentials, psi ac and psi cs and resi