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Insights on the clay reactivity in alkaline media: Beyond filler role for kaolin
https://orcid.org/0000-0002-8671-0630
https://orcid.org/0000-0003-3332-7424
Abstract Beside lime and hydraulic binders, alkaline activation recently emerges as a possible solution for soil stabilisation. Unfortunately, soil reinforcement by alkaline activation requires additional reactive aluminosilicate sources under ambient temperature. In this study, we focus on kaolin as a simplified model of kaolin-rich soils which show limited improvement on mechanical performance after lime treatment. Here, we explore the reactivity of kaolin after a two-step process combining NaOH activation and sodium silicate solution activation. We show that kaolin reactivity is greatly enhanced compared to sodium silicate solution activation only. After the two-step process, the formed phases differ depending on the setup of the NaOH activation. More interestingly, for well chosen conditions, a large amount of highly depolymerized gel is created, which is expected to improve the mechanical performance of treated kaolin clay soils.
Highlights Raw kaolin reactivity in alkaline media is studied. Kaolin attack leads to the formation of different gels-types and zeolites. Sodium concentration influences the mineralogical sequence. A large amount of highly depolymerized gel is created. The contribution of kaolin goes beyond the simple role of mineral filler.
Insights on the clay reactivity in alkaline media: Beyond filler role for kaolin
https://orcid.org/0000-0002-8671-0630
https://orcid.org/0000-0003-3332-7424
Abstract Beside lime and hydraulic binders, alkaline activation recently emerges as a possible solution for soil stabilisation. Unfortunately, soil reinforcement by alkaline activation requires additional reactive aluminosilicate sources under ambient temperature. In this study, we focus on kaolin as a simplified model of kaolin-rich soils which show limited improvement on mechanical performance after lime treatment. Here, we explore the reactivity of kaolin after a two-step process combining NaOH activation and sodium silicate solution activation. We show that kaolin reactivity is greatly enhanced compared to sodium silicate solution activation only. After the two-step process, the formed phases differ depending on the setup of the NaOH activation. More interestingly, for well chosen conditions, a large amount of highly depolymerized gel is created, which is expected to improve the mechanical performance of treated kaolin clay soils.
Highlights Raw kaolin reactivity in alkaline media is studied. Kaolin attack leads to the formation of different gels-types and zeolites. Sodium concentration influences the mineralogical sequence. A large amount of highly depolymerized gel is created. The contribution of kaolin goes beyond the simple role of mineral filler.
Insights on the clay reactivity in alkaline media: Beyond filler role for kaolin
https://orcid.org/0000-0002-8671-0630
https://orcid.org/0000-0003-3332-7424
Abstract Beside lime and hydraulic binders, alkaline activation recently emerges as a possible solution for soil stabilisation. Unfortunately, soil reinforcement by alkaline activation requires additional reactive aluminosilicate sources under ambient temperature. In this study, we focus on kaolin as a simplified model of kaolin-rich soils which show limited improvement on mechanical performance after lime treatment. Here, we explore the reactivity of kaolin after a two-step process combining NaOH activation and sodium silicate solution activation. We show that kaolin reactivity is greatly enhanced compared to sodium silicate solution activation only. After the two-step process, the formed phases differ depending on the setup of the NaOH activation. More interestingly, for well chosen conditions, a large amount of highly depolymerized gel is created, which is expected to improve the mechanical performance of treated kaolin clay soils.
Highlights Raw kaolin reactivity in alkaline media is studied. Kaolin attack leads to the formation of different gels-types and zeolites. Sodium concentration influences the mineralogical sequence. A large amount of highly depolymerized gel is created. The contribution of kaolin goes beyond the simple role of mineral filler.
Insights on the clay reactivity in alkaline media: Beyond filler role for kaolin
Emmanuel, Emilie (author) / Paris, Michael (author) / Deneele, Dimitri (author)
Applied Clay Science ; 181
2019-07-07
Article (Journal)
Electronic Resource
English
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