Ceramics-Silikáty 63, (2) 157 - 163 (2019)

Magnesium oxychloride cement (MOC) is a kind of pneumatic and hard cementitious material made by mixing magnesium oxide, magnesium chloride and water in certain proportions. The mixture proportion of the magnesium oxychloride cement materials is relatively complicated in a practical application. In this paper, through a physical property experiment on industrial bischofite in tap water, the constant difference of the mass percentage concentration and the Baumé degree of MgCl₂ were studied. The traditional design method was modified and a new simplified method of magnesium oxychloride cement material mixture was established. In order to verify the applicability of the new method, two kinds of MOC foam concretes have been prepared according to the proportions of the raw materials calculated by the traditional and new method, respectively. The performances of the two were analysed carefully, and the results exhibit that the two kinds of samples have similar mechanical properties and microstructures. It is indicated that the simplified process can be applied to the magnesium oxychloride cement material mixture and has important practical significance for the industrial production of magnesium oxychloride cement materials.