Meta-Analysis of PCE Structures as Dispersants in Cementitious Materials

Thomas Wagner, Tobias Lange, Torben Gädt

Publikation: Beitrag in Buch/Bericht/KonferenzbandKonferenzbeitragBegutachtung

Abstract

The structure-activity relationship of dispersants in cement was explored by conducting a meta-analysis of academic publications on PCE. Therefore, structural data of polycarboxylate ether (PCE) dispersants was collected from the academic literature together with the corresponding mini-slump data. The structures were summarized using the structural parameters P (the number of repeat units of the side chain), n (the number of repeat units in the backbone) and N (the number of monomers per repeat unit). It was found that the distribution of side chain length is multimodal, reflecting the availability of commercial macromonomers based on poly(ethylene glycol) (PEG). For the mean values, it was found P = 38.5, N = 4.7 and n = 24.3. The most frequently employed charge bearing monomers are acrylic acid, methacrylic acid and maleic acid. The main macromonomers are either based on methoxy poly(ethylene glycol) methacrylate, isoprenyl-poly(ethylene glycol) (IPEG), methallyl-PEG, or allyl-PEG. Additionally, rheology data from mini-slump tests containing these PCE was transformed into yield stress data. In an attempt to identify the most dosage efficient PCE structures, the yield stress data were compared with PCE structural descriptors and dosage. It was found that PCE with a P/N ratio between 6-12 and an adsorption constant between 10-100 show the highest dosage efficiency.

OriginalspracheEnglisch
TitelSuperplasticizers and Other Chemical Admixtures in Concrete - Conference Proceedings, 13th International Conference
Redakteure/-innenDenny Coffetti, Luigi Coppola, Terence Holland
Herausgeber (Verlag)American Concrete Institute
Seiten61-74
Seitenumfang14
ISBN (elektronisch)9781641951852
PublikationsstatusVeröffentlicht - 1 Juli 2022
Veranstaltung13th International Conference on Superplasticizers and Other Chemical Admixtures in Concrete - Milan, Italien
Dauer: 10 Juli 202213 Juli 2022

Publikationsreihe

NameAmerican Concrete Institute, ACI Special Publication
BandSP-354
ISSN (Print)0193-2527

Konferenz

Konferenz13th International Conference on Superplasticizers and Other Chemical Admixtures in Concrete
Land/GebietItalien
OrtMilan
Zeitraum10/07/2213/07/22

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