Carbonation-induced reinforcement corrosion in silica fume concrete

Kulakowski, Marlova Piva; Pereira, Fernanda Macedo; Molin, Denise Carpena Coitinho Dal

doi:10.1016/j.conbuildmat.2008.08.005

Cited by 102 publications

(23 citation statements)

References 7 publications

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“…Asimismo, se reporta que se reduce la capacidad de enlazar cloruros en la pasta de cemento endurecida debido a su bajo contenido de alú-mina (64). Con respecto a la carbonatación, Kulakowski et al (65) afirman que los hormigones con SF y relaciones agua/cemento de 0,45 a 0,50 incrementan la resistencia a la carbonatación, sin embargo, puede llegar a tener un efecto perjudicial si las relaciones agua/cemento…”

Section: Adición De Materiales Mineralesunclassified

Durabilidad del hormigón armado expuesto a condiciones agresivas

Aguirre¹,

Gutiérrez²

2013

Mater. construcc.

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Reinforced concrete is the most widely used construction material in the world. The combination of high compressive strength, afforded by concrete and, and the excellent mechanical properties that characterise steel make it an ideal composite for all manner of structures. One of the main weaknesses of this material, however, is that when the concrete is exposed to aggressive environments, in particular high concentrations of chloride ions or carbon dioxide, reinforcing steel corrodes, shortening service life. This article reviews the state of the art on concrete durability, along with the conditions that affect its useful life by inducing reinforcing steel corrosion. It also discusses the prevention and control methods, in particular electrochemical prevention and rehabilitation techniques, that have been developed to mitigate the problem.Keywords: reinforced concrete; steel corrosion; mineral additions; electrochemical rehabilitation. RESUMENEl hormigón armado se ha convertido en el material más utilizado a nivel mundial en el sector de la construcción. La combinación de las altas prestaciones a resistencia a la compresión que ofrece el hormigón y las excelentes propiedades mecánicas del acero lo hacen el material compuesto ideal para aplicaciones estructurales. Sin embargo, uno de los mayores problemas que afecta la vida útil del hormigón es la corrosión del acero de refuerzo, la cual se presenta cuando el hormigón se encuentra expuesto a ambientes agresivos, en especial frente a la exposición a iones cloruros y/o dióxido de carbono. Este trabajo revisa el estado del conocimiento con respecto a la durabilidad del hormigón enfatizando en los fenóme-nos que afectan su durabilidad y generan la corrosión del acero de refuerzo, adicionalmente se incluyen los métodos de prevención y control que se han desarrollado para mitigar el problema, en particular los relacionados con las técnicas electroquímicas de prevención y rehabilitación. INTRODUCTIONVersatility and low cost have made concrete one of the world's most popular construction materials (1, 2). This ceramic material is characterised by high compressive strength, although it is prone to cracking under other types of mechanical stress such as bending and tensile forces, torque and shear. That weakness led to the advent of reinforced concrete, a combination of concrete and structural steel widely used to build bridges, buildings in general and skyscrapers in particular, tunnels and a host of other structures. One of the most important features of concrete, in addition to its mechanical properties, is its durability, which is associated with the inservice life of structures exposed to certain conditions or environments (3, 4). More specifically, reinforcing steel corrosion has been identified as the main weakness of reinforced concrete (5). This paper discusses the main types of concrete deterioration, including the processes that contribute to steel corrosion, and the respective prevention and control methods, such as the use of inhibitors and coatings, ...

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Section: Adición De Materiales Mineralesunclassified

Durabilidad del hormigón armado expuesto a condiciones agresivas

Aguirre¹,

Gutiérrez²

2013

Mater. construcc.

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“…Logo, observa-se na simulação que a medida em que a resistência à compressão do concreto aumenta, o teor de adições deixa de influenciar na profundidade de carbonatação. Kulakowski et al (2009) relatam que em concretos de resistências mais elevadas (superior a 30 MPa), devido à menor relação água/aglomerante (inferior a 0.50), a porosidade é menor, havendo dificuldade de acesso do CO2 para o interior do concreto e, consequentemente, menor profundidade de carbonatação do material, mesmo para concretos com baixa reserva alcalina. Os autores destacam que, para concretos de resistências superiores a 40 MPa, o avanço da frente de carbonatação independe das adições e do tipo de cimento.…”

Section: Análise Paramétricaunclassified

“…Os autores destacam que, para concretos de resistências superiores a 40 MPa, o avanço da frente de carbonatação independe das adições e do tipo de cimento. Já para concretos de resistência inferiores (relação água/aglomerante mais elevada), a presença de adições aumenta a profundidade carbonatada, e predomina o efeito de reserva alcalina (Kulakowski et al, 2009 …”

Section: Análise Paramétricaunclassified

Análise paramétrica da carbonatação em estruturas de concreto armado via Redes Neurais Artificiais

Félix

Carrazedo

Possan

2017

Revista de la Asociación Latinoamericana de Control de Calidad,

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RESUMOO presente trabalho tem como objetivo analisar parametricamente a influência dos principais fatores que afetam o avanço da carbonatação em estruturas de concreto. Para tal, desenvolveu-se um modelo numérico empregando Redes Neurais Artificiais (RNAs) do tipo Multi-Layer Perceptron, sendo concebido em linguagem orientada a objetos C++, o qual foi testado com dados reais de degradação disponíveis na literatura. Os resultados obtidos na análise paramétrica reforçam conceitos já conhecidos na literatura, demonstrando a eficiência de RNAs no estudo da carbonatação do concreto, além de agregar conhecimento à área de patologia das construções. Palavras chave: carbonatação do concreto; tempo de iniciação da corrosão; Redes Neurais Artificiais; modelagem matemática. _______________________________________________________________

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“…Therefore, diffusion of CO 2 and carbonation will diminish [14]. Yet another research group had a neutral view on the effects of SCMs on carbonation as it may differ according to the exact structure and environment of the paste, such as water-tobinder ratio (w/b) and replacement level [9,15]. This disagreement on the effects of SCMs on carbonation could be due to difference in permeability or w/b between the samples tested by different groups.…”

Section: Introductionmentioning

confidence: 99%

Effects of incorporating nanosilica on carbonation of cement paste

Lim

Mondal

2015

J Mater Sci

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An accelerated carbonation test (at 5 % CO 2 , 22°C and 55 % RH) was carried out on bulk and powdered cement paste samples incorporating two different supplementary cementitious materials: microsilica and nanosilica. Extensive characterization using thermogravimetric analysis, scanning electron microscopy with X-ray microanalysis, and image analysis was performed at various degrees of carbonation, to study the fundamental effects of nanosilica on carbonation of main hydration products, calcium hydroxide (CH) and calcium silicate hydrate (C-S-H). Results at every stage were compared with the effects of microsilica addition to cement paste. Results suggested that incorporation of small amounts of micro or nanosilica can decrease the total carbonation of cement paste. In particular, nanosilica could reduce carbonation (decalcification) of C-S-H and the depth of carbonation significantly.

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Carbonation-induced reinforcement corrosion in silica fume concrete

Cited by 102 publications

References 7 publications

Durabilidad del hormigón armado expuesto a condiciones agresivas

Durabilidad del hormigón armado expuesto a condiciones agresivas

Análise paramétrica da carbonatação em estruturas de concreto armado via Redes Neurais Artificiais

Effects of incorporating nanosilica on carbonation of cement paste

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