Amphoteric superplasticizers for cements blended with a calcined clay

Marlene Schmid, Nancy Beuntner, Karl Christian Thienel, Johann Plank

Research output: Contribution to journalConference articlepeer-review

12 Scopus citations

Abstract

In this study, the interaction between a calcined clay and novel, self-synthesized amphoteric superplasticizers was investigated. For this purpose, a natural crop of mixed layer clay was calcined at 750 °C in an industrial-scale rotary kiln and its particle size, chemical and mineralogical composition and electrokinetic behavior were determined. Specific amphoteric MPEG type polycarboxylate (PCE) copolymers holding carboxylate as well as quaternary ammonium functionalities were synthesized and characterized via gel permeation chromatography and specific charge amount measurements. Successful synthesis of amphoteric polymers was proven, and attractive dispersing properties were found in ordinary Portland cement (OPC) and an OPC/calcined clay blend, but not in individual calcined clay. Furthermore, the amphoteric polymers retard hydration of the cement/ calcined clay blend less than conventional anionic PCE polymers.

Original languageEnglish
Pages (from-to)41-54
Number of pages14
JournalAmerican Concrete Institute, ACI Special Publication
Volume2018-October
Issue numberSP 329
StatePublished - 2018
Externally publishedYes
Event12th International Conference on Superplasticizers and other Chemical Admixtures in Concrete, ICSP 2018 - Beijing, China
Duration: 28 Oct 201831 Oct 2018

Keywords

  • Blended cement
  • Calcined clay
  • Dispersing performance
  • Polycarboxylate ether, amphoteric polymer
  • Superplasticizer

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