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The paper describes the use of methods of visualization and non-destructive investigation of spatial distribution of changes in the structure of the monitored material, which was a cement composite with admixture of blast furnace slag. The test specimens in the shape of the cylinders with a diameter of 24mm and a height of 25mm were placed in an aggressive sulfate environment represented by bacteria of the microorganism Acidithiobacillus thiooxidans for 6 months. To investigate the spatial distribution and the deg...