Tailored Montmorillonite nanoparticles and their behaviour in the alkaline cement environment

Juliana Calabria-Holley, Styliani Papatzani, Benjamin Naden, John Mitchels, Kevin Paine

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

This is the first time an analytical protocol is proposed to investigate and live-monitor the behaviour of montmorillonite nanoparticles, of different natures, in alkaline cement environment (pH of 12-13). In this study inorganic and organomodified montmorillonite nanoparticles were characterised via TEM, XRD, SEM-EDX and TGA. The inorganic montmorillonite used consisted of a purified montmorillonite commercially available as HPS-clay, and an organomodified montmorillonite, namely XDB-organoclay, consisted of purified montmorillonite modified with Noramonium MB2HT salt. Both montmorillonite nanoparticles were tailored to increase their compatibility with the hydrating cement environment. This gave rise to three different slurries: (i) reference-slurry, (ii) inorganic-slurry, and (iii) organic-slurry. The slurries were characterised and investigated through UV/vis, to measure suspension quality in terms of physical stability and rheological properties, and by AFM and FTIR to determine the chemical stability. The results indicated that the organic-slurry can offer a good stability, preventing aggregation of the clay particles at the targeted pH (13). The inorganic-slurry showed a reduction in surface charge and increased double layer repulsion. At pH 13 it was possible to obtain dispersion of the reference slurry although it underwent gelation and became viscous. The research findings informed that the inorganic slurry favours miscibility of the montmorillonite nanoparticles with cement particles and offers additional nucleation sites for CSH. Therefore it can be considered an alternative to organomodified montmorillonite as an addition in cement based materials.
Original languageEnglish
Pages (from-to)67-75
JournalApplied Clay Science
Volume143
Early online date17 Mar 2017
DOIs
Publication statusPublished - Jul 2017

Fingerprint

Bentonite
montmorillonite
Cements
cement
slurry
Nanoparticles
Slurries
organoclay
nanoparticle
clay
Organoclay
Chemical stability
Gelation
Surface charge
nucleation
transmission electron microscopy
Energy dispersive spectroscopy
Suspensions
Nucleation
Agglomeration

Keywords

  • inorganic and organomodified nanoclay particles, montmorillonite modification, pH, cement paste, AFM, TEM, XRD, SEM-EDX, TGA, UV/vis, rheology, surfactant

Cite this

Tailored Montmorillonite nanoparticles and their behaviour in the alkaline cement environment. / Calabria-Holley, Juliana; Papatzani, Styliani; Naden, Benjamin; Mitchels, John; Paine, Kevin.

In: Applied Clay Science, Vol. 143, 07.2017, p. 67-75.

Research output: Contribution to journalArticle

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