Determination of carbon dioxide permeability
To protect concrete against carbonatation there are paints and other surface treatments that are to slow down permeation of carbon dioxide from the air. RISE offers testing according to EN 1062-6 “Paints and varnishes – Coating materials and coating systems for exterior masonry and concrete – Part 6: Determination of carbon dioxide permeability”. The method generates a value of the resistance against permeation expressed as diffusion equivalent air layer thickness (SD).
The product standard for surface protection for concrete EN 1504-2 ”Products and systems for the protection and repair of concrete structures – Definitions, requirements, quality control and evaluation of conformity – Part 2: Surface protection systems for concrete” states requirements on carbon dioxide permeation.
In the measurement method a carbon dioxide absorbing material is placed behind the test surface. The surface is then exposed to an artificial atmosphere with 10 % carbon dioxide. The absorbing material is weighed periodically. When an equilibrium is reached, i.e. when the weight increase per time is constant, the carbon dioxide resistance is calculated.
Often, the water vapor permeation according to EN 7783 is measured at the same time, as the methods are similar. RISE can help You out with this as well.