Table 4: Carbonation depth measurements and standard deviations (mm).

MixtureDays of exposure at 4% CO2
153751112

0.8015.71.037.5
0.7013.71.624.21.437.5
0.6210.81.320.21.323.11.0n.d.
0.557.81.214.61.4n.d.22.31.3