. 2024 Nov 4;17(21):5387. doi: 10.3390/ma17215387

Table 7.

Fracture toughness K_IC of plain concrete specimens calculated by boundary effect model. The discrete parameters, β_fic for fictitious crack extension and β_ch for characteristic crack size, are taken as 1.0 and 2.0, respectively.

Specimen	Peak Load P_u (kN)	Initial Notch Size a₀ (mm)	α₀	Y(α₀)	a_e (mm)	f_t (MPa)	$K_{IC}$ ( $M P a \cdot \sqrt{m}$ )	σ_n (MPa)	a_e/a_fpz
JZ-W-2-1	24.81	20	0.1	0.93	8.98	4.91	2.19	4.52	0.18
JZ-W-2-2	24.06	20	0.1	0.93	8.98	4.76	2.13	4.38	0.18
JZ-W-2-3	23.12	20	0.1	0.93	8.98	4.57	2.05	4.21	0.18
JZ-W-2-4	25.59	20	0.1	0.93	8.98	5.06	2.26	4.66	0.18
JZ-W-2-5	24.04	20	0.1	0.93	8.98	4.76	2.13	4.38	0.18
JZ-W-2-6	24.34	20	0.1	0.93	8.98	4.81	2.15	4.43	0.18
WJ-1	21.66	20	0.1	0.93	8.98	4.29	1.92	3.95	0.18
WJ-2	27.11	20	0.1	0.93	8.98	5.36	2.40	4.93	0.18
WJ-3	28.77	20	0.1	0.93	8.98	5.69	2.54	5.24	0.18
WJ-4	28.31	20	0.1	0.93	8.98	5.60	2.50	5.15	0.18
WJ-5	33.39	20	0.1	0.93	8.98	6.60	2.95	6.07	0.18
WJ-6	21.99	20	0.1	0.93	8.98	4.35	1.95	4.01	0.18
JZ-W-4-1	20.16	40	0.2	0.91	10.77	4.99	2.23	4.53	0.22
JZ-W-4-2	20.06	40	0.2	0.91	10.77	4.97	2.22	4.51	0.22
JZ-W-4-3	17.31	40	0.2	0.91	10.77	4.29	1.92	3.89	0.22
JZ-W-4-4	16.57	40	0.2	0.91	10.77	4.11	1.84	3.73	0.22
JZ-W-6-1	12.21	60	0.3	0.95	10.40	3.82	1.71	3.48	0.21
JZ-W-6-2	12.07	60	0.3	0.95	10.40	3.78	1.69	3.44	0.21
JZ-W-6-4	13.14	60	0.3	0.95	10.40	4.11	1.84	3.74	0.21
JZ-W-8-2	11.76	80	0.4	1.07	9.48	4.77	2.13	4.37	0.19
JZ-W-8-3	11.55	80	0.4	1.07	9.48	4.68	2.09	4.29	0.19
JZ-W-8-4	8.74	80	0.4	1.07	9.48	3.56	1.59	3.26	0.19
JZ-W-10-1	7.03	100	0.5	1.30	8.37	3.87	1.73	3.58	0.17
JZ-W-10-2	7.95	100	0.5	1.30	8.37	4.36	1.95	4.04	0.17
JZ-W-10-3	9.04	100	0.5	1.30	8.37	4.95	2.22	4.59	0.17
JZ-W-10-4	9.83	100	0.5	1.30	8.37	5.38	2.41	4.98	0.17