MAGNESIUM CEMENTS COMPRISING A PARTIALLY DESHYDRATED MAGNESIUM SALT AND A VERY REACTIVE MAGNESIA MAGNESIUM BINDERS WITH ACCELERATED GETTING AND IMPROVED WATER RESISTANCE OBTAINED FROM SUCH CEMENTS AND NON EXPANDED OR EXPANDED MATERIAL OBTAINED WITH SUCH.

摘要

This invention relates to magnesia cement. This magnesia cement includes a magnesium salt and magnesia, to which stabilising water is added. The magnesia salt is partially dehydrated, having a ratio preferably from 2 to 4, which is expressed as water molecules relative to each magnesia salt molecule. This cement is used to produce a hydraulic linked material, in which the relative proportions of magnesium salt, magnesia, and water, are defined by section No. 1, preferably from section No. 2 of the ternary diagram MgO-MgCl2-H2O of fig. 1, or from the section of ternary diagram MgO-MgSO4-H2O, as defined in fig. 2. This gives reduced hardening time (section No. 1 for oxychoride or oxysulphuric salt), as well as greater resistance to humidity (section No. 2 for linking, oxychloride salt materials.) Diagram fig. 1.