Concluding Remarks on Effectiveness and Durability of Surface Treatments

Concluding Remarks on Effectiveness and Durability of Surface Treatments 

The beneficial action of surface treatments generally hes in the fact that they prolong the period of initiation of corrosion. Once corrosion has begun, only those treatments that effectively obstruct the penetration of water, both hquid and vapour, will reduce the corrosion rate. This effect may be significant, in particular, if corrosion is due to carbonation [27]. Chloride-induced corrosion processes attract moisture so strongly that in general, surface treatments cannot stop it [13]. 

To reduce penetration by water and chloride ions, organic and cementitious coatings and hydrophobic treatments are used. In particular, the latter seem to be most 

Performance characteristics Test methods Substrate Environment SPS Requirement 

Capillary absorption/ permeability to water EN 1062-3 Porous clay or calcium silicate bricks, mortar XC3 XC4 G Absorp. coeff. iv 0.1 kg m. h  

---