Effect of Silica Fume on the Volume Expansion of Metakaolin-Based Geopolymer Considering the Silicon-to-Aluminum Molar Ratio

International Journal of Concrete Structures and Materials

Table 2 Mixing proportion of geopolymer specimens.

Specimen	Silica fume addition (%)	Precursor		Sodium silicate solution
		Metakaolin (wt%)	\(SF^{a}\) (wt%)	NaOH (wt%)	\(SF^{b}\) (wt%)	Water (wt%)	\(Mol^{c}\)
S/A 1.0	0	51	0	17	0	32	13.2
	5	49	2	17	0	32	12.7
	10	47	5	16	0	32	12.3
	15	45	8	15	0	32	11.9
S/A 1.4	0	43	0	15	10	32	11.3
	5	42	2	14	10	32	11.0
	10	41	4	14	9	32	10.7
	15	40	6	13	9	32	10.3
S/A 1.8	0	38	0	13	17	32	10.0
	5	37	2	13	16	32	9.7
	10	36	4	12	16	32	9.4
	15	35	6	12	15	32	9.2
S/A 2.0	0	36	0	13	19	32	9.4
	5	35	2	12	19	32	9.2
	10	34	3	12	19	32	8.9
	15	33	5	12	18	32	8.7

^aSilica fume was added into geopolymer in powder form, ^bSilica fume was used to synthesize sodium silicate solution, ^cThe molarity of sodium hydroxide solution.