%0 Journal Article
%T VERIFICATION OF THE EFFECT OF CONCRETE SURFACE PROTECTION ON THE PERMEABILITY OF ACID GASES USING ACCELERATED CARBONATION DEPTH TEST IN AN ATMOSPHERE OF 98% CO2
%A MICHAL STEHL¨ªK
%A JI£¿¨ª NOV¨¢K
%J Ceramics-Silik¨¢ty
%D 2011
%I Academy of Sciences of the Czech Republic
%X Carbonation is one of the corrosion processes negatively influencing the properties of mature concrete. It is caused by a chemical reaction between carbon dioxide infiltrating the surface of a concrete structure and the minerals of the mastic cement. The surface of a concrete structure can be protected from the effects of atmospheric CO2 by coating with modern waterborne epoxy dispersions. Out of the four types of dispersions tested (dispersion A ¨C CHS Epoxy 200 V 55 + hardener Telalit 180, 2 layers; dispersion B ¨C DOW XZ 92 533 + hardener XZ 92 441.01, 2 layers; dispersion C ¨C CHS Epoxy 200 V 55 + hardener Telalit 180, 1st layer + Epostyl 217 V, 2nd layer; dispersion D ¨C Epostyl 217 V, 2 layers), the type A solvent-based epoxy dispersion and the type C combination of the solvent-based and the solvent-free emulsions demonstrated the highest degree of protection of cement mortar. The effect and actual protection time was evaluated by means of the  accelerated carbonation depth test in 98% CO2¡°.The correlation dependence found in the so-called ¡±accelerated test¡° enables us to determine intervals of real time in the natural environment of 0.03% CO2 corresponding to the intervals of accelerated exposition in 98% CO2. It may be said that in the case of type A, type B, type C and type D coatings on higher-quality concretes, the coating would have to be renewed with an interval of maximum eight years.
%K Carbonation of concrete
%K Epoxy dispersion
%K Diffusion
%K Phenolphthalein test
%K Concentrated 98% CO2
%U http://www.ceramics-silikaty.cz/2011/pdf/2011_01_79.pdf