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Record W6991860804

Investigation de l'effet de la muscovite libre dans les résidus miniers sur la consistance et les propriétés rhéologiques des remblais miniers en pâte cimentés

2024· other· fr· W6991860804 on OpenAlexfundno aff

Bibliographic record

VenuePolyPublie (École Polytechnique de Montréal) · 2024
Typeother
Languagefr
FieldEngineering
TopicMaterials Engineering and Processing
Canadian institutionsnot available
FundersFonds de recherche du Québec – Nature et technologiesIAMGOLD
KeywordsMuscoviteStatistical analysis
DOInot available

Abstract

fetched live from OpenAlex

RÉSUMÉ: « RÉSUMÉ : La présence de muscovite libre dans les résidus miniers peut impacter négativement la résistance mécanique et les propriétés rhéologiques des remblais en pâte cimentés, comme observé dans d'autres matériaux cimentaires. Cette étude vise à évaluer l'impact de la teneur en muscovite des résidus sur la consistance et la rhéologie des remblais en pâte cimentés (RPC). Des mélanges de RPC ont été préparés à partir de deux types de résidus (RW et RL) avec des pourcentages solides compris entre 69% et 74%. L'étude de l'influence de la muscovite s'est appuyée sur l'incorporation de muscovite libre pure allant de 14% à 25% dépendamment de la teneur initiale dans chaque résidus miniers. Ces mélanges ont été cimentés avec 5% de liant binaire GU (ciment Portland à usage général)/Slag(scories) (20/80). De plus, d’autres mélanges de RPC ont été confectionnés cette fois-ci avec 5% de ciment HE dans l’intérêt de comparé l’effet du type de liant. Dans ce cas, les teneurs de la muscovite amendée vont de 15% à 19% pour un seul type de résidus minier. Aussi, des pâtes de muscovite pure seule et cimentée ont été élaborées afin d’étudier le minéral problématique isolé du système. Ces pâtes monominérales comportent des pourcentages solides variés, allant de 68% à 76% et des P20μm qui varient de 31% à 63%. Des essais d'affaissement au cône d'Abrams et des analyses rhéologiques ont été réalisés pour chaque mélange de RPC. Les résultats indiquent une réduction de la hauteur d'affaissement ainsi qu'une augmentation du seuil de cisaillement et de l'indice d'écoulement de Herschel-Bulkley et de la viscosité au taux de cisaillement infini de Cross, avec l'augmentation de la teneur en muscovite dans le RPC pour un pourcentage solide donné. Par conséquent, une augmentation de la quantité d'eau doit être envisagée pour maintenir la fluidité requise du remblai en pâte cimenté, ce qui augmente le rapport eau-liant et peut affecter la résistance mécanique.» ABSTRACT: « ABSTRACT : The presence of free muscovite in mine tailings can have a negative effect on the mechanical strength and rheological properties of cement paste backfill, as observed in other cementitious materials. The objective of this study was to evaluate the effect of muscovite content in mine tailings on the consistency and rheology of cemented paste backfill (CPB). CPB mixes were prepared from two types of tailings (RW and RL) with solids contents ranging from 69% to 74%. The study of the influence of muscovite was based on the incorporation of pure free muscovite ranging from 14% to 25% depending on the initial muscovite content of each tailing. These mixes were cemented with 5% GU (general uses Portland cement)/slag (20/80) binary binder. In addition, more CPB mixes were made, this time with 5% HE cement, to compare the effect of the type of binder on the rheological behavior of CPB. In this case, grades of modified muscovite ranged from 15% to 19% for one type of tailings. Pure muscovite alone and cemented pastes were also prepared to investigate the problem mineral isolated from the system. These monomineral pastes had varying solids contents ranging from 68% to 76% and P20μm ranging from 31% to 63%. Abrams cone slump tests and rheological analyses were carried out on each CPB mixture. The results show a decrease in slump height as well as an increase in Herschel-Bulkley yield stress and flow index and Cross infinite shear rate viscosity with increasing muscovite content in the CPB for a given solids content. Therefore, an increase in the amount of water must be considered to maintain the required fluidity of CPB. An increase in the water/binder ratio may affect the mechanical strength of CPB. A method is presented for determining the amount of cement to be incorporated into the CPB in order to maintain the water/binder ratio of the original cemented paste backfill recipe. Furthermore, the same trends in paste rheology are observed when the type of binder is varied. In the case of pure muscovite pastes, the yield stress and viscosity are directly proportional to the solids content, but inversely proportional to the fine particle content. The presence of 5% GU/slag in pure muscovite caused a significant increase in the yield stress.»

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

How this classification was reachedexpand

Full frame machine prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.000
Version: metacan-v3-hybrid-931329e0061cValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Bench or experimental · Consensus signal: Bench or experimental
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.002
Threshold uncertainty score0.007

Distilled classifier scores by category (both heads)

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0000.000
Science and technology studies0.0000.000
Scholarly communication0.0000.000
Open science0.0000.000
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0020.000

Machine scores (provisional)

The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.

Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.

Opus teacher head0.011
GPT teacher head0.235
Teacher spread0.224 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it

Classification

machine, unvalidated

Machine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.

The models applied no category: nothing in the taxonomy fit this work.
Study designBench or experimental
Domainnot available
GenreEmpirical

How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".

Quick stats

Citations0
Published2024
Admission routes1
Has abstractyes

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