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

Coudert, Elodie and Paris, Michael and Deneele, Dimitri and Russo, Giacomo and Tarantino, Alessandro (2019) Use of alkali activated high-calcium fly ash binder for kaolin clay soil stabilisation : physicochemical evolution. Construction and Building Materials, 201. 539–552. ISSN 0950-0618

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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.