Reference : Re-alkalinization of carbonated concrete by means of alkaline migration
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
Re-alkalinization of carbonated concrete by means of alkaline migration
[fr] Réalcalinisation du béton carbonaté par migration des alcalins
Darimont, Anne mailto [Université de Liège - ULg > Département Argenco : Secteur GeMMe > Matériaux et maintenance en construction >]
Gilles, Pierre mailto [> >]
Dondonne, E. [> >]
Bulletin des Laboratoires des Ponts et Chaussées
avril mai juin
[en] bridge deck slab ; concrete carbonation ; thermonatrite ; trona ; trona
[fr] tablier de pont ; béton carbonaté ; thermonatrite
[en] In Belgium, a number of girder bridge deck slabs have over the past several years been displaying major degradations (delamination, disaggregation, etc.) capable, in time, of leading to slab perforation. This form of degradation, called "rotting of bridge deck slab concrete" is not uniformly distributed over the deck surface: deteriorated zones can be distinguished from intact zones and moreover are often associated with the presence of dark spots. On the lower surface of some such spots, the previously-carbonated concrete layer can sometimes once again display a pH of above 8.3. It will also be demonstrated that this anomaly may be attributed to a migration of alkaline through the concrete slab towards the lower surface, thereby causing a re-alkalinization of the carbonated layer and hence a rise in pH.

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