Crack Detection Method Applied to 3D Computed Tomography Images of Baked Carbon Anodes

Picard, Donald; Lauzon-Gauthier, Julien; Duchesne, Carl; Alamdari, Houshang; Fafard, Mario; Ziegler, Donald

doi:10.3390/met6110272

Cited by 4 publications

(2 citation statements)

References 23 publications

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“…Another method that takes advantage of the narrow shape characteristics of cracks is a Hessian-based approach [ 35 , 36 ], which identifies regions that exhibit sharp changes in image intensity. Percolation methods have also shown significant promise in detecting cracks across a range of materials [ 37 ]. These methods leverage the fact that most cracks are continuous, narrow objects with relatively consistent (low) density.…”

Section: Introductionmentioning

confidence: 99%

Detection and Quantification of Cracking in Concrete Aggregate through Virtual Data Fusion of X-Ray Computed Tomography Images

2020

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In this work, which is part of a larger research program, a framework called “virtual data fusion” was developed to provide an automated and consistent crack detection method that allows for the cross-comparison of results from large quantities of X-ray computed tomography (CT) data. A partial implementation of this method in a custom program was developed for use in research focused on crack quantification in alkali-silica reaction (ASR)-sensitive concrete aggregates. During the CT image processing, a series of image analyses tailored for detecting specific, individual crack-like characteristics were completed. The results of these analyses were then “fused” in order to identify crack-like objects within the images with much higher accuracy than that yielded by any individual image analysis procedure. The results of this strategy demonstrated the success of the program in effectively identifying crack-like structures and quantifying characteristics, such as surface area and volume. The results demonstrated that the source of aggregate has a very significant impact on the amount of internal cracking, even when the mineralogical characteristics remain very similar. River gravels, for instance, were found to contain significantly higher levels of internal cracking than quarried stone aggregates of the same mineralogical type.

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Section: Introductionmentioning

confidence: 99%

Detection and Quantification of Cracking in Concrete Aggregate through Virtual Data Fusion of X-Ray Computed Tomography Images

2020

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“…Picard et al [7] investigated the possibility of application of X-ray computed tomography, as a non-destructive testing method, for detecting cracks in baked anodes. Cracks may be initiated during the anode-forming step, due to the release of induced stresses, or during the baking step, due to the pitch devolatilisation and gas generation [8].…”

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confidence: 99%

Aluminium Production Process: Challenges and Opportunities

Alamdari

2017

Metals

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Aluminium, with more than 50 Mt annual production in 2016, is an essential material in modern engineering designs of lightweight structures. To obtain aluminium ingots from bauxite, three main processes are involved: the Bayer process to produce alumina from bauxite; the anode manufacturing process to produce electrodes, and the smelting process using the Hall-Héroult technology. The Hall-Héroult process, involves the electrolysis of alumina, dissolved in molten cryolite to produce liquid aluminium that should be casted to produce ingots of different types of alloys. The technology is now about 130 years old and the aluminium production experienced a phenomenal growth during the past two decades-the highest growth rate for a commodity metal. The aluminium electrolysis cell is made of a steel shell, the internal surfaces of which are covered with a series of insulating linings made of refractory materials. The top lining, made of carbon, is in direct contact with the molten metal and acts as the cathode. The anode is also made of carbon, suspended in the electrolyte and consumed during electrolysis. According to the International Aluminium Institute [1] the energy required to produce one ton of aluminium varies between 12.8 and 16 MWh, depending on the technology used and the age of the smelters. Carbon consumption of the process-roughly about 400 kg of carbon for tone of aluminium-is also significant, contributing to the generation of about 1.5 tons of CO 2 per ton of aluminium. Thus energy efficiency and the environmental footprint of the process are the top concerns of this industry.Major aluminium producers and scientists gather once a year during ICSOBA "The International Committee for Study of Bauxite, Alumina and Aluminium" [2] in order to share the challenges of the industry and the latest technological and scientific progresses. The scope of the event covers the whole Al production chain, from bauxite refining to aluminium electrolysis, including electrode manufacturing and aluminium smelting processes. This Special Issue was launched to publish selected works presented at this event, in order to disseminate the recent progress and new achievements in this emerging field with broader scientific and industrial communities. The submitted papers mostly focus on carbon technology for aluminium smelting, dealing with different issues related with carbon consumption and its environmental impact.Allard et al.[3] presented a new generation of eco-friendly ramming paste. In an electrolysis cell, ramming paste, composed of calcined anthracite and coal-tar-pitch binder, is used to seal the seams between cathode blocks and the joints between the cathode lining and the cell walls. Installation of ramming paste is always challenging, implying special precautions for health and environmental issues, basically due to the polycyclic aromatic hydrocarbons (PAH) and volatile organic compounds (VOC) emissions. The authors extensively characterized 5 eco-friendly ramming pastes and reported their physico-chemical properties....

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Acousto-Ultrasonic Inspection of Pre-baked Carbon Anodes: Repeatability Analysis and Assessment of Damage Detection Performance

Rodrigues,

Picard,

Duchesne

et al. 2023

J Nondestruct Eval

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Crack Detection Method Applied to 3D Computed Tomography Images of Baked Carbon Anodes

Cited by 4 publications

References 23 publications

Detection and Quantification of Cracking in Concrete Aggregate through Virtual Data Fusion of X-Ray Computed Tomography Images

Detection and Quantification of Cracking in Concrete Aggregate through Virtual Data Fusion of X-Ray Computed Tomography Images

Aluminium Production Process: Challenges and Opportunities

Acousto-Ultrasonic Inspection of Pre-baked Carbon Anodes: Repeatability Analysis and Assessment of Damage Detection Performance

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