Interaction of Na2CO3 and Ca(OH)2 in aqueous system for mild activation of clay materials

Woo, C.L., Hanein, T. orcid.org/0000-0002-3009-703X, Nyberg, M. et al. (3 more authors) (Accepted: 2020) Interaction of Na2CO3 and Ca(OH)2 in aqueous system for mild activation of clay materials. In: 40th Cement and Concrete Science Conference Proceedings. 74th RILEM Annual Week and 40th Cement and Concrete Science Conference, 31 Aug - 04 Sep 2020, Online conference. University of Sheffield . (In Press)

Abstract

Alkali-activated calcined clay is a type of Alkali-activated materials which are generally activated with caustic chemicals such as NaOH, KOH, or alkali-silicate solutions. These chemicals are expensive and chemically aggressive; but, moderately alkaline Ca(OH)2/Na2CO3 solutions may offer an alternative to overcome the cost and aggressive nature of the activating solutions. In order to further develop the understanding of the moderate activation, this work investigates how Na2CO3 and Ca(OH)2 interact in the presence of water in various quantities. The solid are separated after their interaction and characterized by X-ray diffraction, Rietveld refinement and thermogravimetric analysis.