The assessment of carbonation effect on chloride diffusion in concrete based on artificial neural network model

Delnavaz, Ali; Ramezanianpour, Ali Akbar

doi:10.1680/macr.11.00059

Cited by 30 publications

(12 citation statements)

References 16 publications

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“…Mix proportions and the type of admixtures significantly influence the diffusion coefficient of chloride ions. Several researchers conducted experiments to assess chloride ingress in combination with simultaneous carbonation [19][20][21][22][23][24][25][26][27][28][29][30]. The experimental outcomes showed that the chloride ion ingress is increased when the concrete is carbonized resulting in the higher release of chloride ions in the pore solution due to the reaction between Friedel's salt and carbon dioxide.…”

Section: Process Of Depassivation: Effect Of Chloride Ion Ingressmentioning

confidence: 99%

Influence of chloride threshold value in service life prediction of reinforced concrete structures

et al. 2018

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Extensive studies have been reported on the development of service-life prediction of reinforced concrete structures in the last two decades. Service life of a reinforced concrete structure is dependent on the corrosion process, specifically chloride threshold value. Chloride threshold value is a distinctive property and is dependent on several factors such as the supplementary cementitious material used, presence of surface cracks, water to binder ratio, type of steel reinforcement, exposure conditions, measurement methods, etc. Although chloride threshold value is an influential parameter in service-life prediction, a definitive chloride threshold value considering these factors is not reported in the existing literature and standards. Moreover, values adopted in many analytical tools for service life predictions based on the type of steel reinforcement alone are not appropriate and leads to inaccurate calculations. There is a gap in the available literature in understanding the selection of suitable chloride threshold values to be adopted for a specific system. Therefore, it is imperative to study the variation of chloride threshold value with exposure conditions as well as other influencing parameters, to achieve proper service life prediction. In the paper, several influencing parameters on chloride threshold value and its significance on prediction method are comprehensively reviewed. Moreover, suitable recommendations are highlighted for Indian and international standards at the later part of the study.

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Section: Process Of Depassivation: Effect Of Chloride Ion Ingressmentioning

confidence: 99%

Influence of chloride threshold value in service life prediction of reinforced concrete structures

et al. 2018

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“…Ingress of chlorides into the concrete can also take place through capillary action via cracks and continuous pores except in saturated concrete material. e rate of ingress of chloride is dependent on the cement type, age, w/c ratio, blended or neat OPC, porosity, binding ability of the chlorides, and the accompanying cation of the chlorides [21][22][23][24][25][26][27]. Ca 2+ and Mg 2+ show higher chloride diffusivity than Na + [28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Chloride Diffusivity in Blended Cement Made from Selected Industrial and Agrowastes

Wachira

Marangu

2019

Advances in Materials Science and Engineering

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This paper reports study findings on the diffusivity of chloride ions in potential blended cement. The cement, abbreviated as PCDC, was made from blending ordinary Portland cement (OPC) with dried calcium carbide residue and an incinerated mix of rice husks, spent bleaching earth, and broken bricks. The aim of the study was to investigate the ability of PCDC to withstand aggressive chloride environment. 10 cm × 10 cm mortar cubes were prepared using PCDC and cured for 28 days in saturated calcium hydroxide solution. The cured mortar cubes were subjected to aggressive chloride media in a laboratory set up. The test cement was subjected to chloride profile analysis with depth of cover as a function of w/c ratio and curing period in alternate dry and wet environments of 3.5 percent sodium chloride solution. The experiments were carried alongside neat OPC and OPC + 25% pulverised fuel ash (OPC + 25% PFA). Results showed that PCDC exhibited lower chloride ingress as the depth of cover increased. In conclusion, the study showed that PCDC was a potential cementitious material with high ability to withstand aggressive environment of chlorides.

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“…Many experiments have shown that the penetration of free chloride ions and moisture are influenced significantly by carbonation [34][35][36][37][38][39][40][41][42][43]. However, most chloride-and carbonation-induced corrosion is considered independently in all existing probabilistic analyses [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30], including the widely recognized FIB model code for service life design [44].…”

Section: Introductionmentioning

confidence: 99%

Probabilistic Generalization of a Comprehensive Model for the Deterioration Prediction of RC Structure under Extreme Corrosion Environments

et al. 2018

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In some extreme corrosion environments, the erosion of chloride ions and carbon dioxide can occur simultaneously, causing deterioration of reinforced concrete (RC) structures. This study presents a probabilistic model for the sustainability prediction of the service life of RC structures, taking into account that combined deterioration. Because of the high computational cost, we also present a series of simplifications to improve the model. Meanwhile, a semi-empirical method is also developed for this combined effect. By probabilistic generalization, this simplified method can swiftly handle the original reliability analysis which needs to be based on large amounts of data. A comparison of results obtained by the models with and without the above simplifications supports the significance of these improvements.

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The assessment of carbonation effect on chloride diffusion in concrete based on artificial neural network model

Cited by 30 publications

References 16 publications

Influence of chloride threshold value in service life prediction of reinforced concrete structures

Influence of chloride threshold value in service life prediction of reinforced concrete structures

Chloride Diffusivity in Blended Cement Made from Selected Industrial and Agrowastes

Probabilistic Generalization of a Comprehensive Model for the Deterioration Prediction of RC Structure under Extreme Corrosion Environments

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