The key to the influence of alkaline environment on materials lies in the stability of their chemical composition. In this paper, the chemical composition of shale and sintered brick, their stability in alkaline environment and how to increase the service life of buildings will be discussed in depth.

Black shale

Black shale is rich in organic matter and iron sulfide, and the organic matter content is as high as 3- 10%. This unique composition makes black shale a special existence.

carbonaceous shale

Carbonaceous shale contains a lot of carbonized organic matter, which seems to be a work of art in nature.

oil shale

Oil shale contains more than 10% kerogen, which is the hometown of oil.

Siliceous shale

The main components of siliceous shale are chalcedony, opal and so on. The content of silicon dioxide is above 85%.

Iron shale

Iron shale contains a small amount of iron oxides and hydroxides, showing a unique red or grayish green color.

calcareous shale

The main component of calcareous shale is CaCO3, but it does not exceed 25%.

glass block

The main chemical composition of common sintered brick and shale brick is the same, both of which are SiO2. The stability of silicon dioxide endows it with certain corrosion resistance.

chemical reaction

In the environment of strong alkali and strong acid, other 10%~ 18% components in shale brick and sintered brick will rapidly differentiate, resulting in the disappearance of brick hardness, and even can be ground into powder by hand.

Extend the service life

If you plan to use these materials in bathrooms or chemical sites, it is recommended to use a certain proportion of waterproof mortar for plastering to increase the service life of the building. Of course, using other special materials would be a better choice.