Fig. 7

The variation of the carbonation rate versus hydration time under three environmental conditions during the first 8 h of hydration. The relative amount of carbonation was determined from the integrated area between 1,300 and 1,700 cm⁻¹, where the zero-level was set as a straight line between the endpoints of the integrated area. (a) Humid CO₂ atmosphere. (b) Exposure to ambient air for 19 days. (c) Humid N₂ atmosphere.