Synthesis of dispersing agents from starch – Influence on rheological properties and early age hydration of OPC.
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| Title: | Synthesis of dispersing agents from starch – Influence on rheological properties and early age hydration of OPC. |
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| Authors: | Partschefeld, Stephan1 (AUTHOR), Osburg, Andrea1 (AUTHOR) |
| Source: | Construction & Building Materials. Apr2020, Vol. 240, pN.PAG-N.PAG. 1p. |
| Subjects: | Dispersing agents, Molecular structure, Hydration, Molecular weights, Chemical structure, Starch, Cornstarch |
| Abstract: | • The Influence of starch-based superplasticizers on rheological behaviour of OPC. • The Influence of starch-based superplasticizers on early age hydration of OPC. • The Investigations show that thickening admixtures can be produced from starch. • The Investigations show that liquefying admixtures can be produced from starch. • One key parameter is the molecular weight of the starch admixtures. • Another key parameter is the amount of anionic charges incorporated. • The early age hydration was strongly modified by the starch superplasticizers. • The dormant period is strongly prolonged by the starch superplasticizers. This study deals with the influence and effectivity of synthesized starch-based superplasticizers on rheological behaviour of cement pastes and on cement hydration. By varying molecular parameters, like molecular weight and the amount of introduced anionic charges, key parameters which induce thickening or liquefying behaviour in cement pastes were identified. Cement hydration was monitored by isothermal calorimetry, ultrasonic measurements and conductivity experiments. The investigations were supplemented by adsorption measurements by the phenol-sulphuric acid method. Results clearly show that low molecular weights and anionic charges in the molecular structure are necessary to create superplasticizers from starch. Also, the amount of anionic charges implemented in the molecular structure by chemical modification is a key parameter for a high dispersing performance. Furthermore, the starch-based superplasticizers delay the hydration of cement pastes, because of adsorption on cement surface, especially on the first hydration products. [ABSTRACT FROM AUTHOR] |
| Copyright of Construction & Building Materials is the property of Elsevier B.V. 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: 142393303 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Synthesis of dispersing agents from starch – Influence on rheological properties and early age hydration of OPC. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Partschefeld%2C+Stephan%22">Partschefeld, Stephan</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="%22Construction+%26+Building+Materials%22">Construction & Building Materials</searchLink>. Apr2020, Vol. 240, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Dispersing+agents%22">Dispersing agents</searchLink><br /><searchLink fieldCode="DE" term="%22Molecular+structure%22">Molecular structure</searchLink><br /><searchLink fieldCode="DE" term="%22Hydration%22">Hydration</searchLink><br /><searchLink fieldCode="DE" term="%22Molecular+weights%22">Molecular weights</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+structure%22">Chemical structure</searchLink><br /><searchLink fieldCode="DE" term="%22Starch%22">Starch</searchLink><br /><searchLink fieldCode="DE" term="%22Cornstarch%22">Cornstarch</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: • The Influence of starch-based superplasticizers on rheological behaviour of OPC. • The Influence of starch-based superplasticizers on early age hydration of OPC. • The Investigations show that thickening admixtures can be produced from starch. • The Investigations show that liquefying admixtures can be produced from starch. • One key parameter is the molecular weight of the starch admixtures. • Another key parameter is the amount of anionic charges incorporated. • The early age hydration was strongly modified by the starch superplasticizers. • The dormant period is strongly prolonged by the starch superplasticizers. This study deals with the influence and effectivity of synthesized starch-based superplasticizers on rheological behaviour of cement pastes and on cement hydration. By varying molecular parameters, like molecular weight and the amount of introduced anionic charges, key parameters which induce thickening or liquefying behaviour in cement pastes were identified. Cement hydration was monitored by isothermal calorimetry, ultrasonic measurements and conductivity experiments. The investigations were supplemented by adsorption measurements by the phenol-sulphuric acid method. Results clearly show that low molecular weights and anionic charges in the molecular structure are necessary to create superplasticizers from starch. Also, the amount of anionic charges implemented in the molecular structure by chemical modification is a key parameter for a high dispersing performance. Furthermore, the starch-based superplasticizers delay the hydration of cement pastes, because of adsorption on cement surface, especially on the first hydration products. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Construction & Building Materials is the property of Elsevier B.V. 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/j.conbuildmat.2019.117913 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Dispersing agents Type: general – SubjectFull: Molecular structure Type: general – SubjectFull: Hydration Type: general – SubjectFull: Molecular weights Type: general – SubjectFull: Chemical structure Type: general – SubjectFull: Starch Type: general – SubjectFull: Cornstarch Type: general Titles: – TitleFull: Synthesis of dispersing agents from starch – Influence on rheological properties and early age hydration of OPC. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Partschefeld, Stephan – PersonEntity: Name: NameFull: Osburg, Andrea IsPartOfRelationships: – BibEntity: Dates: – D: 20 M: 04 Text: Apr2020 Type: published Y: 2020 Identifiers: – Type: issn-print Value: 09500618 Numbering: – Type: volume Value: 240 Titles: – TitleFull: Construction & Building Materials Type: main |
| ResultId | 1 |
