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. 2022 Feb 25;8(3):145. doi: 10.3390/gels8030145

Table 7.

The ratio of 3-day and 7-day compressive strength of different geopolymers to 28-day compressive strength.

Geopolymer	F_(3,7)/F₍₂₈₎	Na₂SiO₃ Modulus
Geopolymer	F_(3,7)/F₍₂₈₎	0.4	0.6	0.8	1.0	1.2	1.4
18% SS	F₃/F₂₈	0.41	0.51	0.57	0.65	0.21	0.04
18% SS	F₇/F₂₈	0.67	0.55	0.64	0.91	0.89	0.8
20% SS	F₃/F₂₈	0.51	0.64	0.57	0.55	0.40	0.28
20% SS	F₇/F₂₈	0.63	0.79	0.86	0.85	0.86	0.74
22% SS	F₃/F₂₈	0.54	0.60	0.57	0.49	0.49	0.5
22% SS	F₇/F₂₈	0.60	0.65	0.84	0.82	0.82	0.81

Note: F₃, F₇ and F₂₈ are 3 days, 7 days and 28 days compressive strength, respectively.