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Effect of the Formulation of Sodium Activation Solutions on the Setting Time of Metakaolin Based Geopolymers



Author(s)

Lahlou Nouha¹, Ouazzani Touhami Mohamed¹, Moussa Redouane² and Hattaf Rabii²

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DOI:10.17265/2161-6221/2019.1-2.002

1. Faculté des Sciences Aïnchock, Université HassanII, Laboratoire de Mécanique, Casablanca 20000, Maroc
2. Faculté des Sciences Aïnchock, Université HassanII, Laboratoire de Physico-Chimie des Matériaux Inorganiques, Casablanca 20000, Maroc

Geopolymer materials today represent innovative products, used frequently as a substitute for cementitious traditional materials. They are obtained by the action of an alkaline activation solution (composed of mainly of silicon dioxide (SiO₂) and sodium hydroxide (NaOH) and water) on a powder natural or synthetic aluminosilicates. In this work, we seek to highlight the effect of the percentage of sodium dioxide firstly, on the evolution of the viscosity of the alkali-activated solution and secondly, on the evolution of the viscosity of geopolymeric solution. Another aspect of this work is the determination of the effect of this percentage on the kinetics that characterize the start of the percolation phenomenon (transition from the fresh state to the hardened state). At last result concerns the impact of temperature on this transition. This contribution consolidates the control protocols for the formulation of geopolymers and allows the optimization of the processes of their exploitation.

Sodium activation solutions, geopolymer, metakaolin, setting time, rheological behavior, polynomial regression.