"Estudo de concretos de alto desempenho frente à ação de cloretos"

Silva, Fernanda Giannotti da

doi:10.11606/t.88.2006.tde-26072006-135429

Cited by 7 publications

(12 citation statements)

References 13 publications

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“…These results were expected since they were the same concretes that obtained lower capillary absorption index, as discussed previously. Silva (2006) realized the same tests on high performance concretes with 5 and 10% silica fume, and after 16 cycles drying and wetting cycles, obtained a reduction in the depth of penetration of 1.9 mm and 2.7 mm, respectively, compared to the reference concrete, which had a penetration front of 5.7 mm. Regarding the nanosilica addition, although the present work has not obtained satisfactory results, Revista ALCONPAT, 8 (2), 2018: 138 -149 Evaluation of nanosilica effects on concrete submitted to chloride ions attack T. Zanon, R. Schmalz, F. G. S. Ferreira 148 some studies indicate that 3% and 6% colloidal nanosilica addition in mortars could reduce 70% and 77% 28-day chlorides migration, respectively, in comparison to reference mortars (Joshaghani;Moeini, 2017).…”

Section: Chloride Ions Penetrationmentioning

confidence: 79%

“…Among these different aggressive agents present in environment are chloride ions and their ability to initiate reinforcement corrosion, even when the solution contained in concrete pores has high pH. In addition, after their reaction with steel, chloride ions are not fixed and are available to continue the reaction (Silva, 2006). These peculiarities make chloride's attack one of the main mechanisms of concrete structures degradation.…”

Section: Introductionmentioning

confidence: 99%

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Avaliação dos efeitos da nanosílica em concretos submetidos à ação de íons cloreto

Zanon¹,

Schmalz

Ferreira

2018

Revista de la Asociación Latinoamericana de Control de Calidad,

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The present paper studied the influence of nanosilica dispersed on superplasticizer, and its combined effect with silica fume, on different concrete properties. Compressive strength, tensile strength by diametrical compression and water absorption by capillarity tests, as well as accelerated durability tests against chloride ions were carried out. Results indicated that isolated nanosilica addition (0.1 to 0.5%) did not improve concretes in any tests performed. However, for 0.5 and 0.7% content of nanosilica combined with 10% of silica fume, there was an increase in compressive strength, reduction of capillary absorption and reduction of chlorides penetration. Keywords: concrete; chloride ions; nanoparticles; nanosilica. Legal InformationRevista ALCONPAT is a quarterly publication by the Asociación Latinoamericana de Control de Calidad, Patología y Recuperación de la Construcción, Internacional, A.C., Km. 6 antigua carretera a Progreso, Mérida, Yucatán, 97310, Tel.5219997385893, alconpat.int@gmail.com, Website: www.alconpat Avaliação dos efeitos da nanosílica em concretos submetidos à ação de íons cloreto RESUMOO presente trabalho estudou a influência da nanosílica dispersa em superplastificante, além do seu efeito combinado com a sílica ativa, em diferentes propriedades dos concretos. Foram realizados ensaios de resistência à compressão, resistência à tração por compressão diametral e absorção de água por capilaridade, além de ensaios acelerados de durabilidade frente aos íons cloreto. Os resultados obtidos indicaram que a adição de nanosílica de forma isolada (0,1 a 0,5%) não conferiu melhorias aos concretos, em nenhum dos ensaios realizados. No entanto, para os teores de 0,5 e 0,7% de nanosílica em conjunto com 10% de sílica ativa, houve aumento de resistência à compressão, redução da absorção capilar e redução da frente de penetração de cloretos. Palavras-chave: concreto; íons cloreto; nanopartículas; nanosílica.Evaluación de los efectos de la nanosílice en hormigones sometidos a la acción de iones de cloruro RESUMENEl presente trabajo estudió la influencia de la nanosílice dispersa en superplastificante, y su efecto combinado con la sílice activa, en diferentes propiedades de los hormigones. Fueron realizados ensayos de resistencia a la compresión, resistencia a la tracción por compresión diametral y absorción de agua por capilaridad, además de ensayos acelerados de durabilidad frente a los iones de cloruro. Los resultados indicaron que la adición de nanosílice (0.1 a 0.5%) no mejoró los hormigones en ninguno de los ensayos realizados. Por otro lado, para los contenidos de 0.5 y 0.7% de nanosílice combinados con 10% de sílice activa, hubo un aumento en la resistencia a la compresión, reducción de la absorción capilar y reducción de la penetración de cloruros.

