Corrosion behavior of steel bar embedded in fly ash concrete

Choi, Yo Han; Kim, Jung-Gu; Lee, Kwang-Myong

doi:10.1016/j.corsci.2005.05.019

Cited by 162 publications

(55 citation statements)

References 13 publications

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“…The above mentioned authors [6][7][8] confirmed that the addition of GGBS influence the electromechanical response of pore solutions in cement system; this position is consistent with the finding of Daube et al when he observed that GGBS can be effective in reducing the pore size, [9] and cumulative pore volume considerably [10]. Compressive strength is a property that relates to other concrete properties and gives indication to its performance.…”

Section: Introductionsupporting

confidence: 78%

Effect of South African Quaternary Extenders on Early Compressive Strength

Akinwale¹,

Ikotun²,

Afolabi³

2017

International Conference of Recent Trends in Environmental Science and Engineering

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-In this paper, the embedded reinforcement in concrete are usually sheltered from corrosion by a thick oxide layer formed on their exteriors because of the highly alkalinity of the exposed environment of the adjoining concrete which thus affect both the strength and durability of the affected structures. In spite of this protective mechanism, corrosion of the reinforcement remains one of the biggest common durability challenges. On the other hand, this destructive phenomenon affects not only the durability but the strength of the affected structures. However, the use of cementitious blends which has generated huge research interest for many years has greatly increased due to environmental concern and awareness. The present study focusses on investigating the effect of quaternary combination of South African supplementary cementitious materials on the early strength development of the concrete with a view to encourage local usage of these power plant by-products and to encourage reduction of CO 2 emission during the cement production.

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Section: Introductionsupporting

confidence: 78%

Effect of South African Quaternary Extenders on Early Compressive Strength

Akinwale¹,

Ikotun²,

Afolabi³

2017

International Conference of Recent Trends in Environmental Science and Engineering

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“…Por su morfología incrementa la trabajabilidad del hormigón sin incrementar la cantidad de agua necesaria en la mezcla (2). La adición de FA tiene efectos benéficos en algunas propiedades mecánicas del hormigón, además tiene buen desempeño frente al ataque por iones cloruros, porque se disminuye la permeabilidad del hormigón (76)(77)(78); igual que en el caso de las escorias, su efecto se atribuye a la capacidad de enlazar cloruros principalmente por su alto 40%. Boğa and Topçu (80) observed that replacement rates as low as 15% reduced chloride permeability, concurring with findings by other authors (81,82).…”

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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“…In recent years, more attention has been paid to the corrosion of steel bars in concrete due to the attack of seawater. For instance, in experimental studies on the mechanism of corrosion of reinforced steel bars, Elsener calculated instantaneous values of corrosion rate of steel in concrete from the experimental date of polarization resistance [1]; Bertolini et al investigated the effect of stray current on the corrosion behaviour of steel in concrete with considering both corrosion initiation and propagation [2]; furthermore, Choi et al studied corrosion behaviour of steel bar embedded in concrete without fly ash and with fly ash under complete immersion in 3.5 wt.% NaCl solution [3]; Kapat et al presented the findings of an experimental investigation of potentiostatic study on reinforced steel in chloride contaminated concrete powder solution extracts [4]; Garcés et al studied the effect of different carbonaceous materials, which are added to concrete mixes, on the corrosion of steel bars in concrete [5]; and Ouglova et al dealt with elastic properties of iron oxides formed by corrosion in reinforced concrete structures [6]. In the studies for preventing corrosion of reinforced steel bars in concrete, Sawada et al introduced two organic bases (ethanolamine and guanidine) to act as corrosion inhibitors for the steel bars [7]; Fajardo et al studied electrochemical chloride extraction by means of cylindrical concrete specimens containing chlorides from ''artificial" seawater [8].…”

Section: Introductionmentioning

confidence: 99%

Damage evolution in cement mortar due to erosion of sulphate

2008

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a b s t r a c tUltrasonic technique is used to detect the velocity change of stress wave propagated in the cement mortar immersed in the solution of sodium sulfate for 425 days. Also the density change of specimens at different erosion time is measured. By curve fitting, the effect of solutions' concentration and water/cement ratio on the damage evolution is analyzed. The SEM observation on the growth of delayed ettringite is also performed. It shows that the damage evolution of specimens attacked by sulphate solution is dominantly induced by the nucleation and growth of delayed ettringite, and the average size of microvoids in cement mortar affects the damage evolution significantly.

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Corrosion behavior of steel bar embedded in fly ash concrete

Cited by 162 publications

References 13 publications

Effect of South African Quaternary Extenders on Early Compressive Strength

Effect of South African Quaternary Extenders on Early Compressive Strength

Durabilidad del hormigón armado expuesto a condiciones agresivas

Damage evolution in cement mortar due to erosion of sulphate

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