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

Table 4

Fracture test results of nonfibrous and fibrous specimens.

Specimen Id	Loading angle (°)	Load (kN)	Fracture mode	The angle of crack initiation (°)	KIC(MPa.m^1/2)	KIIC(MPa.m^1/2)	Keff(MPa.m^1/2)	Standard deviation
GPC	0	11.23	I	0	0.26	0.00	0.26	0.03
	15	10.18	Mixed	20	−0.63	0.18	0.66	0.05
	28.83	10.55	II	32	0.00	0.45	0.45	0.03
	45	9.40	Mixed	48	−0.31	0.41	0.51	0.05
	60	11.35	Mixed	64	−0.61	0.35	0.70	0.02
	75	11.88	Mixed	80	−0.77	0.11	0.77	0.03
	90	17.85	I	89	−0.89	0.00	0.89	0.05
G-SPF	0	15.83	I	0	0.36	0.00	0.36	0.02
	15	14.23	Mixed	26	−0.46	0.63	0.77	0.01
	28.83	14.75	II	35	0.00	0.54	0.64	0.15
	45	13.53	Mixed	50	0.22	−0.33	0.40	0.3
	60	15.40	Mixed	65	−0.63	−0.63	0.89	0.35
	75	16.03	Mixed	83	−0.97	0.32	1.03	0.02
	90	21.98	I	88	−1.10	0.00	1.10	0.01
G-LPF	0	17.03	I	0	0.39	0.00	0.39	0.01
	15	15.48	Mixed	27	−0.91	−0.36	0.98	0.02
	28.83	16.00	II	38	0.00	0.44	0.44	0.05
	45	14.73	Mixed	48	−0.48	0.64	0.80	0.02
	60	16.55	Mixed	68	−0.84	−0.56	1.01	0.025
	75	17.18	Mixed	86	−0.93	0.52	1.07	0.01
	90	23.23	I	90	−1.16	0.00	1.16	0.02
G-SSF	0	26.10	I	0	0.60	0.00	0.60	0.03
	15	25.58	Mixed	20	−1.35	0.81	1.58	0.15
	28.83	24.38	II	35	0.00	0.90	0.90	0.10
	45	24.43	Mixed	50	0.39	−0.60	0.71	0.20
	60	25.75	Mixed	67	−1.15	0.99	1.52	0.20
	75	25.68	Mixed	83	−1.56	0.52	1.65	0.25
	90	26.28	I	89	−1.31	0.00	1.31	0.10
G-LSF	0	30.58	I	0	0.70	0.00	0.70	0.15
	15	28.93	Mixed	19	0.60	0.42	0.73	0.10
	28.83	28.18	II	42	0.00	0.88	0.88	0.05
	45	25.95	Mixed	49	−1.52	−0.63	1.65	0.20
	60	27.75	Mixed	64	−1.49	0.85	1.72	0.10
	75	28.20	Mixed	86	−1.53	0.85	1.75	0.15
	90	30.73	I	90	−1.54	0.00	1.54	0.25