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Section: Chloride Ions Penetrationmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Avaliação dos efeitos da nanosílica em concretos submetidos à ação de íons cloreto

Zanon¹,

Schmalz

Ferreira

2018

Revista de la Asociación Latinoamericana de Control de Calidad,

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“…Allied to this fact, the presence of small cracks caused by the drying/wetting cycle and by expansion due to the fact that the onset of the corrosion process caused the concrete resistance to decline again, reaching extremely low values at the end of the test. Silva [21] associated this fact to the samples' higher moisture content. It was found that until this inversion in behavior occurred (in this study, after five months of analysis), the samples with various red mud contents behaved similarly to the reference samples (without red mud), and even better at some points.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 97%

“…According to some studies [14,21], the rebar is in the process of corrosion if the diameter of semicircle formed at low frequencies is decreased, as observed in the Nyquist diagram. Therefore, the lower the R e values, the more advanced the corrosion process.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

Effect of Red Mud on the Corrosion of Reinforced Concrete Studied by Electrochemical Impedance Spectroscopy

Ribeiro

Rovere

Souza

et al. 2011

ISRN Materials Science

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The corrosion of concrete reinforcement is a worldwide problem with serious consequences to humans, including accidental deaths that may occur due to the degradation of this material. Thus, techniques that can measure concrete reinforcement corrosion and provide a reliable prediction of this phenomenon are fundamental for the technological development of these materials. The corrosion of steel bars embedded in concrete containing varying amounts of red mud (up to 30% of the total binder) was tested by electrochemical impedance spectroscopy (EIS), under partial immersion in a sodium chloride solution. The addition of red mud delayed the onset of corrosion and possibly also reduced the corrosion rate.

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“…In order for corrosion of steel reinforcement to occur, it is necessary to have four elements: the conductor, which is the steel bar itself, the electrolyte (water) to conduct the ions, the oxygen that forms the corrosion products and a difference of potential for formation of two distinct areas (the ones of anodic and cathodic nature). This latter factor can be caused by different intensities of concrete densification, differences in aeration, humidity or salt concentrations (Silva, 2006). The frequency of corrosion and the problems associated with it show the need to find solutions that contribute to minimize this deterioration process and its evolution in reinforced concrete structures (Vieira, 2003).…”

Section: Introductionmentioning

confidence: 99%

Avaliação da penetração de cloretos em elementos de concreto na cidade de Pelotas/RS

Ferreira

Paliga

Torres

2018

Revista de la Asociación Latinoamericana de Control de Calidad,

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This research aims to verify the compatibility of an existing predictive model of life with the penetration of chlorides in exposed concrete elements in the city of Pelotas / RS. To this end, the samples were exposed at different locations in the city for a period of 16 months and silver nitrate solution was applied to determine the depth of the chlorides. The Bob model (1996) was used for comparison and analysis of the results. Significant values of chloride were found in the elements and a great potential of the model applied when describing the behavior of the depth of chlorides over time, despite the differences found. Keywords: conservation; concrete structures; chlorides; natural test; prediction models. Legal InformationRevista ALCONPAT is a quarterly publication by the Asociación Latinoamericana de Control de Calidad, Patología y Recuperación de la Construcción, Internacional, A.C., Km. 6 antigua carretera a Progreso, Mérida, Yucatán, 97310, Tel.5219997385893, alconpat.int@gmail.com, Website: www.alconpat RESUMENEsta investigación tiene como objetivo verificar la compatibilidad de un modelo de expectativa de vida útil existente con la penetración de cloruros en elementos de concreto expuestos en la ciudad de Pelotas / RS. Para hacer esto, los cuerpos de prueba fueron expuestos en diferentes partes de la ciudad por un período de 16 meses, aplicando la solución de nitrato de plata para determinar la profundidad de los cloruros. El modelo de Bob (1996) fue utilizado para la comparación y el análisis de los resultados. Se encontraron valores significativos de cloruro en los elementos y potencialidad de aplicación del modelo en describir el comportamiento de la profundidad de los cloruros a lo largo del tiempo, a pesar de las diferencias encontradas. Palabras clave: conservación; estructuras de hormigón; cloruros; ensayo natural; modelos de previsión.

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"Estudo de concretos de alto desempenho frente à ação de cloretos"

Cited by 7 publications

References 13 publications

Avaliação dos efeitos da nanosílica em concretos submetidos à ação de íons cloreto

Avaliação dos efeitos da nanosílica em concretos submetidos à ação de íons cloreto

Effect of Red Mud on the Corrosion of Reinforced Concrete Studied by Electrochemical Impedance Spectroscopy

Avaliação da penetração de cloretos em elementos de concreto na cidade de Pelotas/RS

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