Study on the interaction of Na-montmorillonite clay with polycarboxylates

Serina Ng, Johann Plank

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

9 Scopus citations

Abstract

The negative impact of sodium montmorillonite clay on dispersion effectiveness of two polycarboxylates consisting of methacrylate acid: MPEG methacrylate ester at molar ratios of 6:1 and 1.5:1 was investigated. When 1% by weight of cement (bwoc) of clay was present, cement spreads decreased by up to 60% while PCE sorption soared to ∼ 400 mg/g clay (∼ 100 times higher than on Portland cement). The PCEs mainly undergo chemisorption by intercalation between the alumosilicate layers via their poly(ethylene oxide) side chains. Additionally, to a minor extent (∼ 15%), adsorption via electrostatic attraction to the positively charged clay surfaces takes place. Polyglycols can be effectively used as a sacrificial agent to protect PCEs possessing high grafting density from the negative effects of clay, while more anionic PCEs benefit, however to a certain extent only, from the addition of highly anionic polyelectrolytes such as poly(methacrylic acid).

Original languageEnglish
Title of host publication10th International Conference on Superplasticizers and Other Chemical Admixtures 2012
Pages407-421
Number of pages15
Edition288 SP
StatePublished - 2012
Event10th International Conference on Superplasticizers and Other Chemical Admixtures 2012 - Prague, Czech Republic
Duration: 28 Oct 201231 Oct 2012

Publication series

NameAmerican Concrete Institute, ACI Special Publication
Number288 SP
ISSN (Print)0193-2527

Conference

Conference10th International Conference on Superplasticizers and Other Chemical Admixtures 2012
Country/TerritoryCzech Republic
CityPrague
Period28/10/1231/10/12

Keywords

  • Cement
  • Clay
  • Interaction
  • Montmorillonite
  • Polycarboxylate

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