Dedolomitization in different alkaline media: Application to Portland cement paste
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| Title: | Dedolomitization in different alkaline media: Application to Portland cement paste |
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| Authors: | García, E. engarcia@natura.geo.ub.es, Alfonso, P.1, Labrador, M.1, Galí, S.1 |
| Source: | Cement & Concrete Research. Sep2003, Vol. 33 Issue 9, p1443. 6p. |
| Subjects: | Dolomite, Alkali lands, Dynamics |
| Abstract: | The dedolomitization reaction kinetics is studied through several long-term experiments consisting of an aqueous dispersion of fine powders of dolomite and portlandite with alkalinity between 0.1 and 1 M KOH, at 25 and 75 °C. The experimental results are numerically simulated to calculate the apparent dissolution constant rates for dolomite, kdol. At low temperature, two dissolution stages were observed. In an early stage, part of dolomite powder dissolves quickly until an apparent steady is reached. After several days, the reaction continues at a lower rate. The calculated dissolution rate for dolomite in the first stage is one order of magnitude higher than that of the second stage. At 75 °C, the kdol is two orders of magnitude higher than at 25 °C. The addition of alkali increases the kdol at high temperature, but reduces it at room temperature. [Copyright &y& Elsevier] |
| Copyright of Cement & Concrete Research 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 |
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| Header | DbId: egs DbLabel: Engineering Source An: 10568786 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Dedolomitization in different alkaline media: Application to Portland cement paste – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22García%2C+E%2E%22">García, E.</searchLink><i> engarcia@natura.geo.ub.es</i><br /><searchLink fieldCode="AR" term="%22Alfonso%2C+P%2E%22">Alfonso, P.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Labrador%2C+M%2E%22">Labrador, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Galí%2C+S%2E%22">Galí, S.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Cement+%26+Concrete+Research%22">Cement & Concrete Research</searchLink>. Sep2003, Vol. 33 Issue 9, p1443. 6p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Dolomite%22">Dolomite</searchLink><br /><searchLink fieldCode="DE" term="%22Alkali+lands%22">Alkali lands</searchLink><br /><searchLink fieldCode="DE" term="%22Dynamics%22">Dynamics</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The dedolomitization reaction kinetics is studied through several long-term experiments consisting of an aqueous dispersion of fine powders of dolomite and portlandite with alkalinity between 0.1 and 1 M KOH, at 25 and 75 °C. The experimental results are numerically simulated to calculate the apparent dissolution constant rates for dolomite, kdol. At low temperature, two dissolution stages were observed. In an early stage, part of dolomite powder dissolves quickly until an apparent steady is reached. After several days, the reaction continues at a lower rate. The calculated dissolution rate for dolomite in the first stage is one order of magnitude higher than that of the second stage. At 75 °C, the kdol is two orders of magnitude higher than at 25 °C. The addition of alkali increases the kdol at high temperature, but reduces it at room temperature. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Cement & Concrete Research 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.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/S0008-8846(03)00095-4 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 6 StartPage: 1443 Subjects: – SubjectFull: Dolomite Type: general – SubjectFull: Alkali lands Type: general – SubjectFull: Dynamics Type: general Titles: – TitleFull: Dedolomitization in different alkaline media: Application to Portland cement paste Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: García, E. – PersonEntity: Name: NameFull: Alfonso, P. – PersonEntity: Name: NameFull: Labrador, M. – PersonEntity: Name: NameFull: Galí, S. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 09 Text: Sep2003 Type: published Y: 2003 Identifiers: – Type: issn-print Value: 00088846 Numbering: – Type: volume Value: 33 – Type: issue Value: 9 Titles: – TitleFull: Cement & Concrete Research Type: main |
| ResultId | 1 |
