Synthesis and Hardening of Fluoralinite Cement

The synthesis of fluoralinite cement and its hydration properties are presented. It was determined that fluoralinite is obtained after 4 hrs of burning at 1100 degrees C by using an initial composition of 0.89% Al2O3, 1.78% MgO, and 0.89% Fe2O3 additions. Specimens formed from fluoralinite clinker and ground sand (with a mass ratio of 1:3), hydrothermally cured at 175 degrees C for 4 hrs, had the highest strength (4.68 MPa). Thus, fluoralinite cement is usable for hydrothermal curing articles. X-Ray analysis showed that after hardening of the mixture of fluoralinite and quartz sand for 28 days in normal conditions, quartz, tobermorite gel, portlandite Ca(OH)(2), and CaF2 prevail in the samples. This mixture hardens in hydrothermal conditions, in calcium hydrosilicate (0.8-1.5)CaO center dot SiO2 center dot(0.5-2.5)H2O(C-S-H (I)) and Ca(OH)(2) forms.