Is concrete alkaline or acidic

Alkalinity - what is it?

Have you ever been to the swimming pool and thought about the pH value and alkalinity of the water? Probably not. It is important for the pool operator that both values ​​are correct. The alkalinity and pH value should not only be within a certain range in swimming pools, but also in the painting and plastering trade. We explain why.

What is alkalinity?

In general, the alkalinity denotes the Reaction of chemical compounds, substances or substances above the neutral point pH 7. The pH value is the measure of alkalinity and indicates how strongly basic or acidic a substance is. From a pH value of 7 we speak of alkaline substances. At values ​​that are close to the measurable end point pH 14, of strong alkalinity.

For example, a substance that has a high alkalinity is concrete. This property protects the steel inside the concrete from rusting. Over time, however, the alkalinity decreases and with it the protection against moisture, CO2 and acidic solutions. If external components are exposed to driving rain, for example, the steel often begins to rust on the surface.

Alkalinity and surface treatment

During your training in painting or plastering, you will work on a wide variety of surfaces with paints, varnishes or other coatings. Make sure to pay attention to the nature of the subsurface. If it is plaster, concrete or fiber cement, you should check it for the degree of alkalinity.
Painters or plasterers use an I for thisindicator paper or one Indicator solution. Depending on the discoloration, it can be seen whether the surface is acidic, neutral or alkaline.

Fluating prevents stains and discoloration

If you paint over mineral plasters, changes in the applied coating can occur due to the alkalinity. This is shown, for example, by Staining or Discoloration

You can prevent this by cleaning the alkaline surfaces through Fluate neutralize. Fluates ensure that the substrate hardens, its alkalinity disappears and the adhesive properties are improved.

Already knew?

Silicate paints are strongly alkaline and therefore corrosive. Therefore, you should always wear alkali-resistant protective clothing as well as protective goggles and protective gloves during processing. The high alkalinity and moisture-retaining properties of silicate paints also prevent the formation of mold.

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