Study of chloride binding and diffusion in GGBS concrete

Luo, Rui; Cai, Yaqi; Wang, Changyi; Huang, Xiaoming

doi:10.1016/s0008-8846(02)00712-3

Cited by 305 publications

(127 citation statements)

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“…Concrete exposed to seawater spray for 25 years, containing high slag replacement rates (45-65%) and a w/c ratio of 0.40, was found to successfully resist chloride ion penetration (71). This effect on chloride penetration is attributed to the capacity to bind chlorides (Friedel's salt formation), thereby reducing the ion diffusion coefficient (70,72,73). Furthermore, the addition of GBFS, while lowering the pH in the pore solution, had no adverse effect on steel corrosion (68,74).…”

Section: Adición De Materiales Mineralesmentioning

confidence: 99%

“…Con altos niveles de reemplazo (45-65%) de escoria y una relación a/c de 0,40 se ha confirmado la resistencia a la penetración del ion cloruro para bloques expuestos a zonas de mareas por 25 años (71). Este efecto, en la penetración de los cloruros se atribuye a la capacidad de enlazar cloruros (formación de Sal de Friedel) reduciendo así su coeficiente de difusión (70,72,73). Adicionalmente, se ha comprobado que la adición de GBFS, aunque disminuye el pH de la solución de poros, no tiene efectos adversos para la corrosión del acero (68,74).…”

Section: Adición De Materiales Mineralesunclassified

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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 Mineralesmentioning

confidence: 99%

Section: Adición De Materiales Mineralesunclassified

Durabilidad del hormigón armado expuesto a condiciones agresivas

Aguirre¹,

Gutiérrez²

2013

Mater. construcc.

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“…A proportion of chloride ions is bound to the solid phase in concrete. This chloride binding process is very complicated and influenced by various factors [16,38,21], which is generally simplified by the binding adsorption isotherms. In this study, we choose the following Langmuir isotherm in the modeling…”

Section: Chloride Bindingmentioning

confidence: 99%

A variable-order time-fractional derivative model for chloride ions sub-diffusion in concrete structures

Chen

Zhang

2013

fcaa

104

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This study proposes a new variable-order fractional diffusion equation model to describe the coupled chloride diffusion-binding processes in reinforced concrete, in which the order of fractional derivative term is a variable function instead of a constant in the standard fractional model. The concentration influence coefficient k is introduced to capture the effect of concentration dependency on chloride transport due to the chloride binding behavior. The two parameters in the proposed model can be determined directly by a statistical analysis of measurement data. Four test cases illustrate that the proposed variable-order fractional derivative model agrees significantly better with experimental data than the most commonly used traditional model governed by the classical Fick's second law, especially when a large concentration coefficient k is involved. That proposed model is also verified by accurately predicting chloride concentration profiles in a period of 200 days.MSC 2010 : 74H15, 74S20, 76R50, 81T80

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“…Improved durability has been achieved by the addition of ground granulated blast furnace slag (GGBS) [3,4], fly ash [5,6], silica fume [7] and metakaolin [8]. It is noteworthy that much of the research cited above into the improved durability performance of concretes incorporating SCM was conducted using CEM I type Portland cements.…”

Section: Introductionmentioning

confidence: 99%