Studies on the compatibility of different superplasticizers with alkaline activators for low calcium geopolymer binders.
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| Title: | Studies on the compatibility of different superplasticizers with alkaline activators for low calcium geopolymer binders. |
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| Authors: | Partschefeld, Stephan1 (AUTHOR) stephan.partschefeld@uni-weimar.de, Tutal, Adrian1 (AUTHOR), Halmanseder, Thomas1 (AUTHOR), Osburg, Andrea1 (AUTHOR) |
| Source: | CE/Papers. Dec2023, Vol. 6 Issue 6, p484-490. 7p. |
| Subjects: | Sodium, Kaolin, Gel permeation chromatography, Calcium, Potassium silicate, Carbon emissions, Cement industries |
| Abstract: | The cement industry is coming into focus, as the annual production of around 4 Gt of cement is responsible for the emission of 1.5 Gt of CO2 and thus for over 8 % of anthropogenic CO2 emissions. This leads to the search for alternative binders. Such binders are calcined clays, which are available worldwide but vary greatly in their chemical and mineralogical composition. In many studies, particularly low‐calcium metakaolin is used as calcined clay, which reacts to form a low‐calcium aluminosilicate binder when mixed with a calcium‐free alkaline activator. The adjustment of the properties in the fresh state, especially regarding the consistency of these binders, is almost exclusively achieved by the addition of water, since commercially available superplasticizers are usually ineffective in low calcium geopolymer systems. The objective of this study was to investigate various PCE superplasticizers (MPEG‐, IPEG‐, HPEG‐PCE) with respect to their stability in different alkaline activators (NaOH, KOH, sodium, and potassium silicate solutions). The effectiveness of superplasticizers in low calcium geopolymer binders was verified by rheological tests. Size exclusion chromatography was used to investigate if structural degradation of the superplasticizers occurs. The investigated PCE superplasticizers showed no liquefying effect in the low calcium geopolymer system. This is due to a degradation process, i.e., the hydrolysis of the PEG side chains depending on the alkalinity of the activator. [ABSTRACT FROM AUTHOR] |
| Copyright of CE/Papers is the property of Wiley-Blackwell 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: 174033097 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Studies on the compatibility of different superplasticizers with alkaline activators for low calcium geopolymer binders. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Partschefeld%2C+Stephan%22">Partschefeld, Stephan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> stephan.partschefeld@uni-weimar.de</i><br /><searchLink fieldCode="AR" term="%22Tutal%2C+Adrian%22">Tutal, Adrian</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Halmanseder%2C+Thomas%22">Halmanseder, Thomas</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Osburg%2C+Andrea%22">Osburg, Andrea</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22CE%2FPapers%22">CE/Papers</searchLink>. Dec2023, Vol. 6 Issue 6, p484-490. 7p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Sodium%22">Sodium</searchLink><br /><searchLink fieldCode="DE" term="%22Kaolin%22">Kaolin</searchLink><br /><searchLink fieldCode="DE" term="%22Gel+permeation+chromatography%22">Gel permeation chromatography</searchLink><br /><searchLink fieldCode="DE" term="%22Calcium%22">Calcium</searchLink><br /><searchLink fieldCode="DE" term="%22Potassium+silicate%22">Potassium silicate</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+emissions%22">Carbon emissions</searchLink><br /><searchLink fieldCode="DE" term="%22Cement+industries%22">Cement industries</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The cement industry is coming into focus, as the annual production of around 4 Gt of cement is responsible for the emission of 1.5 Gt of CO2 and thus for over 8 % of anthropogenic CO2 emissions. This leads to the search for alternative binders. Such binders are calcined clays, which are available worldwide but vary greatly in their chemical and mineralogical composition. In many studies, particularly low‐calcium metakaolin is used as calcined clay, which reacts to form a low‐calcium aluminosilicate binder when mixed with a calcium‐free alkaline activator. The adjustment of the properties in the fresh state, especially regarding the consistency of these binders, is almost exclusively achieved by the addition of water, since commercially available superplasticizers are usually ineffective in low calcium geopolymer systems. The objective of this study was to investigate various PCE superplasticizers (MPEG‐, IPEG‐, HPEG‐PCE) with respect to their stability in different alkaline activators (NaOH, KOH, sodium, and potassium silicate solutions). The effectiveness of superplasticizers in low calcium geopolymer binders was verified by rheological tests. Size exclusion chromatography was used to investigate if structural degradation of the superplasticizers occurs. The investigated PCE superplasticizers showed no liquefying effect in the low calcium geopolymer system. This is due to a degradation process, i.e., the hydrolysis of the PEG side chains depending on the alkalinity of the activator. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of CE/Papers is the property of Wiley-Blackwell 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: 10.1002/cepa.2799 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 7 StartPage: 484 Subjects: – SubjectFull: Sodium Type: general – SubjectFull: Kaolin Type: general – SubjectFull: Gel permeation chromatography Type: general – SubjectFull: Calcium Type: general – SubjectFull: Potassium silicate Type: general – SubjectFull: Carbon emissions Type: general – SubjectFull: Cement industries Type: general Titles: – TitleFull: Studies on the compatibility of different superplasticizers with alkaline activators for low calcium geopolymer binders. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Partschefeld, Stephan – PersonEntity: Name: NameFull: Tutal, Adrian – PersonEntity: Name: NameFull: Halmanseder, Thomas – PersonEntity: Name: NameFull: Osburg, Andrea IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 12 Text: Dec2023 Type: published Y: 2023 Identifiers: – Type: issn-print Value: 25097075 Numbering: – Type: volume Value: 6 – Type: issue Value: 6 Titles: – TitleFull: CE/Papers Type: main |
| ResultId | 1 |
