8. Maintenance
8.1 Origin and nature of alterations
The main types of deterioration encountered in facing can be internal to the concrete (efflorescence, for example), environmental or human-induced.
A survey conducted by CERIB shows that the most frequently reported assaults are, in descending order:
graffiti (28%);
damage caused by various stains (20%);
mosses and mushrooms (20%);
dust (15%);
smoke and soot (8%);
acid rain (8%).
Most of these alterations can be treated either preventively (with water repellent, for example)...
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Maintenance
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