Temperature dependence of the reactivity of cemented paste backfill.
Saved in:
| Title: | Temperature dependence of the reactivity of cemented paste backfill. |
|---|---|
| Authors: | Aldhafeeri, Z.1, Fall, M.1 mfall@uottawa.ca, Pokharel, M.1, Pouramini, Z.1 |
| Source: | Applied Geochemistry. Sep2016, Vol. 72, p10-19. 10p. |
| Subjects: | Paste, Oxygen consumption, X-ray absorption, Spectrometry, Geochemistry, Atomic absorption spectroscopy |
| Abstract: | The environmental performance of cemented paste backfill (CPB; a mixture of tailings, water and binder), which contains sulphide mineral-bearing tailings, is strongly influenced by its reactivity. However, our understanding of the reactivity of CPB under various thermal loading conditions as well as its evolution with time is limited. Hence, a laboratory investigation is conducted to study the effects of curing and ambient (atmospheric) temperatures on the reactivity of CPB. Oxygen consumption (OC) tests are conducted on CPB specimens cured at different temperatures to study their reactivity. Furthermore, microstructural analyses (e.g., x-ray diffraction (XRD), mercury intrusion porosimetry, and thermogravimetry/derivative thermogravimetry) are performed to assess the microstructural characteristics of the tested CPBs. The results show that the reactivity of CPB is temperature-dependent. As the curing temperature increases, the reactivity generally decreases. The reactivity is also affected by the ambient temperature. The reactivity increases as the atmospheric temperature increases. However, the extent of the effect of the temperature depends on the curing time and is generally more pronounced at the early ages. Furthermore, the presence of sulphate in the pore water of CPB can significantly affect the reactivity of CPB cured at high temperatures (50 °C). The findings of this study will therefore help to better assess and predict the environmental behavior of CPB under various field thermal conditions. [ABSTRACT FROM AUTHOR] |
| Copyright of Applied Geochemistry is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
|---|---|
| Header | DbId: egs DbLabel: Engineering Source An: 117735375 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
| IllustrationInfo | |
| Items | – Name: Title Label: Title Group: Ti Data: Temperature dependence of the reactivity of cemented paste backfill. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Aldhafeeri%2C+Z%2E%22">Aldhafeeri, Z.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Fall%2C+M%2E%22">Fall, M.</searchLink><relatesTo>1</relatesTo><i> mfall@uottawa.ca</i><br /><searchLink fieldCode="AR" term="%22Pokharel%2C+M%2E%22">Pokharel, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Pouramini%2C+Z%2E%22">Pouramini, Z.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Applied+Geochemistry%22">Applied Geochemistry</searchLink>. Sep2016, Vol. 72, p10-19. 10p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Paste%22">Paste</searchLink><br /><searchLink fieldCode="DE" term="%22Oxygen+consumption%22">Oxygen consumption</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+absorption%22">X-ray absorption</searchLink><br /><searchLink fieldCode="DE" term="%22Spectrometry%22">Spectrometry</searchLink><br /><searchLink fieldCode="DE" term="%22Geochemistry%22">Geochemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Atomic+absorption+spectroscopy%22">Atomic absorption spectroscopy</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The environmental performance of cemented paste backfill (CPB; a mixture of tailings, water and binder), which contains sulphide mineral-bearing tailings, is strongly influenced by its reactivity. However, our understanding of the reactivity of CPB under various thermal loading conditions as well as its evolution with time is limited. Hence, a laboratory investigation is conducted to study the effects of curing and ambient (atmospheric) temperatures on the reactivity of CPB. Oxygen consumption (OC) tests are conducted on CPB specimens cured at different temperatures to study their reactivity. Furthermore, microstructural analyses (e.g., x-ray diffraction (XRD), mercury intrusion porosimetry, and thermogravimetry/derivative thermogravimetry) are performed to assess the microstructural characteristics of the tested CPBs. The results show that the reactivity of CPB is temperature-dependent. As the curing temperature increases, the reactivity generally decreases. The reactivity is also affected by the ambient temperature. The reactivity increases as the atmospheric temperature increases. However, the extent of the effect of the temperature depends on the curing time and is generally more pronounced at the early ages. Furthermore, the presence of sulphate in the pore water of CPB can significantly affect the reactivity of CPB cured at high temperatures (50 °C). The findings of this study will therefore help to better assess and predict the environmental behavior of CPB under various field thermal conditions. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Applied Geochemistry is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=117735375 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.apgeochem.2016.06.005 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 10 StartPage: 10 Subjects: – SubjectFull: Paste Type: general – SubjectFull: Oxygen consumption Type: general – SubjectFull: X-ray absorption Type: general – SubjectFull: Spectrometry Type: general – SubjectFull: Geochemistry Type: general – SubjectFull: Atomic absorption spectroscopy Type: general Titles: – TitleFull: Temperature dependence of the reactivity of cemented paste backfill. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Aldhafeeri, Z. – PersonEntity: Name: NameFull: Fall, M. – PersonEntity: Name: NameFull: Pokharel, M. – PersonEntity: Name: NameFull: Pouramini, Z. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 09 Text: Sep2016 Type: published Y: 2016 Identifiers: – Type: issn-print Value: 08832927 Numbering: – Type: volume Value: 72 Titles: – TitleFull: Applied Geochemistry Type: main |
| ResultId | 1 |
