ABSTRACT
As regards fig. 8, the resin forms a continuous microlayer and bridging the micropores of the concrete substratum and covering the cement crystals.
SEM studies are supported by mercury-porosimetry to measure even slight changes within the distribution of pore radii as a result of the treatment. Differences in pore volume are expressed as percentage over the distribution of pore radii and show a clear mark, which can be related to the effectiveness of the treatment. In the case of the sandstones, pore radii smaller than 5µm are clearly reduced, while there are no significant changes within the larger pore radii ranks. The large pore channels are still available for a gaseous transport of humidity through the treated volume of the stone or concrete /5/.
