Effects of different polycarboxylate ether structures on the rheology of alkali-activated slag binders

Kashani, Alireza, Provis, John L., Xu, Jiangtao, Kilcullen, Adam, Duxson, Peter, Qiao, Greg G. and van Deventer, Jannie S. J. (2012). Effects of different polycarboxylate ether structures on the rheology of alkali-activated slag binders. In: V. M. Malhotra, Tenth International Conference on Superlasticizers and Other Chemical Admixtures 2012. 10th International Conference on Superplasticizers and Other Chemical Admixtures 2012, Prague, Czech Republic, (279-289). 28-31 October, 2012. doi:10.14359/51684235


Author Kashani, Alireza
Provis, John L.
Xu, Jiangtao
Kilcullen, Adam
Duxson, Peter
Qiao, Greg G.
van Deventer, Jannie S. J.
Title of paper Effects of different polycarboxylate ether structures on the rheology of alkali-activated slag binders
Conference name 10th International Conference on Superplasticizers and Other Chemical Admixtures 2012
Conference location Prague, Czech Republic
Conference dates 28-31 October, 2012
Convener American Concrete Institute (ACI)
Proceedings title Tenth International Conference on Superlasticizers and Other Chemical Admixtures 2012   Check publisher's open access policy
Series ACI Special Publication
Place of Publication Farmington Hills, MI, United States
Publisher American Concrete Institute
Publication Year 2012
Sub-type Fully published paper
DOI 10.14359/51684235
Open Access Status DOI
ISBN 9781622766406
9780870317750
ISSN 0193-2527
Editor V. M. Malhotra
Volume 288
Issue SP
Start page 279
End page 289
Total pages 11
Language eng
Formatted Abstract/Summary
Polycarboxylate ether (PCE) admixtures are generally used in concrete at rela¬tively low concentrations, enabling the reduction of mixture cost and enhanced flow prop¬erties due to reduction of cement content and significant enhancement of rheology, respec¬tively. However, typical PCE polymer structures that are used in Portland cement have little or no effect on alkali activated slag (AAS) binder rheology due to ineffective consump¬tion of polymer by a number of mechanisms, including degradation of the polymer chains within the high alkaline environments present in AAS systems. In this study, a range of PCEs with long and moderate PolyEthyleneGlycol (PEG) side chain lengths, and with high and low molecular weights (Mn), are examined. Co-polymers containing a higher density of backbone charges, as is typical for a Portland cement superplasticiser, increase the yield stress of alkali-activated slag. A co-polymer with longer side chains and lower Mn show a yield stress reduction, indicating a mild increase in workability compared to an unmodified AAS paste. It is suggested that in the high ionic strength environment of an AAS binder, a more charged polymer is consumed through interactions with other ions and charged particles, which can bring an increase in yield stress and plastic viscosity of AAS.
Subjects 2205 Civil and Structural Engineering
2215 Building and Construction
2500 Materials Science
Keyword Admixtures
Alkali-activated slag
Plasticizer
Polycarboxylate
Rheology
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Conference Paper
Collection: School of Chemistry and Molecular Biosciences
 
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