Table 2.

Description of FTIR spectra of K, MK, and MMK.

No.	Spectrum	Band cm-1	Band description	Structure	Refs.
1	Kaolin (K)	532	vibration of Al-O-Si octahedral	kaolinite	51
2		908	bending vibration of Al-O-H
3		1025	alternating stretching vibration of Si-O-Si and Al-O-Al
4		1105	asymmetric stretching vibration of Si-O-Si -
5		3618	vibration of internal OH groups -		57
6		3700	elongation vibration of edge OH groups
7		465	bending vibration of O-Si-O	quartz	53
8		683	symmetric stretching vibration of Si-O-Si
9		1610	bending vibration of HO-	adsorbed water	54
10		3407	stretching vibration of HO-
12	Metakaolin (MK)	459	bending vibration of O-Si-O	quartz	53
13		686	symmetric stretching vibration of Si-O-Si
14		1090	stretchingvibrationof Si-O (amorphous SiO2)	metakaolinite	55
15		1610	bending vibration of HO-	adsorbed water	54
16		3407	stretching vibration of HO-
17	ZnO- modified metakaolin (MMK)	459	bending vibration of O-Si-O	quartz	53
18		686	symmetric stretching vibration of Si-O-Si
19		1090	stretchingvibrationof Si-O (amorphous SiO2) -	metakaolinite	55
20		1610	bending vibration of HO	adsorbed water	54
21		3407	stretching vibration of HO-