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presented a very strong anti-symmetric stretching frequency of
sulphate ions (SO4 3) focused towards 1120 cm-1; This band is a manifestation of relative
isolation of this ion in the structure hexagonal prism. The water absorption band appeared in
1600-1700 cm-1 region (1640 and 1675 cm-1 2 H2O) and above 3000 cm-1 (3420 by 1
H2O and 3635 cm-1 from OHfree). The presence of the aluminate band is nearly 550 cm-1 (
AlO6) by Al-O stretching group, and 855 cm-1 (Al-OH bending). Figure 10 shows
the structure and infrared spectra of compounds ettringite.
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