Effects of GO/Al₂O₃ and Al₂O₃ Nanoparticles on Concrete Durability against High Temperature, Freeze-Thaw Cycles, and Acidic Environments

Figure 3

FT-IR spectra of GO (a) and GO/Al₂O₃. (b) Sharp peak in the 594 cm⁻¹ region corresponds to Al–O, which confirms the synthesis of Al₂O₃ (Figure 4).