Table 4: FTIR characteristic bands identified in the FA and RHA powders and brick specimens shown in Figure 8.

BandFA (cm−1)RHA (cm−1)P35U00 (cm−1)P35U10 (cm−1)P35U20 (cm−1)P35U30 (cm−1)P35U40 (cm−1)Characteristic bands

A3412344734643466346634663464O–H stretching (H2O) [24, 26, 27]
B1620161116921692169216921690O–H bending (H2O) [24, 26, 27]
C14621464146214621462Si–O/Al–O stretching [24, 26]
D1096109610781084108610881091Si–O/Al–O stretching [24, 27, 28]
E795791779779791791789Si–O–Si stretching quartz [26, 28]
F621619621619619619Zeolites [26, 28]
G459473465465469471471O–Si–O bending (SiO4) [24, 27, 28]