Fracture Surface Fractal Characteristics of Alkali-Slag Concrete under Freeze-Thaw Cycles

Table 2

Results of experiments and fracture surface fractal dimension under freeze-thaw cycles.

Number	Freeze-thaw cycle times	Dimension; D	Correlation coefficient	Fracture toughness; (MPa⋅m^1/2)	Compressive strength; (MPa)	Flexural strength; (MPa)
A1	0	2.10	0.9624	6.65	67.4	7.06
	50	2.10	0.9432	5.51	67.1	6.86
	100	2.11	0.9527	4.84	64.7	6.71
	150	2.13	0.9365	4.19	64.0	6.36
	200	2.15	0.9255	3.36	62.0	6.00
	250	2.17	0.9736	2.74	59.2	5.58
	300	2.20	0.9718	2.41	55.5	5.10
A2	0	2.11	0.9367	6.79	67.6	7.15
	50	2.12	0.9284	6.18	67.3	6.94
	100	2.12	0.9273	5.42	64.9	6.80
	150	2.14	0.9198	4.70	64.2	6.44
	200	2.16	0.9324	3.77	62.2	6.08
	250	2.19	0.9563	3.08	59.4	5.65
	300	2.21	0.9497	2.70	55.7	5.16
A3	0	2.11	0.9564	6.84	67.8	7.24
	50	2.12	0.9275	6.36	67.5	7.03
	100	2.13	0.9389	5.57	65.1	6.88
	150	2.15	0.9567	4.45	64.3	6.52
	200	2.16	0.9657	3.72	62.2	6.15
	250	2.18	0.9481	3.03	59.5	5.67
	300	2.21	0.9219	2.66	55.9	5.15
A4	0	2.13	0.9728	8.55	68.0	7.74
	50	2.13	0.9658	7.95	67.7	7.52
	100	2.15	0.9290	6.96	65.3	7.36
	150	2.16	0.9309	5.57	64.6	6.97
	200	2.18	0.9482	4.65	62.5	6.58
	250	2.20	0.9193	3.80	59.7	6.07
	300	2.22	0.9571	3.32	55.9	5.58
A5	0	2.14	0.9674	10.75	69.9	7.91
	50	2.15	0.9329	10.25	69.6	7.68
	100	2.16	0.9198	9.03	67.2	7.52
	150	2.17	0.9437	7.50	66.4	7.13
	200	2.19	0.9522	6.17	64.3	6.72
	250	2.21	0.9346	5.14	61.5	6.25
	300	2.23	0.9633	4.27	57.6	5.77