Research on Pure Modes I and II and Mixed-Mode (I/II) Fracture Toughness of Geopolymer Fiber-Reinforced Concrete

Table 1

Chemical composition of binders.

Oxide	Class F FA	GGBFS	SF
(TiO2, %)	0.1	—	—
(Na2O, %)	0.2	—	—
(K2O, %)	1.6	—	—
(MgO, %)	5.9	8.9	0.6
(CaO, %)	6.4	34.62	—
(Fe2O3, %)	9.8	1	0.3
(Al2O3, %)	25	17.2	0.6
(SiO2, %)	51	36.7	92.8
(LOI, %)	2.6	1.92	1.28