5. Glossary
Carbonation; Carbonation
Over time, the hydrates formed from the reaction of cement and water, in particular portlandite crystals (Ca(OH) 2 ), naturally carbonate on contact with atmospheric carbon dioxide dissolved in capillary water according to the carbonation reaction: Ca(OH) 2 + CO 2 ⇒ CaCO 3 + H 2 O.
Under ambient conditions of temperature and relative humidity, carbonation is governed by the transport of atmospheric CO 2 within capillary water. It begins at the extreme surface of the concrete and progresses towards the core of the material. Note that hydrated calcium...
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