Date
2021-10-18Subject
660 Chemical engineering FluorochromeFlugascheHüttensandBetonherstellungHochfester BetonFluoreszenzmikroskopieMetadata
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Aufsatz
Adsorption of PCE in alkali-activated materials analysed by fluorescence microscopy
Abstract
The realisation of high-performance concrete mixtures requires the use of superplasticizers to achieve a low water/binder ratio and thus high strengths. Polycarboxylate ethers (PCE) are mostly used as superplasticizers. The effectiveness of these superplasticizers depends on their chemical structure, the binders’ alkaline environment and the ions present in the pore solution of the binder. In high alkaline systems like some alkali-activated materials no effective superplasticizer have been found yet. To unravel the compatibility of certain PCE to such a highly alkaline system a fluorescence microscopy approach was used. In first experiments, the adsorption of APEG (allyl ether) and MPEG (methacrylate) PCE on ground granulated blast furnace slag and fly ash was investigated varying the concentration of the activators. At a certain concentration, a complexation of the PCE can be recognised in fluorescence microscope. APEG shows a better stability compared to MPEG; this correlates with rheological investigations.
Citation
In: Journal of Microscopy Volume 286 / Issue 2 (2021-10-18) , S. 79-84 ; eissn:1365-2818Sponsorship
Gefördert im Rahmen des Projekts DEALCitation
@article{doi:10.17170/kobra-202204276101,
author={Wetzel, Alexander and Link, Janna and Middendorf, Bernhard},
title={Adsorption of PCE in alkali-activated materials analysed by fluorescence microscopy},
journal={Journal of Microscopy},
year={2021}
}
0500 Oax 0501 Text $btxt$2rdacontent 0502 Computermedien $bc$2rdacarrier 1100 2021$n2021 1500 1/eng 2050 ##0##http://hdl.handle.net/123456789/13986 3000 Wetzel, Alexander 3010 Link, Janna 3010 Middendorf, Bernhard 4000 Adsorption of PCE in alkali-activated materials analysed by fluorescence microscopy / Wetzel, Alexander 4030 4060 Online-Ressource 4085 ##0##=u http://nbn-resolving.de/http://hdl.handle.net/123456789/13986=x R 4204 \$dAufsatz 4170 5550 {{Fluorochrome}} 5550 {{Flugasche}} 5550 {{Hüttensand}} 5550 {{Betonherstellung}} 5550 {{Hochfester Beton}} 5550 {{Fluoreszenzmikroskopie}} 7136 ##0##http://hdl.handle.net/123456789/13986
2022-07-11T10:53:58Z 2022-07-11T10:53:58Z 2021-10-18 doi:10.17170/kobra-202204276101 http://hdl.handle.net/123456789/13986 Gefördert im Rahmen des Projekts DEAL eng Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ fluorochrome fly ash ground granulated blast furnace slag polycarboxylate ether staining 660 Adsorption of PCE in alkali-activated materials analysed by fluorescence microscopy Aufsatz The realisation of high-performance concrete mixtures requires the use of superplasticizers to achieve a low water/binder ratio and thus high strengths. Polycarboxylate ethers (PCE) are mostly used as superplasticizers. The effectiveness of these superplasticizers depends on their chemical structure, the binders’ alkaline environment and the ions present in the pore solution of the binder. In high alkaline systems like some alkali-activated materials no effective superplasticizer have been found yet. To unravel the compatibility of certain PCE to such a highly alkaline system a fluorescence microscopy approach was used. In first experiments, the adsorption of APEG (allyl ether) and MPEG (methacrylate) PCE on ground granulated blast furnace slag and fly ash was investigated varying the concentration of the activators. At a certain concentration, a complexation of the PCE can be recognised in fluorescence microscope. APEG shows a better stability compared to MPEG; this correlates with rheological investigations. open access Wetzel, Alexander Link, Janna Middendorf, Bernhard doi:10.1111/jmi.13066 Fluorochrome Flugasche Hüttensand Betonherstellung Hochfester Beton Fluoreszenzmikroskopie publishedVersion eissn:1365-2818 Issue 2 Journal of Microscopy 79-84 Volume 286 false
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