Fig. 8
From: Influence of polar amino acids on the carbonation of lime mortars
FTIR spectra (wavenumber range 950–650 cm−1) of reference mortar specimen (Ref) and specimens with amino acid addition after 30 and 180 days (d) of curing. Circle symbols (●): characteristic calcite absorption bands at 873 cm−1 (ν2) and 713 cm−1 (ν4); diamond symbols (♦): characteristic aragonite absorption bands at 858 cm−1 (ν2) and 700 cm−1 (ν4)