Sorel Cements from Tunisian Natural Brines

Abstract

In this chapter, the experimental design methodology is applied to optimize the forma- tion conditions of magnesium chloride cement. A factorial design to model and to optimize the operating parameters that govern the formation was used. The studied factors were mass ratio of MgCl 2 .6H 2 O/MgO, mixing time and stirring speed. The considered responses were compressive strength and setting time. The optimum operating condi tions were quite efficient to have a good compressive strength and suitable setting time. The phases’ compositions of the magnesium oxychloride cement were evaluated by X-ray diffraction, the morphological properties were examined by scanning electron micros - copy (SEM) method and their thermal behavior was analyzed by differential thermal analysis/thermogravimetric analysis (DTA/TGA). The raw materials used in the study were magnesium oxide and magnesium chloride hexahydrate obtained from natural brines in the south of Tunisia.