Fig. 9
From: Influence of polar amino acids on the carbonation of lime mortars
XRD patterns (2θ range 25.5–33.5°) of reference mortar specimen (Ref) and specimens with amino acid addition after 30 and 180 days (d) of curing. Circle symbols (●): characteristic calcite diffraction peaks at 2θ = 29.4° (104); diamond symbols (♦): characteristic aragonite diffraction peaks at 2θ = 26.2° (111), 27.3° (021) and 33.1° (012); P: portlandite from uncarbonated lime; Q: quartz resulted from residual sand after sieving