Use of alkali activated high-calcium fly ash binder for kaolin clay soil stabilisation: physicochemical evolution

Elodie Coudert, Michael Paris, Dimitri Deneele, Giacomo Russo, Alessandro Tarantino

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Abstract

This study addresses the use of alkali activated high-calcium fly ash-based binder to improve engineering characteristics of soft clay-rich soils as an alternative to common stabilisers. The physico-chemical reaction sequence has been investigated by considering the binder alone and the binder mixed with kaolin. An insight into the reactivity evidenced that calcium-containing phases derived from high-calcium fly ash represent the reactive phases and, hence, pozzolanic activity is the dominant process. New compounds are formed, thenardite Na2SO4 and an amorphous silicate consisting of chains combined with calcium probably incorporating three-dimensional four-fold aluminium environments.
Original languageEnglish
Pages (from-to)539–552
Number of pages14
JournalConstruction and Building Materials
Volume201
Early online date7 Jan 2019
DOIs
Publication statusPublished - 20 Mar 2019

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Keywords

  • soil stabilisation
  • alkali activated material
  • kaolin
  • high-calcium fly ash

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