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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Intercalation of Polycarboxylate Superplasticizers into C3A Hydrate Phases
Author(s): J. Plank, Z. Dai, N. Zouaoui, and D. Vlad
Publication: Special Publication
Appears on pages(s): 201-214
Keywords: cement hydration; intercalation; polycarboxylate; superplasticizer; tricalcium aluminate
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.
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