Elemental analyzes of ceramic samples over 1000 years old showed that the main chemical elements are, & # 37 ;: for samples: the outer part of the bricks: 24.45 Si; 14.31 Ca; 12.68 C; 11.55 Al; 5.60 Fe; 4.29K; the inside of the bricks: 32.23 Si; 17.66 Al; 12.66 Fe; 5.52K; 3.07 C; 1.36 Ti; 1.34 Ca; inclusions in bricks: 53.11 C; 13.40 Ca; 5.46 Si; 3.08 Al; 2.63 K; 1.78 Fe. It was determined by X-ray phase and electron microscopic methods of analysis that the strength properties of ceramic samples are given by mullite, anorthite and wollastonite. In addition, the presence of closed porosity in ceramic specimens with isometric and oval pores contributes to increased durability.
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