Effect of red mud addition on the corrosion parameters of reinforced concrete evaluated by electrochemical methods

Ribeiro, Daniel Véras; Labrincha, J.A.; Morelli, M. R.

doi:10.1590/s1983-41952012000400004

Cited by 21 publications

(14 citation statements)

References 14 publications

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“…An outer area of about 825cm² of the concrete samples immersed in 3.5% NaCl solution was exposed to direct chloride attack and their upper parts (~ 10 cm) were above the salt water level as shown in Fig.3. The corrosion potential is basically an indirect indication of the corroded state of the concrete embedded steel rebars and being verified by many previous chlorideactivated accelerated corrosion tests [13]. In our case the electrochemical cell used for corrosion potential measurements was composed of the working electrodes (i.e.…”

Section: B-corrosion Potential Measurementssupporting

confidence: 61%

Measurements and studying corrosion potential of reinforced concrete samples prepared with and without a green inhibitor and immersed in 3.5%NaCl solution

Abdulsada¹,

Törók²

2018

The Publications of the MultiScience - XXXII. MicroCAD International Scientific Conference

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In recent years the use of inhibitors in producing high performance concrete has increased significantly as a result of chloride and sulphate attacks. The effectiveness of an organic inhibitor extracted from a cheap organic waste of orange peel (so-called "green" inhibitor) was added to the fresh concrete. Two types of superplasticizers (Mapei Dynamon SR 31 and Oxydtron) were also used to reduce the water during concrete hardening. Then the concrete samples were immersed partially in 3.5%NaCl aqueous solutions for six months and every two weeks the corrosion potentials of the samples were regularly measured against a saturated calomel electrode. Results showed that the samples with Oxydtron had better ability to resist corrosion than the samples prepared with Mapei Dynamon SR 31, and samples with green inhibitor had less negative corrosion potentials (and even less with increasing concentration of inhibitor) than that of the reference sample (0% inhibitor).

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Section: B-corrosion Potential Measurementssupporting

confidence: 61%

Measurements and studying corrosion potential of reinforced concrete samples prepared with and without a green inhibitor and immersed in 3.5%NaCl solution

Abdulsada¹,

Törók²

2018

The Publications of the MultiScience - XXXII. MicroCAD International Scientific Conference

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“…Regarding the durability of structures, the entry of chlorides in concrete, which brings as a consequence the serious problems of corrosion of steel reinforcement, occurs essentially by three transport mechanisms: absorption, permeability and diffusion, occurring solely or in combination [13][14][15][16][17]. There is still a fourth mechanism of transport, the ionic migration [13,14,[18][19][20], motivated by applied external electric fields, however this mechanism is rather unlikely in service situations, but it is present on accelerated methods of chloride penetration or to determine the apparent diffusion coefficient in migration tests [21]. Diffusion is then considered as the main transport process of chlorine ions into the concrete.…”

Section: Introductionmentioning

confidence: 99%

O papel do metacaulim na proteção dos concretos contra a ação deletéria de cloretos

Figueiredo

Santos

Cascudo

et al. 2014

Rev. IBRACON Estrut. Mater.

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O objetivo deste trabalho é avaliar a capacidade de proteção de concretos produzidos com metacaulim em relação ao transporte e penetração de cloretos. Para tanto, a partir de um concreto comercial de fck igual a 30 MPa, foram produzidos mais dois concretos substituindo-se 10% da massa de cimento por metacaulim, a saber: em um dos concretos manteve-se a mesma relação água/aglomerante do traço inicial de referência (a/ag = 0,60) e no outro manteve-se fixa a resistência à compressão. Em todas as três dosagens foi mantida a mesma faixa de consistência do concreto, com abatimento igual a (100 + 10) mm. A frente de cloretos na matriz cimentícia foi avaliada por meio da aspersão de solução de nitrato de prata, após ataque de 8 ciclos semanais de molhagem e secagem em solução contendo cloretos. Foram, então, realizadas avaliações da porosidade aberta, a partir do ensaio de absorção de água por imersão, para se ter um indicativo da estrutura interna dos concretos, assim como se procederam análises de DRX e MEV em amostras de concreto. Estes estudos objetivaram verificar as potencialidades do metacaulim na fixação de cloretos na forma de sal de Friedel, além de propiciar as análises microestruturais dos concretos. Concluiu-se com o trabalho que a incorporação de metacaulim diminui a difusividade de cloretos, na medida em que essa adição mineral produz refinamento da estrutura de poros do concreto e também porque ela induz à formação de sal de Friedel, o que a torna um agente eficaz na prevenção da corrosão das armaduras em ambientes ricos em cloretos.

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“…Electrical resistivity is a property widely used to monitor concrete structures because it is a nondestructive method and allows for external monitoring by means of embedded electrodes. This property is fundamentally related to fluid permeability and to ion diffusivity through concrete pores 22 . (150 × 150 × 150 mm 3 ) concrete cube reinforced with three (8 mm diameter) longitudinal wires.…”

Section: Methodsmentioning

confidence: 99%

“…This property is fundamentally related to fluid permeability and to ion diffusivity through concrete F I G U R E 4 Porosity by vacuum saturation pores. 22 (150 × 150 × 150 mm 3 ) concrete cube reinforced with three (8 mm diameter) longitudinal wires. The three bars of reinforced concrete samples are arranged as equal leg triangular with 8 cm leg length as shown in Figure 7.…”

Section: Electrical Resistivity Measurementmentioning

confidence: 99%

Studying chloride ions and corrosion properties of reinforced concrete with a green inhibitor and plasticizers

Abdulsada

Törók

2020

Structural Concrete

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The breakthrough and diffusion of chloride ions into reinforced concrete structures is the major contributing factor for inducing corrosion of the steel reinforcement. This work presents a study of the total chloride contents in concrete and the corrosion process by testing electrical resistivity and half-cell potential of concrete samples. The novelty of this work in the use of a green inhibitor-orange peel extract. The analysis was based on an experimental investigation of the samples with time of immersion in 3.5 wt% NaCl aqueous solutions at room temperature according to European Standards. For this study, different mixtures of concrete were prepared by adding two types of superplastisizers and green inhibitors in different concentrations. The results of the Cl − ions test showed that all the samples (except sample C2) after an immersion testing period of 6 months contained Cl − ions in high concentrations, indicating a greater risk of corrosion. Sample C2 (with green inhibitor and Oxydtron superplasticizer) showed the highest resistance against the chloride ion ingress measured by following the Cl − concentration changes up to the end of the 6 months testing period. This samples' good resistance to corrosion in the tested environment was also proved by the results of several sets of measurements of the electrical resistivity and half-cell potentials carried on the concrete test samples.

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Effect of red mud addition on the corrosion parameters of reinforced concrete evaluated by electrochemical methods

Cited by 21 publications

References 14 publications

Measurements and studying corrosion potential of reinforced concrete samples prepared with and without a green inhibitor and immersed in 3.5%NaCl solution

Measurements and studying corrosion potential of reinforced concrete samples prepared with and without a green inhibitor and immersed in 3.5%NaCl solution

O papel do metacaulim na proteção dos concretos contra a ação deletéria de cloretos

Studying chloride ions and corrosion properties of reinforced concrete with a green inhibitor and plasticizers

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