Intercalation of polycarboxylate superplasticizers into C3A hydrate phases

Johann Plank, Zhimin Dai, Nadia Zouaoui, Dorina Vlad

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

24 Scopus citations

Abstract

Pure C3A hydrates under formation of layered phases (e.g. C4AH19 and C2AH8) which quickly convert to the cubic phase C3AH6. In presence of polycarboxylate (PC) superplasticizers during C3A hydration, intercalation of the PC molecule into the layered calcium aluminum hydrate occurs. The resulting organo mineral phases Ca-Al-PC-LDHs are very stable. They were characterized by powder XRD, elemental analysis, IR spectroscopy and TEM microscopy. XRD patterns show that with increasing side chain length (nEO) of PC, the distance (basal spacing) between the [Ca2Al(OH)6]+ layers increases. PCs with side chain lengths up to 45 ethylene oxide (EO) units intercalate well whereas a PC with 111 EO units no longer intercalates. Calculations indicate that the PC side chains mostly are compressed or tilted to fit in between the inorganic layers.

Original languageEnglish
Title of host publication8th CanMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete
EditorsV.M. Malhotra
PublisherAmerican Concrete Institute
Pages201-214
Number of pages14
ISBN (Electronic)9780870312168
StatePublished - 1 Oct 2006
Externally publishedYes
Event8th CanMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete - Sorrento, Italy
Duration: 29 Oct 20061 Nov 2006

Publication series

NameAmerican Concrete Institute, ACI Special Publication
VolumeSP-239
ISSN (Print)0193-2527

Conference

Conference8th CanMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete
Country/TerritoryItaly
CitySorrento
Period29/10/061/11/06

Keywords

  • Cement hydration
  • Intercalation
  • Polycarboxylate
  • Superplasticizer
  • Tricalcium aluminate

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