Abstract
In order to develop the compositions of ceramic bricks, the influence of phosphoric slag on the properties of Langer clay is investigated in this work. Phosphoric slag in the amount of 20, 30 and 40 percent was added to Hungarian clay and standard samples-cylinders were prepared. The samples were fired at temperatures of 1000, 1100 and 1150 оС. When determining the properties of the fired samples, the influence of the amount of phosphoric slag and the value of the firing temperature was observed. Experimentally, the average density of samples subjected to firing at an optimal temperature was 1870-2100 kg/m3, and the compressive strength according to the test results was 24.3 - 29.89 MPa. A sample with the addition of 30% phosphoric slag and obtained by firing at a temperature of 1100 оC is considered optimal.